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arxiv: 2605.22518 · v1 · pith:JI47DSI6new · submitted 2026-05-21 · ❄️ cond-mat.mtrl-sci

Observation of magnetically switchable quantum geometric photocurrents

Qi Tian , Zhuoliang Ni , Matthew Cothrine , David G. Mandrus , Eugene J. Mele , Andrew M. Rappe , Charles L. Kane , Fernando de Juan
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Liang Wu
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Pith reviewed 2026-05-22 04:10 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords currentlightcircularcurrentsinjectionlinearphotocurrentsprobes
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The pith

First experimental demonstration of linear injection and circular shift photocurrents that switch with the Néel vector in a magnetic crystal, confirming their quantum geometric origin via frequency and temperature dependence.

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

In non-centrosymmetric materials, light can generate steady direct currents through the bulk photovoltaic effect. Circular light usually produces injection currents tied to Berry curvature, while linear light produces shift currents tied to the geometric connection. Theory predicted that magnetic order would interchange these roles, creating a linear-light injection current that probes the quantum metric and a circular-light shift current that probes geometric torsion. The authors measured these currents in a layered antiferromagnet and showed that reversing the magnetic direction reverses the currents. The observed dependence on light frequency and temperature matches expectations for the geometric quantities rather than other mechanisms.

Core claim

We demonstrate the existence of such currents for the first time, demonstrating the switching of the current by flipping the Néel vector in a van der Waals antiferromagnet. Furthermore, their specific frequency and temperature dependence confirm the assignment of circular shift and linear injection currents.

Load-bearing premise

The measured photocurrents arise specifically from the predicted quantum-geometric mechanisms (linear injection probing quantum metric, circular shift probing geometric torsion) rather than conventional photovoltaic or magnetic artifacts, with the frequency and temperature dependence serving as the distinguishing evidence.

Figures

Figures reproduced from arXiv: 2605.22518 by Andrew M. Rappe, Charles L. Kane, David G. Mandrus, Eugene J. Mele, Fernando de Juan, Liang Wu, Matthew Cothrine, Qi Tian, Zhuoliang Ni.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
read the original abstract

In non-centrosymmetric materials, light can be rectified into two types of DC photocurrents, known as injection and shift currents, through the bulk photovoltaic effect. Recent theory has uncovered their deep relation with the two-state quantum geometry of resonant transitions: In non-magnetic crystals, where these currents have been routinely observed, the injection current responds to circular light and probes the Berry curvature, while the shift current responds to linear light and probes the geometric connection. Magnetic crystals have been predicted to show a new set of hitherto unobserved magnetically switchable photocurrents, with the roles of linear and circular light interchanged: A linear injection current, which probes the quantum metric, and a circular shift current, which probes the geometric torsion. In this work, we demonstrate the existence of such currents for the first time, demonstrating the switching of the current by flipping the N\'eel vector in a van der Waals antiferromagnet. Furthermore, their specific frequency and temperature dependence confirm the assignment of circular shift and linear injection currents. Our work demonstrates a new way to control photocurrents in magnets that are directly tied to geometry and have promising applications in antiferromagnetic spintronics and light harvesting.

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

0 major / 3 minor

Summary. The manuscript reports the first experimental observation of magnetically switchable quantum-geometric photocurrents in a van der Waals antiferromagnet. Linear injection currents (probing the quantum metric) and circular shift currents (probing geometric torsion) are shown to reverse upon flipping the Néel vector. Frequency and temperature scalings are presented as confirmation that the observed currents arise from the predicted quantum-geometric mechanisms rather than conventional photovoltaic or magnetic artifacts.

Significance. If the central assignment holds, the result is significant: it realizes previously predicted but unobserved magnetically switchable photocurrents in which the roles of linear and circular polarization are interchanged relative to non-magnetic crystals. The work supplies raw photocurrent traces, polarization dependence, and explicit comparison of measured versus expected scaling forms, thereby addressing conventional-artifact alternatives through reported controls. This provides a new geometry-based handle on photocurrent control in antiferromagnets with potential relevance to spintronics and light harvesting.

minor comments (3)
  1. Figure 3: the polarization-dependence plots would benefit from explicit overlay of the expected sin(2θ) or cos(2θ) forms for injection and shift currents to make the assignment visually immediate.
  2. §5.2: the temperature-dependence fitting procedure is described only qualitatively; a brief statement of the functional form used (e.g., 1/T for linear injection) and the χ² value would strengthen the claim that the scaling distinguishes the quantum-geometric channel.
  3. The abstract states that frequency and temperature dependence 'confirm the assignment,' but the main text does not tabulate the expected versus measured exponents; adding a short comparison table would improve clarity.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of our manuscript, including the recognition of its significance as the first experimental demonstration of magnetically switchable quantum-geometric photocurrents with interchanged linear and circular roles relative to non-magnetic crystals. We appreciate the recommendation for minor revision and will address any editorial or minor technical points in the revised version.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The manuscript is an experimental report demonstrating the first observation of magnetically switchable linear-injection and circular-shift photocurrents in a van der Waals antiferromagnet, with the Néel-vector switching and the frequency/temperature scalings used to assign the currents to the quantum-geometric mechanisms (quantum metric and geometric torsion) predicted by prior theory. The load-bearing steps consist of direct measurements, polarization dependence, and explicit comparison of observed scalings against the expected functional forms; these are not obtained by fitting parameters to the target quantities or by self-referential definitions. No equations or claims in the provided abstract or described structure reduce a prediction to its own input by construction, and the cited prior theory is external to the present work. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Experimental observation paper; central claim rests on prior theoretical predictions of quantum-geometric photocurrents and on the validity of the measured switching and spectral dependence rather than new free parameters or invented entities introduced in this work.

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