J. Phys. IV France
Volume 131, December 2005
Page(s) 251 - 254
Publié en ligne 18 janvier 2006
International Workshop on Electronic Crystals
S. Brazovskii, P. Monceau and N. Kirova
J. Phys. IV France 131 (2005) 251-254

DOI: 10.1051/jp4:2005131063

Quantum electronic phases in partially filled Landau levels

M.O. Goerbig1, P. Lederer1 and C. Morais Smith2

1  Laboratoire de Physique des Solides, Université Paris-Sud (Laboratoire Associé au CNRS), 91405 Orsay Cedex, France
2  Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands

On the basis of energy calculations, we investigate the competition between quantum-liquid and electron-solid phases in intermediate Landau levels as a function of their partial filling factor. An alternation of electron-solid phases, which are insulating because they are pinned by the residual impurities in the sample, and quantum liquids displaying the fractional quantum Hall effect explains an observed reentrance of the integral quantum Hall effect. The phase transitions are identified as first-order. Recent transport measurements under micro-wave irradiation reveal the crystalline origin of the reentrant points, and a mixed phase of a coexisting Wigner crystal and a 2-electron bubble phase is found in a Landau-level filling-factor range $4.15{\lesssim}
4.26$, as expected from our calculations.

© EDP Sciences 2005