Kramers nodal line metals

Ying-Ming Xie, Xue-Jian Gao, Xiao Yan Xu, Cheng-Ping Zhang, Jin-Xin Hu, Jason Z. Gao and K. T. Law ()
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Ying-Ming Xie: Hong Kong University of Science and Technology
Xue-Jian Gao: Hong Kong University of Science and Technology
Xiao Yan Xu: University of California at San Diego
Cheng-Ping Zhang: Hong Kong University of Science and Technology
Jin-Xin Hu: Hong Kong University of Science and Technology
Jason Z. Gao: Hong Kong University of Science and Technology
K. T. Law: Hong Kong University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Recently, it was pointed out that all chiral crystals with spin-orbit coupling (SOC) can be Kramers Weyl semimetals (KWSs) which possess Weyl points pinned at time-reversal invariant momenta. In this work, we show that all achiral non-centrosymmetric materials with SOC can be a new class of topological materials, which we term Kramers nodal line metals (KNLMs). In KNLMs, there are doubly degenerate lines, which we call Kramers nodal lines (KNLs), connecting time-reversal invariant momenta. The KNLs create two types of Fermi surfaces, namely, the spindle torus type and the octdong type. Interestingly, all the electrons on octdong Fermi surfaces are described by two-dimensional massless Dirac Hamiltonians. These materials support quantized optical conductance in thin films. We further show that KNLMs can be regarded as parent states of KWSs. Therefore, we conclude that all non-centrosymmetric metals with SOC are topological, as they can be either KWSs or KNLMs.

Date: 2021
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DOI: 10.1038/s41467-021-22903-9

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