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Quasiparticle phono-conversion: filming carriers coalescing into excitons

T0 review · 2 major / 4 minor · reviewed 2026-07-31 · grok-4.5

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Pith's one-line read Free electrons and holes in monolayer WSe2 bind into excitons through phonon emission, and tr-ARPES catches them coexisting while spectral weight transfers in about a picosecond.

desk verdict Real tr-ARPES coexistence of free carriers and excitons on a ~1 ps scale, with a phonon-cascade XBE match that mostly holds at the stated density. read the letter →

arxiv 2607.28417 v1 pith:4RDU5HJE submitted 2026-07-30 cond-mat.mtrl-sci

Enrico Perfetto , Takumi Fukuda , Xing Zhu , Jacques Hawecker , Harley Suchiang , Joanna Nadolna , Nanami Tomoda , Suji Park
show 7 more authors
Houk Jang Kenji Watanabe Takashi Taniguchi Michael K. L. Man Julien Madéo Keshav M. Dani Gianluca Stefanucci
This is my paper
classification cond-mat.mtrl-sci PACS 78.67.-n71.35.-y79.60.-i63.20.kd
keywords excitonformationtr-ARPESmonolayerWSe2phonon-mediatedscatteringexcitonicBlochequationsdarkexcitons2Dsemiconductorsvalleymultiplicity
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

When light pumps monolayer WSe2 well above the gap, hot free carriers cool to the band edges and then form bound excitons. Cooling itself is familiar; the binding step is not, because energy and momentum must be shed in a constrained cascade. With high-resolution time- and momentum-resolved photoemission, the authors watch free-carrier conduction-band signal and lower-energy excitonic sidebands occupy the spectrum at the same time, then watch weight move from the former to the latter within roughly one picosecond. First-principles excitonic Bloch equations that allow only phonon-mediated electron–hole scattering reproduce the same coexistence and transfer, so the paper attributes the binding to phonon-assisted coalescence—a sequential cascade into the lowest excitonic states with intermediate states kept sparsely occupied. Valley multiplicity, large-momentum phonons, and spin flips set how efficiently that cascade runs. If the account is right, devices that need free carriers or excitons can be timed and engineered around this phonon-controlled conversion window.

What carries the argument

Phono-conversion via the excitonic Bloch equations (XBE): occupations of free electron–hole pairs and bound excitons evolve under phonon emission and absorption only, converting continuum pairs into discrete excitonic branches and thereby generating the calculated time-resolved ARPES spectra that match experiment.

What would settle it

Repeat the same low-fluence tr-ARPES experiment while deliberately raising density toward the Mott threshold, or disable large-momentum and spin-flip phonon channels in the XBE: if coexistence and the ~1 ps weight transfer survive when phonons are suppressed or collapse only when Coulomb channels are restored, the phonon-dominance claim fails.

Watch

Extended reading notes

Core claim

Non-resonant above-gap excitation of monolayer WSe2 produces a transient coexistence of free-carrier conduction-band photoemission and in-gap excitonic sidebands, with spectral weight transferring from free carriers to excitons on a sub-picosecond to ~1 ps scale. First-principles excitonic Bloch equations that include only phonon-mediated scattering reproduce this dynamics and establish phonon-assisted coalescence (phono-conversion) via a cascade into the lowest excitonic states—with weakly populated intermediates—as the dominant formation pathway at the studied density.

Load-bearing premise

Agreement with phonon-only simulations at low carrier density is taken to prove that phonons—not residual Coulomb or Auger scattering—drive the observed binding.

Editorial extensions

If this is right

  • Exciton formation after above-gap pumping is a multi-timescale phonon cascade (~300 fs free-carrier cooling, up to ~1 ps binding, ~2 ps exciton relaxation), not an instantaneous Coulomb collapse.
  • Transient free-carrier and exciton bands can be read separately in high-resolution tr-ARPES, so hot-carrier extraction windows before binding become directly measurable.
  • Valley multiplicity, large-momentum phonon emission, and spin-flip scattering control which dark and bright exciton valleys fill and how fast.
  • Optical materials and valleytronic devices can be designed to favor free carriers or excitons by engineering phonon phase space and valley structure.

