2008年7月
Supersolid state of ultracold fermions in optical lattice
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
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- 巻
- 77
- 号
- 7
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1143/JPSJ.77.073602
- 出版者・発行元
- PHYSICAL SOC JAPAN
We study ultracold fermionic atoms trapped in an optical lattice with harmonic confinement by dynamical mean-field approximation. It is demonstrated that a supersolid state, where an s-wave superfluid coexists with a density-wave state with a checkerboard pattern, is stabilized by attractive onsite interactions on a square lattice. Our new finding here is that a confining potential plays an invaluable role in stabilizing the supersolid state. We establish a rich phase diagram at low temperatures, which clearly shows how an insulator, a density wave and a superfluid compete with each other to produce an interesting domain structure. Our results shed light on the possibility of the supersolid state in fermionic optical lattice systems.
- リンク情報
- ID情報
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- DOI : 10.1143/JPSJ.77.073602
- ISSN : 0031-9015
- Web of Science ID : WOS:000257833400003