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REVIEW 3 major objections 5 minor 46 references

Light-induced trion-exciton competition revealed by ultrafast photoemission

T0 review · 3 major / 5 minor · reviewed 2026-08-03 · deepseek-v4-flash

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Pith's one-line read In undoped Ta2NiS5, optical excitation alone creates a mixed population of trions and excitons, with trions forming via a single-particle channel that needs no photoexcited hole.

desk verdict Real fluence-dependent in-gap state in undoped Ta2NiS5, but the trion/exciton decomposition and single-particle pathway are model-generated, not directly measured. read the letter →

arxiv 2512.22523 v2 pith:CNBIN346 submitted 2025-12-27 cond-mat.str-el

Ittai Sidilkover , Nir Hen Levin , Yuval Nitzav , Shiri Gvishi , Abigail Dishi , Shaked Rosenstein , Noam Ophir , Irena Feldman
show 6 more authors
Andrei Varykhalov Naaman Amer Amit Kanigel Anna Keselman Iliya Esin Hadas Soifer
This is my paper
classification cond-mat.str-el
keywords trionsexcitonstrARPESTa2NiS5quasi-one-dimensionalultrafastdynamicsrateequationsCoulombcorrelations
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper reports that pumping pristine, undoped Ta2NiS5 with an ultrafast near-infrared pulse produces a bright, momentum-localized state inside the band gap, which the authors identify as a mixture of excitons and trions (charged excitons). The key claim is that trions—conventionally thought to require charge doping—are generated here purely optically, through a direct single-particle pathway in which a conduction electron binds to a virtual exciton. A rate-equation model with just two rates captures the fluence-dependent decay, showing that trions dominate the late-time relaxation while excitons dominate early at high fluence. If correct, this establishes that charged many-body bound states can be created and controlled by light alone in a correlated quasi-one-dimensional semiconductor, opening a new route to manipulate neutral and charged quasiparticles on ultrafast timescales.

What carries the argument

The central mechanism is a pair of coupled rate equations for conduction electrons, holes, excitons, and trions, reduced to two effective rates: alpha_1p for all single-particle processes (trion creation and exciton decay) and alpha_2p for two-particle processes (exciton creation and trion decay). The model assumes the measured in-gap intensity is proportional to the sum of trion and exciton populations, n_T + n_X, and exploits the symmetry that the two channels have equal rates. The energetics of Ta2NiS5—total trion binding energy exceeding the band gap—is what enables the single-particle trion-creation pathway and is taken from prior work, not recalculated here.

What would settle it

Measure the trion and exciton contributions independently, for example by tuning the probe energy or using a momentum microscope to resolve the few-meV difference in photoemission kinetic energy between the two species, or by varying the pump wavelength to suppress the single-particle channel: if the late-time decay becomes fluence-independent or the feature splits into two resolvable peaks, the single-peak, two-species interpretation would be falsified.

Watch

Extended reading notes

Core claim

The paper shows that in Ta2NiS5, a quasi-one-dimensional correlated semiconductor, photoexcitation of undoped samples generates a transient in-gap quasiparticle feature that reaches maximum intensity about 400 fs after the pump pulse and decays over ~2 ps. By combining time- and angle-resolved photoemission (trARPES) with coupled rate equations, the authors identify this feature as a superposition of excitons and trions. The trions are formed through an unconventional single-particle mechanism: a conduction-band electron binds directly to a virtual exciton, without requiring an intermediate electron-hole binding step. This is energetically possible because the total trion binding energy exce

Load-bearing premise

The in-gap photoemission feature is a bound quasiparticle whose total measured intensity is proportional to the sum of trion and exciton populations, and the trion/exciton decomposition is not directly measured but instead emerges from rate equations that already contain the single-particle trion channel.

