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arxiv: 2511.09511 · v3 · submitted 2025-11-12 · ❄️ cond-mat.mes-hall

Spin and orbital-to-charge conversion in noncentrosymmetric materials: Hall versus Rashba-Edelstein effects

Pith reviewed 2026-05-17 22:09 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall
keywords Rashba-Edelstein effectspin Hall effectorbital Hall effectnoncentrosymmetricGeTedrift-diffusion modelcharge conversionbroken inversion symmetry
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The pith

The Rashba-Edelstein effect primarily governs charge current generation from spin and orbital conversion in noncentrosymmetric materials.

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

This paper develops a general formalism using macroscopic observables to describe spin and orbital to charge conversion in materials with broken inversion symmetry. It treats the Hall effect and Rashba-Edelstein effect equally. In a case study of ferroelectric GeTe the fitted Rashba parameter is smaller than earlier reports. When fed into a drift-diffusion model the charge current turns out to be driven mainly by the Rashba-Edelstein effect instead of spin or orbital Hall effects.

Core claim

We investigate spin- and orbital-to-charge conversion phenomena in nonmagnetic materials with broken inversion symmetry, treating the contributions from the Hall effect and the Rashba-Edelstein effect on an equal footing. We develop a general formalism for this interconversion based solely on macroscopic observables. The theory is validated through a case study of ferroelectric GeTe, where we find that the effective Rashba parameter obtained is smaller than previously reported values for the same material. Incorporating these parameters into a drift-diffusion model, we show that the generated charge current is primarily governed by the Rashba-Edelstein effect, rather than by the spin or orb

What carries the argument

General formalism based on macroscopic observables that places Hall and Rashba-Edelstein contributions on equal footing for conversion analysis.

If this is right

  • The generated charge current is primarily governed by the Rashba-Edelstein effect.
  • The effective Rashba parameter for GeTe is smaller than previously reported.
  • Drift-diffusion models can predict the relative importance of different conversion mechanisms using fitted parameters.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same macroscopic approach could be applied to other noncentrosymmetric materials to identify dominant conversion channels.
  • Device design in spintronics might benefit from emphasizing interface Rashba effects over bulk Hall responses.
  • Further experiments on GeTe could verify if the smaller Rashba value holds across different conditions.

Load-bearing premise

The macroscopic observables formalism accurately captures the interconversion without needing microscopic band-structure details and the fitted Rashba parameter for GeTe transfers to the drift-diffusion model.

What would settle it

A measurement of the charge current in GeTe under spin or orbital current injection that does not match the drift-diffusion model prediction based on the reported Rashba parameter would disprove the primary governance by the Rashba-Edelstein effect.

Figures

Figures reproduced from arXiv: 2511.09511 by Aurelien Manchon, Diego Garcia Ovalle.

Figure 1
Figure 1. Figure 1: FIG. 1. (Color online) Sketch of the spin-to-charge conversion [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (Color online) Crystal structure and band structure [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (Color online) (a) Longitudinal conductivity (black [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (Color online) (a) charge-to-spin (red) and charge-to [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. (Color online) (a) Density of states coefficient, mod [PITH_FULL_IMAGE:figures/full_fig_p006_7.png] view at source ↗
read the original abstract

We investigate spin- and orbital-to-charge conversion phenomena in nonmagnetic materials with broken inversion symmetry, treating the contributions from the Hall effect and the Rashba-Edelstein effect on an equal footing. We develop a general formalism for this interconversion based solely on macroscopic observables. The theory is validated through a case study of ferroelectric GeTe, where we find that the effective Rashba parameter obtained is smaller than previously reported values for the same material. Incorporating these parameters into a drift-diffusion model, we show that the generated charge current is primarily governed by the Rashba-Edelstein effect, rather than by the spin or orbital Hall effects.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript develops a general formalism for spin- and orbital-to-charge conversion in noncentrosymmetric materials, treating Hall and Rashba-Edelstein contributions on equal footing and relying solely on macroscopic observables. Validation is performed via a case study on ferroelectric GeTe, yielding an effective Rashba parameter smaller than prior reports. These parameters are then inserted into a drift-diffusion model, from which the authors conclude that the generated charge current is primarily governed by the Rashba-Edelstein effect rather than spin or orbital Hall effects.