Reading between the lines

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

  • Substrate or encapsulation choices that reshape the phonon spectrum or dielectric screening should shift the free-carrier-to-exciton conversion time in a predictable, tr-ARPES-testable way.
  • The same coexistence signature should appear in other monolayer TMDs with dense dark-exciton manifolds; materials with fewer valleys or weaker intervalley phonons should show slower or incomplete phono-conversion.
  • If intermediate excitonic states stay dark in ARPES because they are sparsely occupied, resonant probes tuned to those intermediates could still catch the cascade steps the photoemission sidebands miss.
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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

2 major / 4 minor

Summary. The manuscript reports time- and momentum-resolved ARPES on monolayer WSe2 under non-resonant above-gap excitation, combined with first-principles excitonic Bloch equations (XBE). With ~88 meV energy resolution, the experiment resolves a transient coexistence of free-carrier conduction-band signal and lower-energy excitonic sidebands at K and Q, with spectral-weight transfer on a ~1 ps scale and subsequent exciton relaxation. Negative exciton dispersion, two-peak EDCs, and lineshape asymmetry are documented. XBE simulations that retain only phonon-mediated electron–hole scattering reproduce the coexistence, weight transfer, K/Q energetics, EDC asymmetry (from Mx≈2mv), and delayed growth of spin-antialigned excitons, and are used to argue that exciton formation proceeds by a phonon cascade into lowest-lying states with weakly populated intermediates (phono-conversion), controlled by valley multiplicity, large-momentum phonons, and spin flips.

Significance. If the result holds, this is a substantial advance: prior optical work inferred free-carrier/exciton conversion only indirectly, and earlier tr-ARPES lacked the resolution or analysis to establish dynamical coexistence. The combination of high-resolution delay series (Fig. 2d), quantitative EDC decomposition (Fig. 3, Extended Data Fig. 2), and nontrivial spectral fingerprints matched by a first-principles dynamical framework (XBE) makes the observation and the low-density phonon-cascade picture highly credible. Strengths include independent experimental evidence not fitted to the target claim, falsifiable theory fingerprints (mass-imbalance asymmetry; delayed spin-dark population in Extended Data Fig. 7), and clear device-relevant timescales for hot-carrier extraction versus exciton formation. The named “phono-conversion” pathway and the engineering implications are well motivated by the data.

major comments (2)
  1. [Main text after Fig. 2; Methods] Main text after Fig. 2 and Methods: the claim that theory–experiment agreement “unequivocally establishes” phonons as the dominant formation channel rests on XBE that omit Coulomb carrier–carrier and Auger scattering, justified by the low density (~3.2×10^11 cm^-2). That density is plausibly below Mott, and the observation of coexistence stands independently; however, “unequivocally” overstates the mechanistic exclusion. Please soften the language and add an explicit discussion of residual Coulomb/Auger contributions and how they would (or would not) alter the same weight-transfer signature at this density.
  2. [Methods; Fig. 3 caption] Methods (First-principle simulations): the continuum BSE sector is replaced by free e–h pairs E≈εc−εv with diagonal amplitudes, truncated to 200 bands / ten bound branches, and the simulation pump is ~2.4 eV versus experiment 3.1 eV (noted as causing a small onset discrepancy in Fig. 3). These choices are load-bearing for the cascade and bottleneck narrative. Please quantify sensitivity of the coexistence window and intermediate-state populations to continuum truncation and to pump excess energy, or show that the qualitative cascade picture is robust under reasonable variations.
minor comments (4)
  1. [Fig. 3d; Methods] Fig. 3d: theory population traces are multiplied by an ad-hoc exponential with τ≈2 ps for recombination. State this more prominently in the main text when comparing timescales, so readers do not read the long-time decay as a pure XBE prediction.
  2. [Extended Data Fig. 2; Data analysis] Extended Data Fig. 2: the two-Gaussian plus asymmetric-least-squares background procedure is central to the free-carrier vs exciton populations. A brief robustness check (window size, alternative backgrounds) in the SI would strengthen confidence in the extracted ~300 fs / ~1 ps / ~2 ps scales.
  3. [Throughout; Methods] Typographical inconsistencies: “colascence” → “coalescence”; “lineraly” → “linearly”; “weas integrated” → “was integrated”; author list “Mad´ eo” formatting. Unify E−EVBM labeling across figures.
  4. [Abstract; Introduction; Extended Data Fig. 1] Abstract/Introduction claim “unprecedented energy resolution”: the 88 meV FWHM is clearly better than the cited prior 1L-WSe2 ARPES, but a one-sentence comparison to the best published values would make the claim precise rather than rhetorical.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: independent tr-ARPES coexistence observation compared to parameter-free XBE dynamics from ab initio e-ph rates

