Quasi-Nambu-Goldstone Modes in Bose-Einstein Condensates

Details Quasi-Nambu-Goldstone Modes in Bose-Einstein Condensates Quasi-Nambu-Goldstone Modes in Bose-Einstein Condensates

2010-10-14

arxiv.org/abs/1010.2864v2

Phys.Rev.Lett.105:230406,2010

Physics

Condensed Matter

Quantum Gases

v2: 4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.105.230406

We show that quasi-Nambu-Goldstone (NG) modes, which play prominent roles in high energy physics but have been elusive experimentally, can be realized with atomic Bose-Einstein condensates. The quasi-NG modes emerge when the symmetry of a ground state is larger than that of the Hamiltonian. When they appear, the conventional vacuum manifold should be enlarged. Consequently topological defects that are stable within the conventional vacuum manifold become unstable and decay by emitting the quasi-NG modes. Contrary to conventional wisdom, however, we show that the topological defects are stabilized by quantum fluctuations that make the quasi-NG modes massive, thereby suppressing their emission.

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