Dynamical instability of the XY spiral state of ferromagnetic condensates

ORAL

Abstract

We calculate the spectrum of collective excitations of the XY spiral state prepared adiabatically or suddenly from a uniform ferromagnetic F = 1 condensate. For spiral wavevectors past a critical value, spin wave excitation energies become imaginary indicating a dynamical instability. We construct phase diagrams as functions of spiral wavevector and quadratic Zeeman energy.

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Authors

  • Robert Cherng

    • Harvard University

  • Vladimir Gritsev

    • Harvard University

  • Dan Stamper-Kurn

    • University of California, Berkeley

  • Eugene Demler

    • Harvard University