full rationale

The load-bearing empirical claim—the transient coexistence of free-carrier CB signal and lower-energy excitonic sidebands with ~1 ps spectral-weight transfer—is read directly from new tr-ARPES delay series, two-Gaussian EDCs, and negative exciton dispersion; it is not derived from the theory. The XBE (and the ARPES exciton-replica formula) are cited from the authors’ prior methodological papers, but they enter as a dynamical framework: occupations N_λQ are evolved from microscopic phonon-mediated rates built on BSE states, ab initio bands, phonons, and e-ph matrix elements, then mapped to I_k(τ,ε). No parameter is fitted to the coexistence or weight-transfer data and then re-presented as a prediction; the only auxiliary factor is an external ~2 ps recombination damping from the literature applied after the fact to total intensity. Neglect of Coulomb/Auger channels is an explicit modeling assumption justified by low density, not a self-definitional reduction. Agreement between independent experiment and first-principles simulation is ordinary corroboration, not circularity. Score 0; steps empty.

Assumptions & free parameters 4 free parameters · 6 assumptions · 1 invented entities

The claim rests on standard many-body and ARPES machinery (BSE excitons, e-ph rates, photoemission from excitonic populations) plus domain choices that phonon-only XBE at low density captures the dynamics, continuum truncations, and a few hand-set simulation knobs (pump energy, broadening η, 2 ps damping). No new particles or forces are invented; 'phono-conversion' names the observed phonon-mediated pathway. Free parameters are limited and mostly numerical/experimental controls rather than fits that define the result.

