Phase transitions in a system of indirect magnetoexcitons in coupled quantum wells at high magnetic field: the role of disorder

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dc.creatorBerman, Oleg L.
dc.creatorLozovik, Yurii E.
dc.creatorSnoke, David W.
dc.creatorCoalson, Rob D.
dc.date2004-08-26
dc.date.accessioned2026-07-07T02:59:58Z
dc.date.available2026-07-07T02:59:58Z
dc.descriptionCollective properties of a quasi-two-dimensional (2D) system of spatially indirect magnetoexcitons in coupled quantum wells (CQW) in high magnetic field $H$ were analyzed in the presence of disorder. The Hamiltonian of the dilute gas of magnetoexcitons with dipole-dipole repulsion in a random field has been reduced to the Hamiltonian of a dilute gas of dipolar excitons without an applied magnetic field, but in an $H$-dependent effective random field and having an effective mass of magnetoexciton which is a function of the magnetic field and parameters of the CQW. For 2D magnetoexcitonic systems, the increase of the magnetic field $H$ and the interwell distance $D$ is found to increase the effective renormalized random field parameter $Q$ and suppress the superfluid density $n_s$ and the temperature of the Kosterlitz-Thouless transition $T_c$. It is shown that in the presence of the disorder there is a quantum transition to the superfluid state at zero temperature T=0 with respect to the magnetic field $H$ and the parameters of the disorder. There is no superfluidity at any exciton density in the presence of the disorder at sufficiently large magnetic field $H$ or sufficiently large disorder.
dc.description4 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/cond-mat/0408581
dc.identifierhttp://arxiv.org/abs/cond-mat/0408581
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24719
dc.subjectMesoscale and Nanoscale Physics
dc.titlePhase transitions in a system of indirect magnetoexcitons in coupled quantum wells at high magnetic field: the role of disorder
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