论文标题
六角形扭曲诱导非磁性拓扑绝缘子中的非线性平面nernst效应
Hexagonal Warping Induced Nonlinear Planar Nernst Effect in Nonmagnetic Topological Insulators
论文作者
论文摘要
我们从理论上提出了一种新的效应，即在存在面内磁场的非磁性拓扑绝缘子（TI）BI2TE3中，在非磁性拓扑绝缘子（Ti）BI2TE3中提出了一种新效应。我们发现，Nernst电流用温度梯度二次地尺度，但用磁场线性线性地缩放，并表现出磁场方向相对于温度梯度方向的余弦依赖性。 NPNE具有量子来源，该量子是由于六边形翘曲效果，旋转摩托明锁定和磁场引起的时间反转对称性破裂而导致非线性横向旋转电流到电荷电流的转化。
We propose theoretically a new effect, i.e. nonlinear planar Nernst effect (NPNE), in nonmagnetic topological insulator (TI) Bi2Te3 in the presence of an in-plane magnetic field. We find that the Nernst current scales quadratically with temperature gradient but linearly with magnetic field and exhibits a cosine dependence of the orientation of the magnetic field with respect to the direction of the temperature gradient. The NPNE has a quantum origin arising from the conversion of a nonlinear transverse spin current to a charge current due to a joint result of hexagonal warping effect, spin-momentum locking, and the time-reversal symmetry breaking induced by the magnetic field.