free parameters (4)
  • Simulation pump central energy (~2.4 eV vs exp 3.1 eV) = ~2.4 eV (exp 3.1 eV)
    Methods state a lower photon energy in calculations than experiment; authors attribute a small onset discrepancy in exciton populations to this choice.
  • Recombination damping lifetime on theory population traces = τ≈2 ps
    Fig. 3d multiplies all simulated curves by exp(-t/τ) with τ≈2 ps from literature [51] to match long-time decay; not predicted by the XBE run itself.
  • ARPES energy broadening η in theory spectra = 0.01–0.05 eV
    η=0.01 eV used to resolve sideband dispersion in Fig. 2e; η=0.05 eV for EDC comparison in Fig. 4; chosen for visual/quantitative match to resolution.
  • Photoexcited density / pump intensity in simulation = ~10^11 cm^-2
    Set to ~10^11 cm^-2 to stay in low-density excitonic regime comparable to exp 3.2×10^11 cm^-2; controls linearity and neglect of Auger/carrier-carrier terms.
assumptions (6)
  • domain assumption Exciton and free e-h dynamics after non-resonant pump are described by the first-principles excitonic Bloch equations with coherent/incoherent decomposition and irreducible e-h auxiliaries.
    Methods Eqs. (1)–(2); framework from authors' SciPost 2025 paper [32], taken as the correct nonequilibrium generator.
  • domain assumption At the experimental density, Coulomb carrier-carrier scattering and Auger processes can be neglected relative to phonon-mediated conversion.
    Stated explicitly after Fig. 2; underpins the claim that theory–experiment agreement proves phononic origin.
  • domain assumption tr-ARPES intensity from excitons is proportional to N_λQ with energy ε_v,k-Q + E_λQ (photoemission matrix elements neglected).
    Methods ARPES formula and citations [40–43]; standard in this subfield but an idealization.
  • ad hoc to paper Continuum BSE eigenstates may be replaced by free e-h pairs E≈ε_c−ε_v with diagonal amplitudes, retaining 200 bands to 2.7 eV.
    Methods truncation paragraph; computational necessity that could affect early hot-carrier cascade details.
  • ad hoc to paper Bound excitonic subspace truncated to the ten lowest BSE branches; electronic subspace to two VB and two CB.
    Methods; assumes higher excitons stay weakly populated as claimed in the cascade picture.
  • domain assumption Standard BSE with static HSEX screening and DFT-level bands/phonons/e-ph matrix elements adequately locate exciton energies and couplings in 1L-WSe2.
    Methods and Refs. [25,41]; common first-principles stack for TMD excitons.
invented entities (1)
  • Phono-conversion (named pathway) independent evidence
    purpose: Label the phonon-mediated coalescence of free e-h pairs into bound excitons as distinct from resonant photo-generation.
    Terminological framing of a mechanism built from standard e-ph scattering and BSE excitons; not a new quasiparticle or interaction. Independent evidence is the reported tr-ARPES coexistence itself.

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Pith. "Pith review of Quasiparticle phono-conversion: filming carriers coalescing into excitons." pith.science (2026). https://pith.science/paper/4RDU5HJE

@misc{pith2026260728417,
  author       = {Pith},
  title        = {Pith review of: Quasiparticle phono-conversion: filming carriers coalescing into excitons},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/4RDU5HJE}},
  note         = {Machine review of arXiv:2607.28417}
}
abstract

Condensed matter physics is replete with phenomena involving high-energy free particles coalescing into low-energy bound few-particle states. While the cooling of the individual particles is well understood, the crucial step by which cold free carriers form a bound state remains elusive, involving complex energy and momentum relaxation pathways. Here, by combining ultrafast time- and momentum-resolved photoemission spectroscopy on a monolayer WSe$_2$ with the first-principles excitonic-Bloch equations, we resolve the conversion of initially free electrons and holes at the bandedges into bound excitons. With unprecedented energy resolution, we observe the transient \textit{coexistence} of free-carrier and excitonic bands, accompanied by a transfer of spectral weight between the two. We establish the phononic origin of exciton formation and ascribe this coexistence to a sequential relaxation cascade toward the lowest-energy excitonic states, wherein intermediate states remain weakly populated. The efficiency of this process is controlled by valley multiplicity, large-momentum phonon emission and spin-flip processes. By elucidating how bound states emerge from their elementary constituents, our results point to strategies for engineering exciton formation, with direct implications for optical materials and devices that operate with excitons or free carriers.

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Works this paper leans on

54 extracted references · 24 canonical work pages

  1. [1]

    Mourzidis, K. et al. Exciton formation in two-dimensional semiconduc- tors. Phys. Rev. X15, 031078 (2025). URL https://link.aps.org/doi/10.1103/ 66rj-jbqw

    2025

  2. [2]

    Kumar, R. et al. Exciton formation and relaxation dynamics in quantum wires. Phys. Rev. Lett.81, 2578–2581 (1998). URL https://link.aps.org/doi/10.1103/ PhysRevLett.81.2578

    1998

  3. [3]

    Szczytko, J. et al. Determination of the exciton formation in quantum wells from time-resolved interband luminescence. Phys. Rev. Lett.93, 137401 (2004). URL https://link.aps.org/doi/10.1103/PhysRevLett.93.137401

    work page doi:10.1103/physrevlett.93.137401 2004

  4. [4]

    and Selig, Malte and Yao, Kaiyuan and Borrego-Varillas, Rocio and Scotognella, Francesco and Kriegel, Ilka and Yan, Aiming and Zettl, Alex and Schuck, P

