Abstract
The chirality of chiral multifold fermions in reciprocal space is related to the chirality of crystal lattice structures in real space. In this study, we propose a strategy to detect and identify multifold fermions of opposite chirality in nonmagnetic systems using second-order optical transports. Chiral crystals related with inversion operations cannot be made to overlap with each other via any experimental operation. Further, chiral multifold fermions within such crystals host opposite chiralities corresponding to a given k point. A change in chirality is indicated by a corresponding change in the sign of the second-order charge current dominated by chiral fermions. This property can be exploited to study the relationship between chiralities in reciprocal and real spaces by utilizing bulk transport.
| Original language | English |
|---|---|
| Article number | 104111 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 10 |
| DOIs | |
| State | Published - Sep 2020 |
Funding
Thanks to I. Sodemann and L. Wu for the helpful discussion. This work was financially supported by the ERC Advanced Grant No. 291472 Idea Heusler, ERC Advanced Grant No. 742068 TOPMAT. This work was performed in part at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure Network (NNCI), which is supported by the National Science Foundation under NSF Award No. 1541959. CNS is part of Harvard University. Some of our calculations were carried out on the Cobra cluster of MPCDF, Max Planck society.