Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Topology: Quantum Hall Systems

TT 31.2: Talk

Wednesday, March 19, 2025, 15:30–15:45, H31

Electric Field Induced Second-Order Anomalous Hall Transport in an Unconventional Rashba System — •Ankita Bhattacharya and Annica Black-Schaffer — Uppsala University, Sweden

Nonlinear responses in transport experiments may unveil information and generate new phenomena in materials that are not accessible at linear order due to symmetry constraints. While the linear anomalous Hall response strictly requires the absence of time-reversal symmetry, the second order, thus nonlinear, Hall response needs broken inversion symmetry. Recently, much effort has been made to obtain a second-order Hall voltage in response to a longitudinal ac driving current, both to obtain information about band geometric quantities and for its useful technological applications in rectification and frequency doubling. Typically, additional material engineering is required in noncentrosymmetric systems to obtain second-order responses since it obeys a stringent crystallographic symmetry constraint. To circumvent this, an alternative route is to apply a dc electric field. In our work, we uncover an electric field induced second-order anomalous Hall effect in an inversion-broken system possessing unconventional Rashba bands. We establish that the quantum metric, a geometrical feature of electronic wave functions providing information on non-trivial structure of Bloch bands, is responsible for providing the nonlinear Hall response. We are able to find a highly tunable electric field induced second-order anomalous Hall transport in probably the simplest system in 2D, which should be uncomplicated to verify experimentally due to multiple materials already being proposed.