    Trovatello, Chiara and Katsch, Florian and Borys, Nicholas J. and Selig, Malte and Yao, Kaiyuan and Borrego-Varillas, Rocio and Scotognella, Francesco and Kriegel, Ilka and Yan, Aiming and Zettl, Alex and Schuck, P. James and Knorr, Andreas and Cerullo, Giulio and Dal Conte, Stefano. The ultrafast onset of 24 exciton formation in 2D semiconductors. Nature...

    2020

  5. [5]

    Damen, T. C. et al. Dynamics of exciton formation and relaxation in gaas quan- tum wells. Phys. Rev. B42, 7434–7438 (1990). URL https://link.aps.org/doi/ 10.1103/PhysRevB.42.7434

    work page doi:10.1103/physrevb.42.7434 1990

  6. [6]

    Ceballos, F., Cui, Q., Bellus, M. Z. & Zhao, H. Exciton formation in monolayer transition metal dichalcogenides. Nanoscale8, 11681–11688 (2016). URL http: //dx.doi.org/10.1039/C6NR02516A

    doi:10.1039/c6nr02516a 2016

  7. [7]

    Steinleitner, P. et al. Direct observation of ultrafast exciton formation in a mono- layer of wse2. Nano Letters17, 1455–1460 (2017). URL https://doi.org/10.1021/ acs.nanolett.6b04422

    2017

  8. [8]

    Eroglu, Z. E. et al. Ultrafast dynamics of exciton formation and decay in two- dimensional tungsten disulfide (2d-ws2) monolayers. Phys. Chem. Chem. Phys. 22, 17385–17393 (2020). URL http://dx.doi.org/10.1039/D0CP03220D

    work page doi:10.1039/d0cp03220d 2020

Show all 54 references
  1. [9]

    W., Kira, M., Khitrova, G

    Koch, S. W., Kira, M., Khitrova, G. & Gibbs, H. M. Semiconductor excitons in new light. Nature Materials5, 523–531 (2006). URL https://doi.org/10.1038/ nmat1658

    2006

  2. [10]

    Wang, G. et al. Colloquium: Excitons in atomically thin transition metal dichalco- genides. Rev. Mod. Phys.90, 021001 (2018). URL https://link.aps.org/doi/10. 1103/RevModPhys.90.021001

    2018

  3. [11]

    P., Yao, W., Shan, J

    Wilson, N. P., Yao, W., Shan, J. & Xu, X. Excitons and emergent quantum phenomena in stacked 2d semiconductors. Nature599, 383–392 (2021). URL https://doi.org/10.1038/s41586-021-03979-1

    2021 doi

  4. [12]

    & Plochocka, P

    Baranowski, M. & Plochocka, P. Excitons in metal-halide perovskites. Advanced Energy Materials10, 1903659 (2020). URL https://advanced. onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201903659

    2020 doi

  5. [13]

    Nonequilibrium many-body theory of optical nonlinearities of semi- conductors

    Haug, H. Nonequilibrium many-body theory of optical nonlinearities of semi- conductors. Journal of Luminescence30, 171–187 (1985). URL https://www. sciencedirect.com/science/article/pii/0022231385900511

    1985

  6. [14]

    Schmitt-Rink, S., Chemla, D. S. & Haug, H. Nonequilibrium theory of the optical stark effect and spectral hole burning in semiconductors. Phys. Rev. B37, 941– 955 (1988). URL https://link.aps.org/doi/10.1103/PhysRevB.37.941

    1988 doi

  7. [15]

    & Stefanucci, G

    Perfetto, E., Sangalli, D., Marini, A. & Stefanucci, G. Pump-driven normal-to- excitonic insulator transition: Josephson oscillations and signatures of BEC-BCS crossover in time-resolved ARPES. Phys. Rev. Materials3, 124601 (2019). URL https://link.aps.org/doi/10.1103/PhysRevM...

