Fengqi Song

Gate-tunable large second-order and third-order nonlinear Hall effect in topological insulator BiSbTeSe 2

The nonlinear Hall effect (NLHE) holds significant promise for next-generation electronic device applications, and it is essential to explore and engineer a strong and highly tunable NLHE. In this work, we report large second-order and third-order NLHEs in dual-gated BiSbTeSe2 de...

Probing the Anomalous Symmetry Breaking in Kagome Material CsV3Sb5 via Third-Order Nonlinearity

Abstract The kagome material has rapidly established itself as a research frontier in condensed matter physics, owing to its distinctive geometric structure and the rich array of unconventional physical phenomena. In the kagome AV3Sb5 (A = K, Rb, and Cs) family, the charge-ordere...