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Femtosecond photocurrents by the Dresselhaus bulk spin-galvanic effect in an inversion-asymmetric ferromagnet

T0 review · 2 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read Femtosecond light pulses on NiMnSb produce a charge current assigned to the bulk Dresselhaus spin-galvanic effect.

desk verdict First ultrafast observation of a Dresselhaus-symmetry photocurrent in a bulk ferromagnet, with a solid symmetry analysis but a mechanism assignment that is indirect and needs a thickness series. read the letter →

arxiv 2507.00360 v1 pith:TAB7F33L submitted 2025-07-01 cond-mat.mtrl-sci cond-mat.mes-hallphysics.optics

Junwei Tong , Zdenek Kaspar , Afnan Alostaz , Reza Rouzegar , Chihun In , Tim Titze , Maximilian Staabs , Genaro Bierhance
show 13 more authors
Yanzhao Wu Holger Grisk Jakob Walowski Markus Münzenberg Felicitas Gerhard Johannes Kleinlein Tobias Kie{ss}ling Charles Gould Laurens W. Molenkamp Xianmin Zhang Daniel Steil Tom S. Seifert Tobias Kampfrath
This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.mes-hallphysics.optics
keywords femtosecondphotocurrentsspin-galvaniceffectDresselhausspin-orbitcouplinghalf-metallicHeuslerNiMnSbTHzemissionspectroscopyspin-to-chargeconversionultrafastspindynamics
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

This paper reports that femtosecond optical pulses on the ferromagnetic half-metal NiMnSb generate a charge current that emits terahertz radiation. By rotating the magnetization direction $\theta$ relative to the crystal axes and Fourier-analyzing the emitted field, the authors separate the current into a Rashba-type part perpendicular to the magnetization and a Dresselhaus-type part flowing at the mirror angle $-\theta$. They attribute the Dresselhaus part to the bulk spin-galvanic effect: the pump heats the electrons, creating a transient excess of spin $\mu_s \parallel M$, and the spin-momentum-locked states of NiMnSb convert that spin accumulation into a charge current within roughly 10 fs. The current then decays with the electron-cooling time of about 0.25 ps rather than the slower spin-lattice relaxation of about 1 ps, consistent with the half-metallic nature of NiMnSb. If correct, this is the first observation of an ultrafast Dresselhaus spin-galvanic effect, and it suggests a bulk, volume-scaling route to terahertz spintronic emitters.

What carries the argument

The argument is carried by the spin-galvanic tensor $\chi$ of the mm2 point group, which forces the in-plane relations $-\chi_{xy}=\chi_{yx}$ and $\chi_{xx}=-\chi_{yy}$, reducing the current to the compact complex form $I_c = I_R e^{i(\theta+90^\circ)} + I_D e^{-i\theta}$. Fourier transformation with respect to $\theta$ cleanly separates the Rashba amplitude (angular frequency $+1$, imaginary coefficient) from the Dresselhaus amplitude (frequency $-1$, real coefficient), so the two currents can be extracted from the data without assuming a microscopic model. A two-subsystem relaxation model then links the Dresselhaus current to the spin dynamics: the pump-induced spin excess in the magnetization-carrying subsystem transfers to a second subsystem whose spin-momentum-locked states provide the SGE, giving $I_D(t) \propto \mu_s(t) \propto \mu_s^M(t)$.

What would settle it

Grow a series of NiMnSb films with thicknesses from about 5 to 50 nm under identical capping and measure the $e^{-i\theta}$ Fourier amplitude of the THz signal at fixed pump fluence. A bulk spin-galvanic current must scale linearly with NiMnSb thickness, while an interfacial or Hall-type current would saturate; the absence of linear scaling would invalidate the bulk-Dresselhaus assignment.

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Extended reading notes

Core claim

The paper claims that the measured THz photocurrent in a 10-nm NiMnSb film is a superposition $I_c = I_R e^{i(\theta+90^\circ)} + I_D e^{-i\theta}$, with $\theta$ the angle of the in-plane magnetization $\boldsymbol{M}$ with respect to the [100] axis. The Rashba term $I_R$ is found to grow with magnetic-field magnitude and is assigned to an out-of-plane photocurrent converted by the ordinary Hall effect. The Dresselhaus term $I_D$ is independent of field magnitude, reverses with $\boldsymbol{M}$, and its waveform matches the pump-induced reflectance change. The authors conclude that $I_D$ arises from a pump-induced spin accumulation $\boldsymbol{\mu}_s \parallel \boldsymbol{M}$ converted to charge by a Dresselhaus-symmetric spin-galvanic effect in the NiMnSb bulk, with the current responding on the electron momentum-relaxation time of about 10 fs and relaxing as the electrons cool.