    2019 doi

  8. [16]

    Excitons and carriers in transient absorption and time-resolved arpes spectroscopy: An ab initio approach

    Sangalli, D. Excitons and carriers in transient absorption and time-resolved arpes spectroscopy: An ab initio approach. Phys. Rev. Mater.5, 083803 (2021). URL https://link.aps.org/doi/10.1103/PhysRevMaterials.5.083803

    2021 doi

  9. [17]

    Rivera, P. et al. Valley-polarized exciton dynamics in a 2d semiconductor het- erostructure. Science351, 688–691 (2016). URL https://www.science.org/doi/ abs/10.1126/science.aac7820

    2016 doi

  10. [18]

    Inverted valley polarization in optically excited transition metal dichalcogenides

    Bergh¨ auser, G.et al. Inverted valley polarization in optically excited transition metal dichalcogenides. Nature Communications9, 971 (2018). URL https://doi. org/10.1038/s41467-018-03354-1

    2018 doi

  11. [19]

    Y., da Jornada, F

    Chan, Y.-H., Qiu, D. Y., da Jornada, F. H. & Louie, S. G. Giant self-driven exciton-floquet signatures in time-resolved photoemission spectroscopy of mos¡sub¿2¡/sub¿ from time-dependent gw approach. Proceedings of the National Academy of Sciences120, e2301957120 (2023). URL ht...

    2023 doi

  12. [20]

    Pareek, V. et al. Driving floquet physics with excitonic fields. Nature Physics (2026). URL https://doi.org/10.1038/s41567-025-03132-z

    2026 doi

  13. [21]

    & Stefanucci, G

    Perfetto, E. & Stefanucci, G. Floquet topological phase of nondrivenp-wave nonequilibrium excitonic insulators. Phys. Rev. Lett.125, 106401 (2020). URL https://link.aps.org/doi/10.1103/PhysRevLett.125.106401

    2020 doi

  14. [22]

    Directly visualizing the momentum-forbidden dark excitons and their dynamics in atomically thin semiconductors

    Mad´ eo, J.et al. Directly visualizing the momentum-forbidden dark excitons and their dynamics in atomically thin semiconductors. Science370, 1199–1204 (2020). URL https://www.science.org/doi/abs/10.1126/science.aba1029

    2020 doi

  15. [23]

    Wallauer, R. et al. Momentum-resolved observation of exciton formation dynam- ics in monolayer ws2. Nano Letters21, 5867–5873 (2021). URL https://doi.org/ 10.1021/acs.nanolett.1c01839. PMID: 34165994

    2021 doi

  16. [24]

    Nonequilibrium lattice dynamics in monolayer mos2

    Caruso, F. Nonequilibrium lattice dynamics in monolayer mos2. The Journal of Physical Chemistry Letters12, 1734–1740 (2021). URL https://doi.org/10.1021/acs.jpclett.0c03616

    2021 doi

  17. [25]

    & Stefanucci, G

    Perfetto, E. & Stefanucci, G. Real-time GW-Ehrenfest-Fan-Migdal method for nonequilibrium 2d materials. Nano Letters23, 7029–7036 (2023). URL https: //doi.org/10.1021/acs.nanolett.3c01772

    2023 doi

  18. [26]

    Siantidis, K., Axt, V. M. & Kuhn, T. Dynamics of exciton formation for near band-gap excitations. Phys. Rev. B65, 035303 (2001). URL https://link.aps. org/doi/10.1103/PhysRevB.65.035303

    2001 doi

  19. [27]

    Caruso, F. et al. The 2025 roadmap to ultrafast dynamics: frontiers of theoretical and computational modeling. Journal of Physics: Materials9, 012501 (2025). 26 URL https://doi.org/10.1088/2515-7639/ae1165

    2025 doi

  20. [28]

