Dynamical Casimir effect for magnons in a spinor Bose-Einstein condensate

Hiroki Saito and Hiroyuki Hyuga
Phys. Rev. A 78, 033605 – Published 9 September 2008

Abstract

Magnon excitation in a spinor Bose-Einstein condensate by a driven magnetic field is shown to have a close analogy with the dynamical Casimir effect. A time-dependent external magnetic field amplifies quantum fluctuations in the magnetic ground state of the condensate, leading to magnetization of the system. The magnetization occurs in a direction perpendicular to the magnetic field breaking the rotation symmetry. This phenomenon is numerically demonstrated and the excited quantum field is shown to be squeezed.

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  • Received 13 May 2008

DOI:https://doi.org/10.1103/PhysRevA.78.033605

©2008 American Physical Society

Authors & Affiliations

Hiroki Saito1 and Hiroyuki Hyuga2

  • 1Department of Applied Physics and Chemistry, The University of Electro-Communications, Tokyo 182-8585, Japan
  • 2Department of Physics, Keio University, Yokohama 223-8522, Japan

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Issue

Vol. 78, Iss. 3 — September 2008

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