Load-bearing premise

The load-bearing premise is that the $e^{-i\theta}$ current component is produced by a pump-induced spin accumulation converted through the bulk Dresselhaus spin-galvanic effect, and that no other magnetization-dependent ultrafast transport process produces the same angular pattern; the paper itself labels this a tentative assumption.

Editorial extensions

If this is right

  • The Dresselhaus spin-galvanic effect responds on the electron momentum-relaxation time of about 10 fs, making it a genuinely femtosecond-scale spin-to-charge conversion channel.
  • Because the spin accumulation relaxes through electron-phonon cooling (~0.25 ps) rather than the slower spin-lattice relaxation (~1 ps), the emitted THz waveform can serve as a time-resolved probe of hot-electron cooling in half-metals.
  • Since the effect resides in the NiMnSb bulk rather than at interfaces, thicker films should emit proportionally stronger THz fields, a scaling behavior unavailable to ferromagnet/heavy-metal bilayers.
  • Fourier decomposition of photocurrents in the magnetization angle is a general tool for isolating Rashba- and Dresselhaus-type spin-charge conversion in other inversion-asymmetric ferromagnets.

Reading between the lines

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

  • Editorial inference: A direct thickness series (for example 5-50 nm NiMnSb with identical caps) should show the $e^{-i\theta}$ Fourier amplitude growing linearly with thickness if the SGE is truly bulk; saturation at small thickness would point to an interface contribution.
  • Editorial inference: The two-subsystem picture predicts that the Dresselhaus current tracks the pump-induced change in electron spin population rather than the net magnetization, so separating spin and non-spin contributions in time-resolved MOKE at multiple probe wavelengths could test the model.
  • Editorial inference: The same angular Fourier analysis could map the bulk Dresselhaus SGE tensor in other noncentrosymmetric conductors, including half-Heusler compounds, where the sign of the $e^{-i\theta}$ coefficient would encode the spin texture.
  • Editorial inference: If volume scaling holds, NiMnSb-based emitters may outperform ferromagnet/heavy-metal bilayers for ultrabroadband THz emission, but the net efficiency also depends on optical absorption depth and conductivity, so this remains to be measured.
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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 / 5 minor

Summary. The manuscript reports THz-emission spectroscopy on 10 nm NiMnSb films excited by 10 fs, 1.55 eV optical pulses. By rotating the in-plane magnetization direction θ, the emitted THz field is decomposed into components with angular dependence e^{+iθ} and e^{-iθ}, corresponding to Rashba- and Dresselhaus-type current patterns. The authors attribute the Rashba-like component to an out-of-plane photocurrent converted by the ordinary Hall effect and the Dresselhaus-like component to a pump-induced spin accumulation μ_s ∥ M converted to a charge current by the bulk spin-galvanic effect in NiMnSb. They interpret the ~0.2 ps relaxation of the Dresselhaus current as following the electron temperature, with the response time set by the ~10 fs momentum relaxation time and a spin-lattice relaxation time τ_sl ≈ 1 ps, and conclude that this is the first ultrafast observation of the Dresselhaus spin-galvanic effect.

Significance. If the identification is correct, this is the first femtosecond observation of a bulk Dresselhaus spin-galvanic effect and provides a promising route to volume-scaled spintronic THz emitters and detectors. The paper has clear strengths: the symmetry analysis is anchored to the independently known mm2 point group and leads to the compact decomposition in Eq. (3); the Rashba-only W|CoFeB|Pt reference sample provides a clean baseline; the MgO-cap control addresses the top interface; and the comparison with reflectance dynamics is a sensible way to connect the current to the electronic temperature. The Fourier decomposition in θ is unusually direct and makes the Rashba/Dresselhaus separation transparent. However, the central identification of the e^{-iθ} component with the bulk SGE is an inference rather than a direct measurement: the discrimination from vertical-spin-current ISHE and from bottom-interface contributions is not fully closed by the presented controls.

