Single Nodal Loop of Accidental Degeneracies in Minimal Symmetry: Triclinic CaAs3

Quan, Y.; Yin, Z. P.; Pickett, W. E.

doi:10.1103/PhysRevLett.118.176402

Single Nodal Loop of Accidental Degeneracies in Minimal Symmetry: Triclinic ${CaAs}_{3}$

Journal Article · Tue Apr 25 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.118.176402· OSTI ID:1544395

Quan, Y. ^[1]; Yin, Z. P. ^[1]; Pickett, W. E. ^[2]

Beijing Normal Univ. (China). Dept. of Physics and Center for Advanced Quantum Studies
Univ. of California, Davis, CA (United States). Dept. of Physics

The existence of closed loops of degeneracies in crystals has been intimately connected with associated crystal symmetries, raising the following question: What is the minimum symmetry required for topological character, and can one find an example? Triclinic

{CaAs}_{3}

, in the space group P1¯ with only a center of inversion, has been found to display, without need for tuning, a nodal loop of accidental degeneracies with topological character, centered on one face of the Brillouin zone that is otherwise fully gapped. The small loop is very flat in energy, yet is cut four times by the Fermi energy, a condition that results in an intricate repeated touching of inversion related pairs of Fermi surfaces at Weyl points. Spin-orbit coupling lifts the fourfold degeneracy along the loop, leaving trivial Kramers pairs. Here, with its single nodal loop that emerges without protection from any point group symmetry,

{CaAs}_{3}

represents the primal “hydrogen atom” of nodal loop systems.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544395

Alternate ID(s):: OSTI ID: 1353141

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 118; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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