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.

*This work is supported by the NSF and the R.A. Welch foundation.

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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