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Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

Journal Article · · Communications Physics
 [1];  [2];  [3];  [4];  [5];  [1];  [3];  [1];  [1];  [3];  [1];  [6];  [3];  [3];  [3]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of Florida, Gainesville, FL (United States); Univ. of California, Davis, CA (United States)
  3. Univ. of California, Davis, CA (United States)
  4. Riken CPR, Wako (Japan)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Davis, CA (United States)
  6. Tohoku Univ., Oarai (Japan)
+ Show Author Affiliations
Unconventional superconductors have Cooper pairs with lower symmetries than in conventional superconductors. In most unconventional superconductors, the additional symmetry breaking occurs in relation to typical ingredients such as strongly correlated Fermi liquid phases, magnetic fluctuations, or strong spin-orbit coupling in noncentrosymmetric structures. In this article, we show that the time-reversal symmetry breaking in the superconductor LaNiGa2 is enabled by its previously unknown topological electronic band structure, with Dirac lines and a Dirac loop at the Fermi level. Two symmetry related Dirac points even remain degenerate under spin-orbit coupling. These unique topological features enable an unconventional superconducting gap in which time-reversal symmetry can be broken in the absence of other typical ingredients. Our findings provide a route to identify a new type of unconventional superconductors based on nonsymmorphic symmetries and will enable future discoveries of topological crystalline superconductors.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); GIMRT; Air Force Office of Scientific Research (AFOSR); JST CREST; National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1848072
Journal Information:
Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 5; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
superconducting properties and materials
topological matter