Editorial extensions

If this is right

  • Trions can be created purely optically in an undoped bulk semiconductor, eliminating the need for external charge doping and suggesting a general route to light-controlled charged excitations.
  • Pump fluence provides a tunable knob: low fluence produces a trion-dominated nonequilibrium state, while high fluence initially favors excitons, allowing controlled studies of mixed charged/neutral quasiparticle populations.
  • The trion decay channel necessarily generates two excitons per trion, implying that trion recombination cascades into exciton populations and shapes the late-time photophysics.
  • The success of the two-rate model in both undoped and surface-doped samples unifies transient and equilibrium trions, suggesting that light-induced and doping-induced trions are the same quasiparticle species.
  • Time-resolved photoemission can resolve charged many-body bound states, not just neutral excitons, in bulk correlated materials.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Beyond the paper: if this single-particle trion channel is generic to materials with total trion binding energy exceeding the band gap, it would predict that optical pumping alone can drive trion formation in other quasi-one-dimensional and strongly correlated semiconductors, a testable extension to materials like Ta2NiSe5 or TaSe3.
  • Beyond the paper: the fluence-dependent trion/exciton ratio implies an optical switch between charge-neutral and charged quasiparticle populations; one could probe this with time-resolved, momentum-resolved electron energy-loss or photoemission of the two-exciton decay products.
  • Beyond the paper: the decomposition into trions and excitons is purely derived from the rate-equation structure; a direct spectral measurement at higher probe energy or lower temperature might resolve the small binding-energy difference and independently verify the fractions.
  • Beyond the paper: the slow downward drift of the feature's center energy (attributed to screening changes) suggests that the trion/exciton mixture itself renormalizes the electronic structure, which could be observed as a fluence-dependent shift in the valence band or in the equilibrium trion dispersion.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper reports time- and angle-resolved photoemission (trARPES) measurements on undoped Ta2NiS5 following 800 nm optical excitation. The authors observe a bright, momentum-localized in-gap feature (QPF) that appears on a ~400 fs timescale and decays over ~2 ps. Based on a comparison of its effective mass (~3 me) with equilibrium trions from a companion study (ref. 17), and on a fluence-dependent rate-equation analysis, they conclude that the QPF is a mixture of excitons and trions, with trions formed via an unconventional 'single-particle' pathway that does not require a photoexcited hole. The rate equations (Eq. 1) include a linear trion-creation term (C_T n_e), and the trion/exciton populations are extracted by fitting the total QPF intensity (A·σ) to n_X(t)+n_T(t) at three pump fluences. The paper further claims that the trion-to-exciton ratio is controlled by fluence, with trions dominating at late times, and that an exciton-only model fails to capture the dynamics.

Significance. If the identification is correct, the work is significant: it would demonstrate transient trions in an undoped, strongly correlated quasi-1D semiconductor and establish trARPES as a probe of charged many-body quasiparticles. The experimental data are of high quality: the time-mapping analysis (Fig. 2) and the fluence series (Fig. 3) are well presented, and the authors are explicit about the model assumptions. The paper also ships a quantitative rate-equation framework and compares against the exciton-only model, which is a useful negative control. The central claim, however, depends on model-based decomposition of a spectrally unresolved feature, and the single-particle trion channel is inserted by assumption rather than discriminated from alternatives. The significance would be substantially enhanced by a test that does not presuppose the existence of the single-particle pathway.

