Nonlinear charge transport properties in chiral tellurium
arxiv(2024)
摘要
Extensive research has focused on phenomena arising from the chirality of
crystalline or magnetic structures. Recently, we have proposed the "Nonlinear
Chiral Thermo-Electric (NCTE) Hall effect," in which current flows in the
direction of the cross product of the electric field and the temperature
gradient in a material with a chiral structure. Despite its importance for
device applications such as heat flow sensors and logic circuits, there are no
quantitative demonstrations in actual materials. We investigate the NCTE Hall
effect and the second-order response to the electric field in Te, which hosts
the chiral crystal structure, based on ab initio calculations and symmetry
argument. We clarify that the NCTE Hall current can flow parallel to the chiral
axis, whereas such behavior is absent for the second-order response to the DC
electric field. Quantitative estimation predicts the large NCTE Hall current
which is sufficiently detectable in experiments, and the orbital magnetic
moment will play an important role in the vicinity of the top of the valence
band.
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