Tunable chiral symmetry breaking in symmetric Weyl materials

Kaushik, Sahal; Philip, Evan John; Cano, Jennifer

doi:10.1103/physrevb.103.085106

Tunable chiral symmetry breaking in symmetric Weyl materials

Journal Article · Wed Feb 03 04:00:00 EST 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.103.085106· OSTI ID:1773158

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Stony Brook Univ., NY (United States); Stony Brook University
Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Stony Brook Univ., NY (United States); Flatiron Inst., New York, NY (United States)

Asymmetric Weyl semimetals, which possess an inherently chiral structure, have different energies and dispersion relations for left- and right-handed fermions. They exhibit certain effects not found in symmetric Weyl semimetals, such as the quantized circular photogalvanic effect and the helical magnetic effect. In this work, we derive the conditions required for breaking chiral symmetry by applying an external field in symmetric Weyl semimetals. Here, we explicitly demonstrate that in certain materials with the T_d point group, magnetic fields along low symmetry directions break the symmetry between left- and right-handed fermions; the symmetry breaking can be tuned by changing the direction and magnitude of the magnetic field. In some cases, we find an imbalance between the number of type I left- and right-handed Weyl cones (which is compensated by the number of type II cones of each chirality).

View Accepted Manuscript (DOE)

Research Organization:: Stony Brook Univ., NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0017662; FG02-88ER40388

OSTI ID:: 1773158

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 8 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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