major comments (3)
  1. [§3 (Eq. 1), Fig. 3C–D] The central claim that trions form via a single-particle pathway without a photoexcited hole is not established by the data. The observable used for fitting is the total QPF intensity, assumed proportional to n_X+n_T, yet the model in Eq. (1) already includes the linear trion-creation term C_T n_e and the symmetric assignment C_T=R_X, C_X=R_T. The decomposition into n_T(t) and n_X(t) is therefore generated by a model that contains the conclusion. The exciton-only model (fig. S3) rules out a model with no trions at all, but it does not test the key alternative: conventional trion formation via exciton-plus-electron capture, which would require a photoexcited hole. A fit of that alternative model (e.g., with a term proportional to n_X n_e or n_e^2 n_h) to the same data is necessary to substantiate the 'no-hole pathway' claim.
  2. [§3, Table S1] The fluence dependence of the rates undermines the claim that the model predicts composition from measured dynamics without fluence information. The extracted rates vary strongly with fluence: α_1p^{-1} goes from 446±74 fs (490 μJ/cm²) to 175±14 fs (50 μJ/cm²), and α_2p^{-1} from 350±60 fs to 833±69 fs. Because all fits use identical initial conditions (n_e(0)=n_h(0)=1 by normalization), the three fluences are not distinguished by the source term; the fluence dependence is absorbed entirely into per-fluence fitted rates. The statement 'the model is not supplied a priori with fluence information' is thus misleading. Moreover, the abstract's claim that 'the same model with unchanged rates reproduces the full dynamics' in surface-doped samples is inconsistent with Table S1, where rates change by more than a factor of two across the pristine-fluence series.
  3. [§4 (Fig. 4D), §2] The identification of the QPF as a bound trion/exciton mixture is not fully compelling because alternative origins of the in-gap feature are not ruled out. The increased Gaussian width (69 meV vs 46 meV) is attributed to 'the unavoidable presence of excitons,' but a phonon sideband, a surface/defect state, or a hot-carrier relaxation artifact could produce a broad, momentum-localized, slowly decaying feature with fluence-dependent dynamics. The comparison to equilibrium trions via effective mass (fig. S1) is suggestive, but the peak separation expected between trions and excitons is tens of meV, comparable to the 69 meV width, so the feature is spectrally unresolved. The paper should explicitly discuss and, where possible, exclude these alternative interpretations, or present an independent discriminator.
minor comments (5)
  1. [Throughout] The abbreviation 'QPF' (quasiparticle feature) is used, but the supplementary occasionally writes 'QFP'; please unify.
  2. [SM, Rate Equations] In the derivation of C_T, C_X, R_X, R_T (Eqs. S12–S15), the paper states that 'geometric overlap factors are typically of order unity,' which justifies C_T=R_X and C_X=R_T. This is a qualitative estimate; the systematic uncertainty in this equality should be quantified or at least discussed as a limitation.
  3. [SM, fig. S1 caption] The caption has two items labeled '(A)'; the second should be labeled '(B)' or renumbered.
  4. [SM, first paragraph] The phrase 'TaNiS5' should be 'Ta2NiS5'.
  5. [§3, Fig. 3B] The intensity curves are normalized to their peak and have background subtracted. This normalization removes absolute fluence information; please state explicitly in the text or caption that the fits therefore use only the shape of the normalized decay, not the absolute quasiparticle density.

Circularity Check

2 steps flagged · score 6.0 of 10

The trion/exciton decomposition and the single-particle no-hole trion pathway are outputs of a rate-equation model in which that pathway is assumed; the in-gap feature is spectrally unresolved and the conventional trion channel is excluded by construction.

  1. fitted input called prediction [Eq. (1) and Fig. 3C-D]
    "We fit this model to data at three fluences to extract the two rates for each case (34) (Fig. 3C-D). Panel C compares the experimentally integrated QPF intensity (34) (black) with the fitted total quasiparticle population, n_T(t)+n_X(t) (gray), demonstrating excellent agreement. The individual trion and exciton populations (n_T,n_X) are shown in purple and green ... Signals from excitons and trions are therefore expected at different energies; however, the difference ... is on the order of tens of meV, comparable to the observed QPF width, which hinders their spectral separation."

    The only quantity fit to the data is the total intensity of a feature whose exciton and trion components the paper admits cannot be spectrally separated. The individual populations n_T(t) and n_X(t) are not measured; they are state variables obtained by integrating Eq. (1), a model that already contains the single-particle trion formation term C_T n_e. The reported trion/exciton composition and late-time trion dominance are therefore forced by the assumed rate-equation structure rather than independently established by the data. Fitting the unresolved total does not test whether the in-gap feature is a mixed trion population at all.

  2. self definitional [Text immediately following Eq. (1)]
    "We restrict the model to single-photon processes and neglect higher-order contributions (like the aforementioned secondary trion creation)."

    The paper's central mechanistic claim is that trions form via 'an unconventional single-particle pathway that requires no photoexcited hole.' To establish that, the model must discriminate this pathway from the conventional trion channel, in which an exciton captures an additional conduction electron (a process that does require a photoexcited hole). That alternative is explicitly omitted from Eq. (1). Thus the no-hole pathway is an input assumption of the fitted model, not a data-derived result; the data are never shown to be incompatible with the omitted conventional channel.