    Cha, S. et al. 1s-intraexcitonic dynamics in monolayer mos2 probed by ultrafast mid-infrared spectroscopy. Nature Communications7, 10768 (2016). URL https: //doi.org/10.1038/ncomms10768

    2016 doi

  21. [29]

    A., H¨ agele, D., Carnahan, M

    Kaindl, R. A., H¨ agele, D., Carnahan, M. A. & Chemla, D. S. Transient terahertz spectroscopy of excitons and unbound carriers in quasi-two-dimensional electron- hole gases. Phys. Rev. B79, 045320 (2009). URL https://link.aps.org/doi/10. 1103/PhysRevB.79.045320

    2009

  22. [30]

    M´ enard, J. M.et al. Revealing the dark side of a bright exciton–polariton con- densate. Nature Communications5, 4648 (2014). URL https://doi.org/10.1038/ ncomms5648

    2014

  23. [31]

    Gosetti, V. et al. Unveiling exciton formation: exploring the early stages in time, energy and momentum domain. arXiv preprint arXiv:2412.02507 (2024)

    2024 arXiv

  24. [32]

    & Perfetto, E

    Stefanucci, G. & Perfetto, E. Excitonic Bloch equations from first principles. SciPost Phys.18, 009 (2025). URL https://scipost.org/10.21468/SciPostPhys. 18.1.009

    2025 doi

  25. [33]

    & Thygesen, K

    Deilmann, T. & Thygesen, K. S. Finite-momentum exciton landscape in mono- and bilayer transition metal dichalcogenides.2D Materials6, 035003 (2019). URL https://dx.doi.org/10.1088/2053-1583/ab0e1d

    2019 doi

  26. [34]

    M., Rigosi, A

    Chernikov, A., Ruppert, C., Hill, H. M., Rigosi, A. F. & Heinz, T. F. Popula- tion inversion and giant bandgap renormalization in atomically thin WS 2 layers. Nature Photonics9, 466–470 (2015)

    2015

  27. [35]

    Steinhoff, A. et al. Exciton fission in monolayer transition metal dichalcogenide semiconductors. Nat. Commun.8, 1166 (2017). URL https://doi.org/10.1038/ s41467-017-01298-6

    2017

  28. [36]

    Dendzik, M. et al. Observation of an excitonic mott transition through ultrafast core-cum-conduction photoemission spectroscopy. Phys. Rev. Lett.125, 096401 (2020). URL https://link.aps.org/doi/10.1103/PhysRevLett.125.096401

    2020 doi

  29. [37]

    Mad´ eo, J. et al. Directly visualizing the momentum forbidden dark excitons and their dynamics in atomically thin semiconductors. arXiv preprint arXiv:2005.00241 (2020)

    2005 arXiv

  30. [38]

    Man, M. K. L. et al. Experimental measurement of the intrinsic excitonic wave function. Science Advances7, eabg0192 (2021). URL https://www.science.org/ doi/abs/10.1126/sciadv.abg0192. 27

    2021 doi

  31. [39]

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

    2021 doi

  32. [40]

    & Stefanucci, G

    Perfetto, E., Sangalli, D., Marini, A. & Stefanucci, G. First-principles approach to excitons in time-resolved and angle-resolved photoemission spectra. Phys. Rev. B 94, 245303 (2016). URL https://link.aps.org/doi/10.1103/PhysRevB.94.245303

    2016 doi

  33. [41]

    & Perfetto, E

    Stefanucci, G. & Perfetto, E. Unified first-principles formula for time-resolved arpes spectra of coherent and incoherent excitons (2026). URL https://arxiv. org/abs/2601.16786. 2601.16786

    2026

  34. [42]

    & Kemper, A

    Rustagi, A. & Kemper, A. F. Photoemission signature of excitons. Phys. Rev. B 97, 235310 (2018). URL https://link.aps.org/doi/10.1103/PhysRevB.97.235310

    2018 doi

  35. [43]