major comments (2)
  1. [Rashba- and Dresselhaus-like signal components (Eq. (1), Eq. (3), Supplementary Note 3)] The assignment of the e^{-iθ} current component to the bulk Dresselhaus SGE is not uniquely pinned by the data. The paper argues that a pump-induced spin current converted by a Dresselhaus-type ISHE makes a minor contribution because the MgO cap suppresses transport to the Ru cap. However, the cap experiment only blocks transfer of spin angular momentum from NiMnSb to the top cap; it does not eliminate an internal vertical spin current generated by ultrafast demagnetization and absorbed within the NiMnSb film, nor does it address a bottom-interface contribution at the NiMnSb/InGaAs interface, where the zincblende InGaAs could provide Dresselhaus-type spin-orbit coupling. Since both the ISHE and SGE terms in Eq. (1) are constrained by the same mm2 point group, the angular pattern in Eq. (3) alone cannot distinguish them. A thickness series of NiMnSb (where a bulk SGE should scale with the film volume while interface and vertical-spin-current contributions scale differently) is required to substantiate the bulk origin.
  2. [Dresselhaus current dynamics (Eq. (4), Eq. (17))] The dynamics analysis is partly circular. Equation (17) is written assuming the two-subsystem spin-transfer model and uses τ_sl as a free parameter; the fitted value τ_sl ≈ 1 ps and the conclusion that μ_s relaxation is governed by electron-phonon cooling rather than spin-lattice relaxation therefore follow from the assumed model rather than from an independent test. The similarity between I_D(t) and ΔR(t) is also not discriminating, because any current that follows the electron temperature, including thermoelectric or spin-current-driven currents, would show the same qualitative dynamics. The proportionality chain in Eq. (4), I_D ∝ μ_s ∝ μ_s^M, is an assumption that should be presented as such and not as a derived result.
minor comments (5)
  1. [Abstract and Conclusion] The abstract and conclusion state the Dresselhaus SGE identification categorically, while the main text introduces it as a tentative assumption ("we tentatively assume that the suggested scenario... prevails"). The wording should be harmonized so the level of certainty is consistent throughout.
  2. [References] Reference [30] is a duplicate of reference [8] (both cite Ganichev et al., "Experimental Separation of Rashba and Dresselhaus Spin Splittings in Semiconductor Quantum Wells"); please remove the duplicate.
  3. [Equation (17)] Equation (17) is not displayed in the main text; readers are referred to the Supplement. Please present the equation and a short derivation in the main text, since it is central to the claim about the relaxation time scales.
  4. [Figure 4] Figure 4(b,c) would benefit from labeled axes with units; the current "(arb. units)" notation makes quantitative comparison of I_D(t) and ΔR(t) difficult.
  5. [Supplemental Note 3] The sentence stating that measurements on NiMnSb|MgO stacks indicate the spin-current scenario "makes a minor contribution" should specify the measurement conditions of the MgO-capped sample and report the residual signal amplitude, so the reader can judge the sensitivity of the control.

Circularity Check

1 steps flagged · score 4.0 of 10

The angular decomposition and bulk-Dresselhaus-SGE assignment are not circular, but the dynamics interpretation is partly self-referential: the electron-phonon time constant is transferred from the ΔR fit into the ID fit, and the two-subsystem model comes from prior same-group work.

  1. fitted input called prediction [Dresselhaus current dynamics section, Eq. (17), Fig. 4(b,c)]
    "We obtain the value of τep from fitting the measured reflectance ΔR(t) by an exponential decay with time constant τep plus offset [Eq. (16)] [40], which yields τep = 0.25 ps [Fig. 4(c)]. Finally, we fit ID(t) by a sum of 2 exponentials with time constants τsl and the known τep [Eq. (17)] [26] ... Because τsl ≫ τep, the decay of ID(t) ∝ μs(t) is dominated by electron-phonon relaxation, consistent with the similar relaxation dynamics of ID(t) [Fig. 4(b)] and ΔR(t) [Fig. 4(c)]."

    The electron-phonon time constant τep is not determined from the current ID(t); it is taken from the independently fitted reflectance decay ΔR(t) and then inserted as a fixed input into the model for ID(t), Eq. (17). The 'consistency' between ID(t) and ΔR(t), and the conclusion that electron cooling controls the decay of ID(t), are therefore partly forced by the fitting procedure rather than emerging independently. In addition, Eq. (17) is attributed to Ref. [26], a prior study with overlapping authorship, which already assumes the two-subsystem spin-transfer picture; using that model to extract τsl and then invoking the fit as support for the picture is partially self-referential.

full rationale

The central observation is not an output of the model: the decomposition in Eq. (3) is anchored to the independently known mm2 point group of the sample, and the e^{−iθ} Fourier component is a measured symmetry projection, not a quantity fitted from the SGE tensor. The paper explicitly labels the SGE scenario as tentative ('we tentatively assume'), and the conclusion that the Dresselhaus signal is 'fully compatible' with the SGE is a compatibility statement rather than a derivation from the model. The main alternative (a vertical spin current converted by a Dresselhaus-type ISHE) is experimentally underdetermined by the MgO-cap control, which suppresses transport to the cap but not necessarily an internal vertical spin current or bottom-interface contribution; that is a correctness risk, not a circularity. The only genuine partial circularity is in the dynamics analysis, where τep is obtained from ΔR and then used as a known parameter in the ID fit, and where Eq. (17) comes from prior same-group work. This does not undermine the primary claim that a femtosecond current with Dresselhaus symmetry exists, but it makes the specific relaxation mechanism and the inferred τsl less independent than the presentation suggests.

