Author:
Gorbunov A. V.,Larionov A. V.,Kulik L. V.,Timofeev V. B.
Abstract
The spatial spreading of a dense ensemble of spin cyclotron magnetoexcitons in a quantum Hall insulator at the filling factor ν = 2 is visualized using an optical system with a high aperture ratio. It is found that nondiffusive propagation over macroscopic distances is characteristic not only of excitons with a momentum on the order of the reciprocal magnetic length, which form a coherent condensate of magnetoexcitons, but also of excitons with very low momenta. The nondiffusive propagation of magnetoexciton condensates in real space is accompanied by a huge threshold increase in the amplitude of light reflection from excitations. The possible explanations of the observed behavior are discussed.
Subject
Physics and Astronomy (miscellaneous)
Reference36 articles.
1. S. A. Moskalenko, Sov. Phys. Solid State 4, 199 (1962).
2. J. M. Blatt, K. W. Böer, and W. Brandt, Phys. Rev. 126, 1691 (1962).
3. R. C. Casella, J. Phys. Chem. Solids 24, 19 (1963).
4. L. V. Keldysh and A. N. Kozlov, JETP Lett. 5, 190 (1967).
5. L. V. Keldysh and A. N. Kozlov, Sov. Phys. JETP 27, 521 (1968).