Rotons in a hybrid Bose-Fermi system |
| |
Authors: | Shelykh Ivan A Taylor Thomas Kavokin Alexey V |
| |
Institution: | Science Institute, University of Iceland, Dunhagi-3, IS-107, Reykjavik, Iceland. |
| |
Abstract: | We calculate the spectrum of elementary excitations in a two-dimensional exciton condensate in the vicinity of a two-dimensional electron gas. We show that attraction of excitons due to their scattering with free electrons may lead to formation of a roton minimum. The energy of this minimum may go below the ground state energy which manifests breaking of the superfluidity. The Berezinsky-Kosterlitz-Thouless phase transition temperature decreases due to the exciton-exciton attraction mediated by electrons. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|