Amplitude Higgs Mode and Admittance in Superconductors with a Moving Condensate

Andreas Moor; Anatoly F. Volkov; Konstantin B. Efetov

doi:10.1103/PhysRevLett.118.047001

← Back to search

Amplitude Higgs Mode and Admittance in Superconductors with a Moving Condensate

Andreas Moor, Anatoly F. Volkov, Konstantin B. Efetov

DOI 10.1103/PhysRevLett.118.047001 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We consider the amplitude (Higgs) mode in a superconductor with a condensate flow (supercurrent). We demonstrate that, in this case, the amplitude mode corresponding to oscillations δ|Δ|Ωexp(iΩt) of the superconducting gap is excited by an external ac electric field EΩexp(iΩt) already in the first order in |EΩ|, so that δ|Δ|Ω∝(v0EΩ), where v0 is the velocity of the condensate. The frequency dependence δ|Δ|Ω has a resonance shape with a maximum at Ω=2Δ. In contrast to the standard situation without the condensate flow, the oscillations of the amplitude δ|Δ(t)| contribute to the admittance YΩ. We provide a formula for admittance of a superconductor with a supercurrent. The predicted effect opens new ways of experimental investigation of the amplitude mode in superconductors and materials with superconductivity competing with other states.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.2	Pressure not reported	unknown