full rationale

The raw trARPES observation is not circular: the bright, momentum-localized in-gap feature, its delayed buildup, long decay, and fluence-dependent dynamics are new measurements, and the paper does test an exciton-only version of the model (fig. S3) and finds it inadequate. The effective-mass comparison to equilibrium trions (ref. 17) is also external evidence. However, the two central claims that go beyond the raw observation—the trion/exciton composition and the single-particle, no-hole trion pathway—are not independently measured. The paper states that the trion and exciton signals are separated by only tens of meV, comparable to the observed 69 meV QPF width, so the two states are not spectrally resolved. The only fitted observable is the total QPF intensity, assumed proportional to n_X+n_T. The decomposition into n_T and n_X is generated by integrating Eq. (1), which already contains the C_T n_e single-particle trion formation term. Conventional secondary trion formation (exciton + electron capture) is explicitly neglected, so the data are never confronted with the standard hole-requiring pathway. Thus the unconventional mechanism is an input to the fitting model rather than a consequence of the data. The self-citation to ref. 17 supplies the equilibrium-trion identification and the binding-energy condition used to justify the pathway; because it is a separate, externally checkable result, I do not count that self-citation as a separate circular step, but it does not cure the model-dependence of the dynamical composition.

Assumptions & free parameters 2 free parameters · 5 assumptions · 0 invented entities

No new particles or forces are invented; trions and excitons are established entities. The main extra load is carried by fitted rates and by the assumption that a single unresolved spectral feature can be decomposed into two species through the rate equations.

free parameters (2)
  • alpha_1p (single-particle rate, equated with C_T and R_X) = 2.24-5.63 ps^-1 depending on fluence (Table S1)
    Fitted to the QPF integrated intensity for each fluence; the equality C_T = R_X is an assumption used to reduce the model.
  • alpha_2p (two-particle rate, equated with C_X and R_T) = 1.2-2.86 ps^-1 depending on fluence (Table S1)
    Fitted to the QPF integrated intensity for each fluence; the equality C_X = R_T is an assumption based on similar attractive interactions.
assumptions (5)
  • domain assumption Total trion binding energy E_X^bin + E_X-e^bin exceeds the single-particle band gap in Ta2NiS5
    Taken from ref. 17 (overlapping authors); it is load-bearing for the claimed direct, no-hole trion formation pathway.
  • ad hoc to paper The measured QPF intensity (A*sigma from Gaussian EDC fit) is proportional to the total quasiparticle population n_X + n_T
    Needed to fit the rate-equation output to the data; unequal exciton/trion photoemission cross-sections would break the proportionality.
  • ad hoc to paper C_T = R_X and C_X = R_T based on comparable electron-phonon matrix elements
    The supplement derives proportionality of each rate to coupling constants, but the equality is a simplifying assumption, not a quantitative result.
  • domain assumption Photoemission from an exciton leaves a VB hole; photoemission from a trion leaves a bound exciton, with energy shifts E_X^bin and E_X-e^bin
    Standard trARPES identification imported from refs. 35-37 and used in Fig. 2F to assign the QPF energy.
  • domain assumption Excited carriers are described by mean populations n_e, n_h, n_X, n_T in simple rate equations with no momentum or coherence dependence
    The whole reaction scheme in Eq. (1) assumes a spatially homogeneous, incoherent population dynamics.

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Cite this review

Pith. "Pith review of Light-induced trion-exciton competition revealed by ultrafast photoemission." pith.science (2026). https://pith.science/paper/CNBIN346

@misc{pith2026251222523,
  author       = {Pith},
  title        = {Pith review of: Light-induced trion-exciton competition revealed by ultrafast photoemission},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/CNBIN346}},
  note         = {Machine review of arXiv:2512.22523}
}
abstract

Strong Coulomb interactions in low-dimensional quantum materials give rise to emergent bound states such as excitons and trions. Trions are conventionally secondary excitations, requiring both optical excitation and charge doping. In quasi-one-dimensional Ta$_2$NiS$_5$, however, an exceptionally large binding energy exceeding the single-particle band gap stabilizes an equilibrium trion gas under surface doping alone. Here, using time- and angle-resolved photoemission spectroscopy, we show that trions can also be generated purely optically, without external charge. Following photoexcitation of pristine Ta$_2$NiS$_5$ we observe a bright, momentum-localized, in-gap feature with a slow, fluence-dependent relaxation. Rate-equation modeling identifies it as a mixed population of trions and excitons, with the trions formed via an unconventional single-particle pathway that requires no photoexcited hole. The trion-exciton composition is controlled by pump fluence, with trions dominating the late-time relaxation. In surface doped samples, the same model with unchanged rates reproduces the full dynamics, linking the light-induced trions to their equilibrium counterparts through pump-induced dissociation and recapture. These results establish trARPES as a direct probe of charged quasiparticles far from equilibrium and open routes to optical control of neutral and charged excitations in correlated materials.