Assumptions & free parameters 3 free parameters · 4 assumptions · 1 invented entities

The main quantitative conclusions rest on three fitted quantities: the two time constants and the current amplitudes. The angular phases are fixed by symmetry and are not free. The key interpretive burden is carried by the mm2 tensor assumption, the μs ∥ M assumption, and the exclusion of competing transport mechanisms.

free parameters (3)
  • Electron-phonon equilibration time τep = 0.25 ps
    Obtained by fitting the measured reflectance change ΔR(t) to an exponential decay, Eq. (16); then used as an input when fitting the current dynamics.
  • Spin-lattice equilibration time τsl = ~1 ps
    Obtained by fitting the Dresselhaus current ID(t) to a two-exponential model, Eq. (17); the value supports the claim that spin-lattice relaxation is slower than electron-phonon relaxation, but its uncertainty is not reported.
  • Rashba and Dresselhaus current amplitudes IR, ID = arbitrary units, not listed
    Extracted from the θ-Fourier transform of the detected THz signal using Eq. (3); they are fitting amplitudes, not independently predicted constants.
assumptions (4)
  • domain assumption The NiMnSb film has point group mm2, which fixes the SGE tensor components as χxy = -χyx and χxx = -χyy.
    Invoked in Supplemental Note 4 and used to write Eq. (3). If the film symmetry were lower, the Fourier separation of Rashba and Dresselhaus currents would not be exact.
  • domain assumption The photoinduced spin accumulation is parallel to the magnetization and to the applied field, μs ∥ M ∥ Bext, and the SGE tensor is independent of M.
    Stated as a tentative assumption before Eq. (3) and supported by signal reversal with Bext; it is not directly measured.
  • domain assumption Spin-lattice relaxation in NiMnSb is slow enough that, on the observed time scale, μs relaxes by electron-phonon cooling.
    Needed to interpret ID(t) as proportional to μs(t) and to justify Eq. (4) and Eq. (17); based on the half-metallic character cited from Refs. [44,45].
  • domain assumption No competing ultrafast transport mechanism (for example photo-Seebeck or anisotropic magnetoresistance) generates a current with the same θ-dependence.
    Keeps the identification of the Dresselhaus component with the bulk SGE unique; the MgO-cap control removes one competing channel but not all possible effects.
invented entities (1)
  • Weakly coupled electron subsystems (1) and (2)
    purpose: Explains why the magnetization-carrying states and the Dresselhaus SGE states behave separately and why μs follows electron temperature rather than the full magnetization dynamics.
    Introduced in Fig. 4(a) and the dynamics section as a schematic decomposition; no experiment isolates subsystem (2) directly, so it is an interpretive construct.

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Pith. "Pith review of Femtosecond photocurrents by the Dresselhaus bulk spin-galvanic effect in an inversion-asymmetric ferromagnet." pith.science (2026). https://pith.science/paper/TAB7F33L

@misc{pith2026250700360,
  author       = {Pith},
  title        = {Pith review of: Femtosecond photocurrents by the Dresselhaus bulk spin-galvanic effect in an inversion-asymmetric ferromagnet},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/TAB7F33L}},
  note         = {Machine review of arXiv:2507.00360}
}
read the original abstract

We study ultrafast photocurrents in thin films of a model ferromagnetic metal with broken bulk inversion symmetry, the half-metallic Heusler compound NiMnSb, following excitation with an optical pump pulse with photon energy 1.55 eV. Remarkably, in terms of the direction of the sample magnetization M, all photocurrents are found to be a superposition of a component with Rashba- and Dresselhaus-type symmetry. We explain the Dresselhaus bulk photocurrent as follows: Pump-induced electron heating induces an excess of spin {\mu}_s||M, which transfers spin angular momentum into states with Dresselhaus-type spin-momentum locking. The resulting charge current relaxes on a time scale of 10 fs by momentum relaxation and, thus, follows {\mu}_s quasi-instantaneously. The relaxation of {\mu}_s is governed by the cooling of the electrons and not by the significantly slower spin-lattice relaxation of half-metals. Our findings add the Dresselhaus spin-galvanic effect (SGE) to the set of ultrafast spin-charge-conversion phenomena. They indicate a route to more efficient spintronic terahertz emitters and detectors based on the volume scaling of the bulk SGE.

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Reviewed August 6, 2026 · model on record in the stance chip above.