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Gapless Higgs mode in the Fulde-Ferrell-Larkin-Ovchinnikov state of a superconductor

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); University of Houston, TX (United States)
  2. University of Houston, TX (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
We report the Higgs mode associated with amplitude fluctuations of the superconducting gap in uniform superconductors is usually heavy, which makes its excitation and detection difficult. We report on the existence of a gapless Higgs mode in the Fulde-Ferrell-Larkin-Ovchinnikov states. This feature originates from the Goldstone mode associated with translation-symmetry breaking. The existence of the gapless Higgs mode is demonstrated by using both a phenomenological model and microscopic Bardeen-Cooper-Schrieffer (BCS) theory. The gapless Higgs mode can avoid the decay into other low-energy excitations, which renders it stable and detectable.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Robert A. Welch Foundation; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1874184
Report Number(s):
LA-UR-21-24876
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 1 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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