Excitation spectra of Bose-Einstein condensates in optical lattice

Masanori Ichioka, Kazushige Machida

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The excitation spectra of Bose-Einstein condensates are investigated in a three-dimensional optical lattice by the Bogoliubov theory considering the original sinusoidal potential for the optical lattice. When the lattice potential becomes high, the excitations show softening at large wavelengths, suggesting the breakdown of superfluidity. We also study the filling and interaction dependences of the properties of the excitation spectra and one-dimensional lattice case.

Original languageEnglish
Pages (from-to)2137-2140
Number of pages4
Journaljournal of the physical society of japan
Issue number9
Publication statusPublished - Sept 2003


  • Bogoliubov theory
  • Bose-Einstein condensates
  • Excitation spectra
  • Optical lattice

ASJC Scopus subject areas

  • General Physics and Astronomy


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