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 2003 |
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Keywords
- Bogoliubov theory
- Bose-Einstein condensates
- Excitation spectra
- Optical lattice
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Excitation spectra of Bose-Einstein condensates in optical lattice. / Ichioka, Masanori; Machida, Kazushige.
In: Journal of the Physical Society of Japan, Vol. 72, No. 9, 09.2003, p. 2137-2140.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Excitation spectra of Bose-Einstein condensates in optical lattice
AU - Ichioka, Masanori
AU - Machida, Kazushige
PY - 2003/9
Y1 - 2003/9
N2 - 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.
AB - 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.
KW - Bogoliubov theory
KW - Bose-Einstein condensates
KW - Excitation spectra
KW - Optical lattice
UR - http://www.scopus.com/inward/record.url?scp=0242676090&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0242676090&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.72.2137
DO - 10.1143/JPSJ.72.2137
M3 - Article
AN - SCOPUS:0242676090
VL - 72
SP - 2137
EP - 2140
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 9
ER -