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Anisotropic dynamics of a spin-orbit-coupled Bose-Einstein condensate (Articolo in rivista)

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Anisotropic dynamics of a spin-orbit-coupled Bose-Einstein condensate (Articolo in rivista) (literal)

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Martone Giovanni I. [ 1,2 ] ; Li Yun [ 1,2 ] ; Pitaevskii Lev P. [ 1,2,3 ] ; Stringari Sandro [ 1,2 ] (2012)
Anisotropic dynamics of a spin-orbit-coupled Bose-Einstein condensate
in Physical review. A
(literal)

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Martone Giovanni I. [ 1,2 ] ; Li Yun [ 1,2 ] ; Pitaevskii Lev P. [ 1,2,3 ] ; Stringari Sandro [ 1,2 ] (literal)

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

Titolo

Abstract

By calculating the density response function we identify the excitation spectrum of a Bose-Einstein condensate with equal Rashba and Dresselhaus spin-orbit coupling. We find that the velocity of sound along the direction of spin-orbit coupling is deeply quenched and vanishes when one approaches the second-order phase transition between the plane-wave and the zero momentum quantum phases. We also point out the emergence of a roton minimum in the excitation spectrum for small values of the Raman coupling, providing the onset of the transition to the stripe phase. Our findings point out the occurrence of a strong anisotropy in the dynamic behavior of the gas. A hydrodynamic description accounting for the collective oscillations in both uniform and harmonically trapped gases is also derived. (literal)

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