Higher odd-order nonlinear Hall effect in magnetic topological insulator Mn(Bi1-xSbx)2Te4
Xiubing Li, Zheng Dai, Shuai Zhang, Heng Zhang, Congcong Li + 8 more
TLDR
Researchers observed higher odd-order (3rd, 5th, 7th) nonlinear Hall effects in Mn(Bi1-xSbx)2Te4, linking them to Berry curvature multipoles.
Key contributions
- Experimentally observed 3rd, 5th, and 7th order nonlinear Hall effects in Mn(Bi1-xSbx)2Te4 thin flakes.
- The higher odd-order Hall voltage exhibits twofold angular dependence and exists below the Néel temperature.
- Effect is present in both odd- and even-layer samples, decaying exponentially with increasing order.
- Theoretical analysis suggests the responses arise from Berry curvature multipoles.
Why it matters
This work significantly advances the study of nonlinear Hall effects by demonstrating higher odd-order phenomena beyond previous research. It provides crucial experimental evidence and theoretical insights, paving the way for deeper understanding of quantum transport in topological materials.
Original Abstract
The nonlinear Hall effect is a new member of the Hall effect family, which attracts intense research interests, and it is closely related to the quantum geometry of quantum materials. The previous studies primarily concentrate on the second-order and third-order nonlinear Hall effect. However, the experimental study of higher-order nonlinear Hall effect is scarce at present. In this work, we report the observations of the higher odd-order (third-, fifth-, seventh-order) nonlinear Hall effect in magnetic topological insulator Mn(Bi1-xSbx)2Te4 thin flakes. The higher odd-order nonlinear Hall voltage exhibits a twofold angular dependence and exists only below the Néel temperature. It reaches its maximum near the charge neutral point and decays exponentially as the order of the nonlinear Hall effect increases. Furthermore, such higher odd-order nonlinear Hall effect is observed in both odd- and even-layer samples with comparable magnitudes. Theoretical analysis indicates that the higher odd-order nonlinear Hall effect responses may arise from the Berry curvature multipoles. Our work paves the way for the study of the higher-order nonlinear transport phenomena.
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