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

Zhao Huang; C. S. Ting; Jian-Xin Zhu; Shi-Zeng Lin

doi:10.1103/PhysRevB.105.014502

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

Zhao Huang, C. S. Ting, Jian-Xin Zhu, Shi-Zeng Lin

DOI 10.1103/PhysRevB.105.014502 · Physical Review B

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbxTi1-xN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown