Phase transition in a two-dimensional dipole-oriented exciton system

✍ Scribed by T. Fukuzawa; S.Y. Kim; T.K. Gustafson; E.E. Haller; E. Yamada

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 45 KB
• Volume: 23
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0291

✦ Synopsis

A dipole-oriented two-dimensional exciton system in electrically biased GaAs/AlGaAs coupled quantum wells has been studied through photoluminescence. The system has a sample-dependent built-in random potential which traps excitons at low temperature. The average photoluminescence photon energy shows a sudden reduction when the excitation intensity exceeds a critical value at low temperatures. This suggests a phase transition from a Bose glass to superfluid phase.