Fizika Nizkikh Temperatur: Volume 44, Number 9 (September 2018), p. 1111-1160 ( to contents , go back )
Electron-hole superconductivity (Review Article)
Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave., Kharkiv 61072, Ukraine
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
Received March 30, 2018, published online July 26, 2018
This review is devoted to the theory of electron-hole super-fluidity in double-layer systems. The question is about the state in that electrons and holes from adjacent layers form bound pairs and nondissipative transfer of charge is provided by motion of pairs as wholes. The occurrence of flow of bound pairs is equivalent to the flowing equal in module and the oppositely directed electric currents in conducting layers. Therefore such super-fluidity can be considered as a special type of superconductivity that is often called counterflow superconductivity. This phenomenon was predicted about 40 years ago, but the study of the problem of electron-hole superconductivity in the double-layer systems is in progress until now. In the review the extensive description of theoretical grounds and approaches to the problem of electron-hole superconductivity is presented.
Key words: electron-hole pairing, exciton superfluidity, bilayer systems.