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Works this paper leans on

46 extracted references · 2 linked inside Pith

  1. [1]

    G. H. Wannier, The Structure of Electronic Excitation Levels in Insulating Crystals.Physical Review52(3), 191–197 (1937), publisher: American Physical Society

    1937

  2. [2]

    G. D. Scholes, G. Rumbles, Excitons in nanoscale systems.Nature Materials5(9), 683–696 (2006), publisher: Nature Publishing Group

    2006

  3. [3]

    S. B. Anantharaman, K. Jo, D. Jariwala, Exciton–Photonics: From Fundamental Science to Applications.ACS Nano15(8), 12628–12654 (2021), publisher: American Chemical Society

    2021

  4. [4]

    J ´erome, T

    D. J ´erome, T. M. Rice, W. Kohn, Excitonic Insulator.Physical Review158(2), 462–475 (1967), publisher: American Physical Society

    1967

  5. [5]

    Kaneko, Y

    T. Kaneko, Y. Ohta, A New Era of Excitonic Insulators.Journal of the Physical Society of Japan94(1), 012001 (2025), publisher: The Physical Society of Japan

    2025

  6. [6]

    Kune ˇs, Excitonic condensation in systems of strongly correlated electrons.Journal of Physics: Condensed Matter27(33), 333201 (2015), publisher: IOP Publishing

    J. Kune ˇs, Excitonic condensation in systems of strongly correlated electrons.Journal of Physics: Condensed Matter27(33), 333201 (2015), publisher: IOP Publishing

    2015

  7. [7]

    I. V. Bondarev, Relative stability of excitonic complexes in quasi-one-dimensional semicon- ductors.Physical Review B90(24), 245430 (2014), publisher: American Physical Society

    2014

  8. [8]

    J. A. Sobota, Y. He, Z.-X. Shen, Angle-resolved photoemission studies of quantum materials. Rev. Mod. Phys.93(2), 025006 (2021)

    2021

Show all 46 references
  1. [9]

    Gedik, I

    N. Gedik, I. Vishik, Photoemission of quantum materials.Nature Physics13(11), 1029–1033 (2017), publisher: Nature Publishing Group

    2017

  2. [10]

    S. Smolenski,et al., Large exciton binding energy in a bulk van der Waals magnet from quasi- 1D electronic localization.Nature Communications16(1), 1134 (2025), publisher: Nature Publishing Group

    2025

  3. [11]

    J. Ma, M. Shi, Angle resolved photoemission spectroscopy study of excitons in quantum materials.Science China Physics, Mechanics & Astronomy68(8), 287001 (2025). 14

    2025

  4. [12]

    M. Liebich,et al., Controlling Coulomb correlations and fine structure of quasi-one- dimensional excitons by magnetic order.Nature Materials24(3), 384–390 (2025), publisher: Nature Publishing Group

    2025

  5. [13]

    Klein,et al., The Bulk van der Waals Layered Magnet CrSBr is a Quasi-1D Material.ACS Nano17(6), 5316–5328 (2023), publisher: American Chemical Society

    J. Klein,et al., The Bulk van der Waals Layered Magnet CrSBr is a Quasi-1D Material.ACS Nano17(6), 5316–5328 (2023), publisher: American Chemical Society

    2023

  6. [14]

    Ma,et al., Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3.Nature Materials21(4), 423–429 (2022), publisher: Nature Publishing Group

    J. Ma,et al., Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3.Nature Materials21(4), 423–429 (2022), publisher: Nature Publishing Group

    2022

  7. [15]

    Huang,et al., Evidence for an Excitonic Insulator State in Ta 2Pd3Te5.Physical Review X 14(1), 011046 (2024), publisher: American Physical Society

    J. Huang,et al., Evidence for an Excitonic Insulator State in Ta 2Pd3Te5.Physical Review X 14(1), 011046 (2024), publisher: American Physical Society

    2024

  8. [16]

    P. Zhang,et al., Spontaneous Gap Opening and Potential Excitonic States in an Ideal Dirac Semimetal Ta2Pd3Te5.Physical Review X14(1), 011047 (2024), publisher: American Physical Society

    2024

  9. [17]

    Nitzav,et al., Trion gas on the surface of a failed excitonic insulator (2025), arXiv:2511.23084 [cond-mat]

