Excitons in two dimensions: the excitation spectrum and phase transition to superfluidity

✍ Scribed by Z.G. Koinov

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 85 KB
• Volume: 265
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00841-5

✦ Synopsis

The Bethe-Salpeter equation for two-dimensional excitons is solved in the low-density limit. The analysis of the collective modes leads to a spectrum of the Bogolubov type. It was found that the critical temperature of the Kosterlitz-Thouless phase transition to exciton superfluidity scales linearly with the exciton density.