Significance. If the central claim is robust, the work supplies a macroscopic route to separating conversion mechanisms that avoids full microscopic band-structure input, which could streamline analysis of spin-orbit phenomena in polar materials. The reported smaller Rashba parameter for GeTe and the resulting dominance of Rashba-Edelstein conversion would refine expectations for device-relevant current generation in similar systems.

major comments (2)
  1. [Abstract / GeTe case study] Abstract and GeTe case study: the central claim that Rashba-Edelstein dominates rests on extracting a fitted effective Rashba parameter from the macroscopic formalism and inserting it unchanged into the drift-diffusion model. The manuscript provides no explicit test of whether this parameter remains valid once k-dependent orbital textures or scattering channels (omitted or averaged in the macroscopic treatment) are restored at the drift-diffusion level; without such a consistency check the dominance conclusion risks being an artifact of inconsistent modeling levels.
  2. [Drift-diffusion modeling] Drift-diffusion modeling section: the relative weighting of Rashba-Edelstein versus Hall contributions is reported to favor the former, yet the text does not quantify the sensitivity of this ordering to the precise value of the fitted Rashba parameter (including its uncertainty relative to earlier literature values). Because the ordering is the load-bearing result, a parameter-variation or error-propagation analysis is required to establish that the conclusion is not driven by the particular fitted number.
minor comments (2)
  1. [Formalism] Notation for the macroscopic observables (e.g., the precise definitions of the effective conversion coefficients) should be collected in a single table or appendix for clarity.
  2. [GeTe case study] A brief comparison table of the new Rashba parameter against the range of previously reported values for GeTe would help readers assess the magnitude of the reported reduction.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough review and constructive feedback on our manuscript. We address the two major comments point by point below, providing our reasoning and indicating where revisions will be made to strengthen the presentation.

read point-by-point responses
  1. Referee: [Abstract / GeTe case study] Abstract and GeTe case study: the central claim that Rashba-Edelstein dominates rests on extracting a fitted effective Rashba parameter from the macroscopic formalism and inserting it unchanged into the drift-diffusion model. The manuscript provides no explicit test of whether this parameter remains valid once k-dependent orbital textures or scattering channels (omitted or averaged in the macroscopic treatment) are restored at the drift-diffusion level; without such a consistency check the dominance conclusion risks being an artifact of inconsistent modeling levels.

    Authors: We appreciate the referee raising this consistency concern. Our macroscopic formalism is deliberately constructed to produce effective parameters that already incorporate averaged contributions from orbital and spin textures, without explicit k-dependence. The subsequent drift-diffusion model operates at a comparable phenomenological level and is intended to employ precisely these effective quantities derived from macroscopic observables. By design, the two stages remain consistent within the effective-description framework that forms the core of the work; restoring full microscopic k-dependent details would require a separate band-structure calculation outside the stated scope. We therefore do not consider the procedure an artifact. To improve clarity we will insert a short explanatory paragraph in the revised manuscript justifying the use of the effective Rashba parameter across both stages. revision: partial

  2. Referee: [Drift-diffusion modeling] Drift-diffusion modeling section: the relative weighting of Rashba-Edelstein versus Hall contributions is reported to favor the former, yet the text does not quantify the sensitivity of this ordering to the precise value of the fitted Rashba parameter (including its uncertainty relative to earlier literature values). Because the ordering is the load-bearing result, a parameter-variation or error-propagation analysis is required to establish that the conclusion is not driven by the particular fitted number.

    Authors: The referee correctly identifies that a sensitivity analysis would make the dominance conclusion more robust. In the revised version we will add a dedicated subsection (or appendix) that varies the effective Rashba parameter over the range of its fitted uncertainty and compares it with the spread of previously reported values for GeTe. We will show that the Rashba-Edelstein contribution remains the leading term throughout this interval. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation remains self-contained

full rationale

The paper develops a new general formalism for spin/orbital-to-charge conversion based on macroscopic observables, validates it on ferroelectric GeTe by extracting an effective Rashba parameter (reported smaller than prior values), and then inserts those parameters into a standard drift-diffusion model to conclude Rashba-Edelstein dominance. No step reduces by construction to its own inputs: the formalism is presented as independent of microscopic band details, the parameter extraction is a validation step rather than a self-referential fit, and the drift-diffusion conclusion follows from applying the extracted values rather than re-deriving them tautologically. No self-citations are load-bearing for the central claim, no ansatz is smuggled, and no uniqueness theorem is invoked from prior author work. The derivation chain is therefore independent of the target result.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

Based solely on the abstract, the central claim rests on the transferability of a fitted Rashba parameter and the assumption that macroscopic observables suffice without microscopic input.

free parameters (1)
  • effective Rashba parameter for GeTe
    Obtained from the case study and stated to be smaller than previously reported; used as input to the drift-diffusion model.
axioms (1)
  • domain assumption Macroscopic observables fully capture spin- and orbital-to-charge conversion without microscopic band details
    Invoked to justify the general formalism in noncentrosymmetric materials.

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Reference graph

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