Berry Phase Effect on Semiclassical Dynamics of Bogoliubov Quasiparticles

ORAL

Abstract

We develop a semiclassical theory for Bogoliubov quasiparticles in a superfluid by following the center of mass motion of a quasiparticle wavepacket. Berry phase arises when the underlying condensate moves, invalidating the usual canonical relation between the mechanical momentum and position variables. The equations of motion become non-canonical, and the quantization rule and the density of states are also modified. We study quasiparticles in a condensate with a vortex to show explicitly the Berry phase effects and their experimental observation.

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Authors

  • Chuanwei Zhang

    Department of Physics \& Center for Nonlinear Dynamics, The University of Texas at Austin

  • Artem Dudarev

    Max-Planck-Institut f\"{u}r Physik Komplexer Systeme, Dresden, Germany

  • Qian Niu

    Department of Physics, University of Texas, Austin, TX 78712, The University of Texas at Austin, Austin, TX 78712, Department of Physics, The University of Texas, Austin, TX 78703, Department of Physics, The University of Texas at Austin, University of Texas at Austin