Topological nodal line semimetals with and without spin-orbital coupling

Fang, Chen; Chen, Yige; Kee, Hae -Young; Fu, Liang

doi:10.1103/physrevb.92.081201

Title: Topological nodal line semimetals with and without spin-orbital coupling

Journal Article · Mon Aug 10 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.92.081201· OSTI ID:1505795

Fang, Chen ^[1]; Chen, Yige ^[2]; Kee, Hae -Young ^[2]; Fu, Liang ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Toronto, Toronto, ON (Canada); Canadian Inst. for Advanced Research/Quantum Materials Program, Toronto, ON (Canada)

Here, we theoretically study three-dimensional topological semimetals (TSMs) with nodal lines protected by crystalline symmetries. Compared to TSMs with point nodes, e.g., Weyl semimetals and Dirac semimetals, where the conduction and the valence bands touch at discrete points, in these TSMs the two bands cross at closed lines in the Brillouin zone. We propose two different classes of symmetry protected nodal lines in the absence and in the presence of spin-orbital coupling (SOC), respectively. In the former, we discuss nodal lines that are protected by a combination of inversion symmetry and time-reversal symmetry, yet, unlike previously studied nodal lines in the same symmetry class, each nodal line has a Z₂ monopole charge and can only be created (annihilated) in pairs. In the second class, with SOC, we show that a nonsymmorphic symmetry (screw axis) protects a four-band crossing nodal line in systems having both inversion and time-reversal symmetries.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001299; FG02-09ER46577

OSTI ID:: 1505795

Alternate ID(s):: OSTI ID: 1209840

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 8; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 631 works

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