Abstract
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 language | English |
|---|---|
| Pages (from-to) | 2137-2140 |
| Number of pages | 4 |
| Journal | journal of the physical society of japan |
| Volume | 72 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 2003 |
Keywords
- Bogoliubov theory
- Bose-Einstein condensates
- Excitation spectra
- Optical lattice
ASJC Scopus subject areas
- Physics and Astronomy(all)