    Y. Nitzav,et al., Trion gas on the surface of a failed excitonic insulator (2025), arXiv:2511.23084 [cond-mat]

    2025 arXiv

  10. [18]

    Boschini, M

    F. Boschini, M. Zonno, A. Damascelli, Time-resolved ARPES studies of quantum materials. Reviews of Modern Physics96(1), 015003 (2024), publisher: American Physical Society

    2024

  11. [19]

    Reutzel, G

    M. Reutzel, G. S. M. Jansen, S. Mathias, Probing excitons with time-resolved momentum microscopy.Advances in Physics: X9(1), 2378722 (2024), publisher: Taylor & Francis eprint: https://doi.org/10.1080/23746149.2024.2378722

    2024

  12. [20]

    J. Mad ´eo,et al., Directly visualizing the momentum-forbidden dark excitons and their dy- namics in atomically thin semiconductors.Science370(6521), 1199–1204 (2020), publisher: American Association for the Advancement of Science

    2020

  13. [21]

    S. Dong,et al., Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function.Natural Sciences1(1), e10010 (2021), eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/ntls.10010. 15

    2021 doi

  14. [22]

    Gosetti,et al., Unveiling the exciton formation in time, energy and momentum domain in layered van der Waals semiconductors.Progress in Surface Science100(2), 100777 (2025)

    V. Gosetti,et al., Unveiling the exciton formation in time, energy and momentum domain in layered van der Waals semiconductors.Progress in Surface Science100(2), 100777 (2025)

    2025

  15. [23]

    Karni, I

    O. Karni, I. Esin, K. M. Dani, Through the Lens of a Momentum Microscope: Viewing Light-Induced Quantum Phenomena in 2D Materials.Advanced Materials35(27), 2204120 (2023)

    2023

  16. [24]

    Tanimura, K

    H. Tanimura, K. Tanimura, J. Kanasaki, Surface exciton formation on InP(110)-1×1 studied by time- and angle-resolved photoemission spectroscopy.Physical Review B107(7), 075304 (2023), publisher: American Physical Society

    2023

  17. [25]

    Mori,et al., Spin-polarized spatially indirect excitons in a topological insulator.Nature 614(7947), 249–255 (2023), publisher: Nature Publishing Group

    R. Mori,et al., Spin-polarized spatially indirect excitons in a topological insulator.Nature 614(7947), 249–255 (2023), publisher: Nature Publishing Group

    2023

  18. [26]

    R. Mori,et al., Possible evidence of excitonic condensation in a topological insulator.Pro- ceedings of the National Academy of Sciences122(18), e2422667122 (2025), publisher: Proceedings of the National Academy of Sciences

    2025

  19. [27]

    A. Kunin,et al., Momentum-Resolved Exciton Coupling and Valley Polarization Dynamics in Monolayer WS 2.Physical Review Letters130(4), 046202 (2023), publisher: American Physical Society

    2023

  20. [28]

    Christiansen, M

    D. Christiansen, M. Selig, E. Malic, R. Ernstorfer, A. Knorr, Theory of exciton dynamics in time-resolved ARPES: Intra- and intervalley scattering in two-dimensional semiconductors. Physical Review B100(20), 205401 (2019), publisher: American Physical Society

    2019

  21. [29]

    Karni,et al., Structure of the moir´e exciton captured by imaging its electron and hole.Nature 603(7900), 247–252 (2022), publisher: Nature Publishing Group

    O. Karni,et al., Structure of the moir´e exciton captured by imaging its electron and hole.Nature 603(7900), 247–252 (2022), publisher: Nature Publishing Group

    2022

  22. [30]

    Wakisaka,et al., Excitonic Insulator State in Ta 2NiSe5 Probed by Photoemission Spec- troscopy.Physical Review Letters103(2), 026402 (2009), publisher: American Physical Soci- ety

    Y. Wakisaka,et al., Excitonic Insulator State in Ta 2NiSe5 Probed by Photoemission Spec- troscopy.Physical Review Letters103(2), 026402 (2009), publisher: American Physical Soci- ety

    2009

  23. [31]

    Baldini,et al., The spontaneous symmetry breaking in Ta 2NiSe5 is structural in nature

    E. Baldini,et al., The spontaneous symmetry breaking in Ta 2NiSe5 is structural in nature. Proceedings of the National Academy of Sciences120(17), e2221688120 (2023), publisher: Proceedings of the National Academy of Sciences. 16

