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Rapid ramps across the BEC-BCS crossover: A route to measuring the superfluid gap (Articolo in rivista)

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Rapid ramps across the BEC-BCS crossover: A route to measuring the superfluid gap (Articolo in rivista) (literal)

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Scott R. G. [ 1,2 ] ; Dalfovo F. [ 1,2 ] ; Pitaevskii L.P. [ 1,2,3 ] ; Stringari S. [ 1,2 ] (2012)
Rapid ramps across the BEC-BCS crossover: A route to measuring the superfluid gap
in Physical review. A
(literal)

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Scott R. G. [ 1,2 ] ; Dalfovo F. [ 1,2 ] ; Pitaevskii L.P. [ 1,2,3 ] ; Stringari S. [ 1,2 ] (literal)

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[ 1 ] Univ Trent, INO CNR BEC Ctr, I-38123 Povo, Italy [ 2 ] Univ Trent, Dipartimento Fis, I-38123 Povo, Italy [ 3 ] Kapitza Inst Phys Problems, Moscow 119334, Russia (literal)

Titolo

Rapid ramps across the BEC-BCS crossover: A route to measuring the superfluid gap (literal)

Abstract

We investigate the response of superfluid Fermi gases to rapid changes of the three-dimensional s-wave scattering length a by solving the time-dependent Bogoliubov-de Gennes equations. In general the magnitude of the order parameter vertical bar Delta vertical bar performs oscillations, which are sometimes called the \"Higgs\" mode, with the angular frequency 2 Delta(gap)/(h) over bar, where Delta(gap) is the gap in the spectrum of fermionic excitations. First, we excite the oscillations with a linear ramp of 1/a and study the evolution of vertical bar Delta vertical bar. Second, we continously drive the system with a sinusoidal modulation of 1/a. In the first case, the oscillations in vertical bar Delta vertical bar damp according to a power law. In the second case, the continued driving causes revivals in the oscillations. In both cases, the excitation of the oscillations causes a reduction in the time-averaged value of vertical bar Delta vertical bar. We propose two experimental protocols, based around the two approaches, to measure the frequency and damping of the oscillations, and hence Lambda(gap). (literal)

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