Quasi-nambu-Goldstone modes in Bose-Einstein condensates

Shun Uchino, Michikazu Kobayashi, Muneto Nitta, Masahito Ueda

研究成果: Article査読

39 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号230406
ジャーナルPhysical review letters
105
23
DOI
出版ステータスPublished - 2010 12 3

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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