arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.01311cond-mat.mtrl-sci
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反晶体中手征多重费米子手征性的确定

Identification of chirality of chiral multifold fermions in anti-crystals

Yan Sun, Qiunan Xu, Yang Zhang, Congcong Le, Claudia Felser

摘要:

倒易空间中手征多重费米子的手征性与实空间中晶格结构的手征性有关。在这项工作中,我们提出了一个策略,通过二阶光输运检测和识别反手性多重费米子在双折射系统。手征晶体通过反演操作相关联,并且不能通过任何实验操作彼此重叠,并且对于给定的k点,晶体中的手征多重费米子具有相反的手征性。由手征费米子主导的二阶电荷电流的符号变化表示手征的变化。这种策略可以有效地利用体输运来研究倒易空间和实空间中手征性之间的关系。

英文摘要:

The chirality of chiral multifold fermions in reciprocal space is related to the chirality of the crystal lattice structure in real space. In this work, we propose a strategy to detect and identify opposite-chirality multifold fermions in nonmagnetic systems by means of second-order optical transports. The chiral crystals are related by an inversion operation and cannot overlap with each other by any experimental operation, and the chiral multifold fermions in the crystals host opposite chiralities for a given k-point. A change of chirality is indicated by a sign change of the second-order charge current dominated by chiral fermions. This strategy is effective to study the relationship between chiralities in reciprocal and real spaces by utilizing bulk transport.

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