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<p>The shift current is a non-linear photocurrent generally associated with the underlying quantum geometry. However, a topological origin for the shift photocurrent in non-centrosymmetric systems has recently been proposed. The corresponding topological classification goes beyond the ten-fold paradigm and is associated with the presence of a reverting Thouless pump (RTP). In this work we perform a first-principles computational analysis of antiferromagnetic monolayer within the family of MXenes, Ti<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(_{4}\)</EquationSource> </InlineEquation>C<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(_{3}\)</EquationSource> </InlineEquation>. This material is centrosymmetric, however, magnetic ordering violates inversion symmetry. We demonstrate evidence of an RTP in each spin-sector which has been perturbed, destroying quantization of the invariant. Nevertheless, a giant spin-resolved shift current persists. We further investigate the mid-gap edge states and classification of the system as a fragile topological insulator to which trivial bands have been coupled.</p>

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Evidence for topological contribution to spin shift current in antiferromagnetic Ti\(_{4}\)C\(_{3}\)

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  • 出版模式：

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  • 发表日期：

    2026年1月19日

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  • Ali Sufyan,
  • Hasan M. Abdullah,
  • J. Andreas Larsson,
  • Alexander C. Tyner

摘要

The shift current is a non-linear photocurrent generally associated with the underlying quantum geometry. However, a topological origin for the shift photocurrent in non-centrosymmetric systems has recently been proposed. The corresponding topological classification goes beyond the ten-fold paradigm and is associated with the presence of a reverting Thouless pump (RTP). In this work we perform a first-principles computational analysis of antiferromagnetic monolayer within the family of MXenes, Ti \(_{4}\) C \(_{3}\) . This material is centrosymmetric, however, magnetic ordering violates inversion symmetry. We demonstrate evidence of an RTP in each spin-sector which has been perturbed, destroying quantization of the invariant. Nevertheless, a giant spin-resolved shift current persists. We further investigate the mid-gap edge states and classification of the system as a fragile topological insulator to which trivial bands have been coupled.