交错磁翘曲拓扑绝缘体中的非线性霍尔效应
Nonlinear Hall Effect in Altermagnetic Warped Topological Insulators
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中文总结 AI 辅助
该研究通过将六角翘曲拓扑绝缘体与d波交错磁体邻近耦合，打破镜面对称，使量子度量偶极子驱动非线性霍尔效应，并可通过取向角连续调控，为量子度量自旋电子学提供新平台。
中文摘要 AI 辅助
低维狄拉克系统为量子几何非线性输运提供了多功能平台。拓扑绝缘体（TI）表面态中的六角翘曲产生了丰富的动量空间几何纹理。然而，镜面对称和时间反演对称严格约束贝里曲率和量子度量偶极子均为零。在这里，我们展示了将六角翘曲的TI与d波交错磁体进行邻近耦合，通过C_{3v}翘曲与d波自旋劈裂的相互作用，提升了空间镜面对称性。这种对称性破缺使得有限的贝里曲率偶极子分量成为可能，然而，这些分量在电荷中性点附近仍受到严重抑制，从而确立了本征量子度量偶极子作为非线性霍尔响应的唯一驱动因素。这种与散射无关的响应在μ=0处消失，并在化学势反转下表现出奇宇称。重要的是，旋转交错磁体的取向角φ可连续调节量子度量偶极子并诱导符号反转，在φ=0附近达到峰值，在φ=π/4处消失。我们的发现突显了TI-交错磁体界面作为栅极和取向可调的量子度量自旋电子学的理想候选平台。
英文摘要
Low-dimensional Dirac systems offer a versatile platform for quantum-geometric non-linear transport. Hexagonal warping in topological insulator (TI) surface states generates rich momentum-space geometric textures. However, mirror and time-reversal symmetries strictly constrain both the Berry curvature and quantum metric dipoles to zero. Here, we show that proximity-coupling a hexagonally warped TI to a d-wave altermagnet lifts spatial mirror symmetry via the interplay of C_{3v} warping and d-wave spin-splitting. This symmetry breaking enables finite Berry curvature dipole components, which, however, remain heavily suppressed near charge neutrality, establishing the intrinsic quantum metric dipole as the sole driver of the non-linear Hall response. This scattering-independent response vanishes at μ= 0 and exhibits odd parity under chemical potential inversion. Importantly, rotating the altermagnetic orientation angle ϕcontinuously tunes quantum metric dipole and induces a sign reversal, peaking near ϕ=0 and vanishing at ϕ= π/4. Our findings highlight TI-altermagnet interfaces as ideal candidates for gate- and orientation-tunable quantum metric spintronics.
发表机构
- Centre for Nanotechnology, Indian Institute of Technology Roorkee（印度鲁尔基理工学院纳米技术中心）
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