手性晶体一硅化钴中由轨道磁矩诱导的非线性电荷与热输运性质
Nonlinear charge and thermal transport properties induced by orbital magnetic moment in chiral crystal cobalt monosilicide
AI总结：
基于ab initio计算与对称性分析，研究了一硅化钴中由轨道磁矩主导的非线性热电电荷与热霍尔效应，发现该效应在RSW费米子附近显著增强。
摘要：
迄今为止，人们已在非磁性B20型化合物中讨论了动量空间中奇异奇点的存在，例如自旋1激发和Rarita-Schwinger-Weyl (RSW) 费米子，以探索其独特现象。同时，非线性热电 (NCTE) 电荷与热霍尔效应——一种正比于电场与温度梯度叉乘的响应——预期会存在于这种手性材料中，但在B20型化合物中仍未被探索。在此，基于ab initio计算和对称性分析，我们定量分析了一硅化钴中的NCTE电荷与热霍尔效应，获得了沿[111]方向的NCTE电荷与热霍尔电流的实验可测值，这对于直流电场的二阶电流响应是未预期的。此外，我们证明这些显著响应在RSW费米子和自旋1激发附近得到增强。另外，我们阐明由于立方手性晶体中Berry曲率贡献的抵消，NCTE霍尔效应完全由轨道磁矩主导。
英文摘要：
The existence of exotic singularities in momentum space, such as spin-1 excitations and Rarita-Schwinger-Weyl (RSW) fermions, has been discussed so far to explore unique phenomena in the nonmagnetic B20-type compounds. Meanwhile, the Nonlinear Thermo-Electric (NCTE) charge and thermal Hall effect, a response proportional to the cross product of the electric field and temperature gradient, is expected in this chiral material, yet remains unexplored in B20-type compounds. Here, based on $ab \ initio$ calculations and symmetry analysis, we quantitatively analyze the NCTE charge and thermal Hall effects in cobalt monosilicide, obtaining experimentally measurable values of NCTE charge and thermal Hall current along [111] direction, which is not expected for second-order current responses to the DC electric field. Furthermore, we demonstrate that these significant responses are enhanced around RSW fermions and spin-1 excitations. Additionally, we clarify that the NCTE Hall effect is solely governed by orbital magnetic moments due to the cancellation of Berry curvature contributions in cubic chiral crystals.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
