Session T1: Hybrid Systems, Optomechanics and Macroscopic Systems at the Quantum Limit II

2:30 PM–5:30 PM, Wednesday, February 29, 2012
Room: 203

Sponsoring Unit: DAMOP
Chair: Ofer Firstenberg, Harvard University

Abstract ID: BAPS.2012.MAR.T1.11

Abstract: T1.00011 : Formation and decay of a Bose-Einstein condensate of trapped dipole excitons

4:30 PM–4:42 PM

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  German Kolmakov
    (New York City College of Technology CUNY)

  Oleg Berman
    (New York City College of Technology CUNY)

  Roman Kezerashvili
    (New York City College of Technology CUNY)

  Yurii Lozovik
    (Institute of Spectroscopy RAS)

We study the nonlinear dynamics of formation and decay of a Bose-Einstein condensate of dipole excitons trapped in an external confining potential in coupled quantum wells. The problem is considered within an analytical approach and in numerical simulations. The trap restricts the spatial distribution of excitons and results in non-uniform density distribution in the exciton cloud. We demonstrate that under typical experimental conditions, regardless of a long-range nonlocal interaction of the dipole excitons, the system can be described by a generalized Gross-Pitaevskii equation with the local interaction between the excitons, and we find the effective interaction constant. In the numerical simulations, we account for the finite lifetime of dipole excitons and generation of the excitons due to continuous laser pumping. We also discuss formation and decay of vortex states in the condensate.

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