Macroscopically ordered state in exciton system
Abstract
Macroscopically ordered arrays of vortices in quantum liquids, such as superconductors, He-II, and atom Bose-Einstein Condensates (BEC), demonstrate macroscopic coherence in flowing superfluids [1-4]. Despite of the rich variety of systems where quantum liquids reveal macroscopic ordering, experimental observation of a macroscopically ordered electronic state in semiconductors has remained a challenging unexplored problem. A system of excitons is a promising candidate for the realization of macroscopic ordering in a quantum liquid in semiconductors. An exciton is a bound pair of an electron and a hole. At low densities, it is a Bose quasi-particle. At low temperatures, of the order of a few Kelvins, excitons can form a quantum liquid, i.e., a statistically degenerate Bose gas and eventually BEC [5-9]. Here, we report the experimental observation of a macroscopically ordered state in an exciton system.
Cite
@article{arxiv.cond-mat/0204482,
title = {Macroscopically ordered state in exciton system},
author = {L. V. Butov and A. C. Gossard and D. S. Chemla},
journal= {arXiv preprint arXiv:cond-mat/0204482},
year = {2009}
}
Comments
5 pages (2 col) including 4 figures