    & Bernardi, M

    Chen, H.-Y., Sangalli, D. & Bernardi, M. Exciton-phonon interaction and relax- ation times from first principles. Phys. Rev. Lett.125, 107401 (2020). URL https://link.aps.org/doi/10.1103/PhysRevLett.125.107401

    2020 doi

  36. [44]

    & Stefanucci, G

    Perfetto, E., Bianchi, S. & Stefanucci, G. Time-resolved arpes spectra of nonequi- librium excitonic insulators: Revealing macroscopic coherence with ultrashort pulses. Phys. Rev. B101, 041201 (2020). URL https://link.aps.org/doi/10.1103/ PhysRevB.101.041201

    2020

  37. [45]

    & Knorr, A

    Christiansen, D., Selig, M., Malic, E., Ernstorfer, R. & Knorr, A. Theory of exciton dynamics in time-resolved arpes: Intra- and intervalley scattering in two- dimensional semiconductors. Phys. Rev. B100, 205401 (2019). URL https:// link.aps.org/doi/10.1103/PhysRevB.100.205401

    2019 doi

  38. [46]

    & Malic, E

    Brem, S., Selig, M., Berghaeuser, G. & Malic, E. Exciton relaxation cascade in two-dimensional transition metal dichalcogenides. Scientific Reports8, 8238 (2018). URL https://doi.org/10.1038/s41598-018-25906-7

    2018 doi

  39. [47]

    & Bernardi, M

    Chen, H.-Y., Sangalli, D. & Bernardi, M. First-principles ultrafast exciton dynamics and time-domain spectroscopies: Dark-exciton mediated valley depo- larization in monolayer wse 2. Phys. Rev. Res.4, 043203 (2022). URL https: //link.aps.org/doi/10.1103/PhysRevResearch.4.043203

    2022 doi

  40. [48]

    Lin, K.-Q. et al. Narrow-band high-lying excitons with negative-mass electrons in monolayer wse2. Nature Communications12, 5500 (2021). URL https://doi. org/10.1038/s41467-021-25499-2

    2021 doi

  41. [49]

    Corrigendum: k.p theory for two-dimensional transition metal dichalcogenide semiconductors (2015 2d mater

    Korm´ anyos, A.et al. Corrigendum: k.p theory for two-dimensional transition metal dichalcogenide semiconductors (2015 2d mater. 2 022001). 2D Materials2, 049501 (2015). URL https://dx.doi.org/10.1088/2053-1583/2/4/049501. 28

    2015 doi

  42. [50]

    Shih, Y.-C., Nilsson, F. A. & Guo, G.-Y. Electron energy loss spectra and exciton band structure of wse 2 monolayers studied by ab initio bethe-salpeter equation calculations. Phys. Rev. B110, 205417 (2024). URL https://link.aps.org/doi/ 10.1103/PhysRevB.110.205417

    2024 doi

  43. [51]

    Robert, C. et al. Exciton radiative lifetime in transition metal dichalcogenide monolayers. Phys. Rev. B93, 205423 (2016). URL https://link.aps.org/doi/10. 1103/PhysRevB.93.205423

    2016

  44. [52]

    & Marini, A

    Paleari, F. & Marini, A. Exciton-phonon interaction calls for a revision of the “exciton” concept. Phys. Rev. B106, 125403 (2022). URL https://link.aps.org/ doi/10.1103/PhysRevB.106.125403

    2022 doi

  45. [53]

    & Louie, S

    Antonius, G. & Louie, S. G. Theory of exciton-phonon coupling. Phys. Rev. B 105, 085111 (2022). URL https://link.aps.org/doi/10.1103/PhysRevB.105. 085111

    2022 doi

  46. [54]

    & Cao, T

    Zhang, X.-W. & Cao, T. Ab initio calculations of spin-nonconserving exciton–phonon scattering in monolayer transition metal dichalcogenides. Journal of Physics: Condensed Matter34, 264002 (2022). URL https://dx.doi. org/10.1088/1361-648X/ac6649. 29

    2022 doi

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