    2023

  24. [32]

    Chen,et al., Anomalous excitonic phase diagram in band-gap-tuned Ta 2Ni(Se,S)5.Nature Communications14(1), 7512 (2023), publisher: Nature Publishing Group

    C. Chen,et al., Anomalous excitonic phase diagram in band-gap-tuned Ta 2Ni(Se,S)5.Nature Communications14(1), 7512 (2023), publisher: Nature Publishing Group

    2023

  25. [33]

    Soifer,et al., Band-Resolved Imaging of Photocurrent in a Topological Insulator.Physical Review Letters122(16), 167401 (2019), publisher: American Physical Society

    H. Soifer,et al., Band-Resolved Imaging of Photocurrent in a Topological Insulator.Physical Review Letters122(16), 167401 (2019), publisher: American Physical Society

    2019

  26. [34]

    Materials and methods are available as supplementary material

  27. [35]

    J. Wu, Z. H. Withers, T. K. Allison, D. Y. Qiu, What is the signature of a trion in photoemission? (2025), arXiv:2511.19280 [cond-mat]

    2025

  28. [36]

    Meneghini,et al., ARPES signatures of trions in van der Waals materials (2025), arXiv:2511.11448 [cond-mat]

    G. Meneghini,et al., ARPES signatures of trions in van der Waals materials (2025), arXiv:2511.11448 [cond-mat]

    2025 arXiv

  29. [37]

    Rustagi, A

    A. Rustagi, A. F. Kemper, Photoemission signature of excitons.Physical Review B97(23), 235310 (2018), publisher: American Physical Society

    2018

  30. [38]

    Trovatello,et al., The ultrafast onset of exciton formation in 2D semiconductors.Nature Communications11(1), 5277 (2020), publisher: Nature Publishing Group

    C. Trovatello,et al., The ultrafast onset of exciton formation in 2D semiconductors.Nature Communications11(1), 5277 (2020), publisher: Nature Publishing Group

    2020

  31. [39]

    J. Katoch,et al., Giant spin-splitting and gap renormalization driven by trions in single- layer WS2/h-BN heterostructures.Nature Physics14(4), 355–359 (2018), publisher: Nature Publishing Group

    2018

  32. [40]

    K. F. Mak,et al., Tightly bound trions in monolayer MoS 2.Nature Materials12(3), 207–211 (2013), publisher: Nature Publishing Group

    2013

  33. [41]

    Nakama, M

    K. Nakama, M. Okada, R. Kitaura, H. Kishida, T. Koyama, Trion formation in monolayer MoS2 observed via femtosecond time-resolved photoluminescence measurements.Physical Review B110(23), 235412 (2024)

    2024

  34. [42]

    P. X. Nguyen,et al., An equilibrium trion liquid in atomic double layers.Science390(6770), 304–307 (2025), publisher: American Association for the Advancement of Science

    2025

  35. [43]

    J. P. Bange,et al., Probing electron-hole Coulomb correlations in the exciton landscape of a twisted semiconductor heterostructure.Science Advances10(6), eadi1323 (2024), publisher: American Association for the Advancement of Science. 17

    2024

  36. [44]

    K. Volckaert,et al., External screening and lifetime of exciton population in single-layer ReSe2 probed by time- and angle-resolved photoemission spectroscopy.Physical Review Materials 7(4), L041001 (2023), publisher: American Physical Society

    2023

  37. [45]

    Pfau,et al., Low work function in the 122-family of iron-based superconductors.Physical Review Materials4(3), 034801 (2020), publisher: American Physical Society

    H. Pfau,et al., Low work function in the 122-family of iron-based superconductors.Physical Review Materials4(3), 034801 (2020), publisher: American Physical Society

    2020

  38. [46]

    Gauthier,et al., Expanding the momentum field of view in angle-resolved photoemission systems with hemispherical analyzers.Review of Scientific Instruments92(12), 123907 (2021)

    N. Gauthier,et al., Expanding the momentum field of view in angle-resolved photoemission systems with hemispherical analyzers.Review of Scientific Instruments92(12), 123907 (2021). Acknowledgments We thank Roni Ilan and Tobias Holder for fruitful discussions. We thank Helmholt...

    2021

Pith tools

Reviewed August 3, 2026 · model on record in the stance chip above.