Kinetics of indirect excitons in the optically-induced exciton trap

Abstract

We report on the kinetics of a low-temperature gas of indirect excitons in the optically-induced exciton trap. The excitons in the region of laser excitation are found to rapidly -- within 4 ns -- cool to the lattice temperature T = 1.4 K, while the excitons at the trap center are found to be cold -- essentially at the lattice temperature -- even during the excitation pulse. The loading time of excitons to the trap center is found to be about 40 ns, longer than the cooling time yet shorter than the lifetime of the indirect excitons. The observed time hierarchy is favorable for creating a dense and cold exciton gas in optically-induced traps and for in situ control of the gas by varying the excitation profile in space and time before the excitons recombine.

4 pages, 3 figures

References in corpus (4)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• Trapping of Cold Excitons with Laser Light
• Artificial trapping of a stable high-density dipolar exciton fluid

Cited by in corpus (12)

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• Excitonic transport driven by repulsive dipolar interaction in a van der Waals heterostructure
• Superfluidity of dipole excitons in two layers of gapped graphene
• Kinetics of the inner ring in the exciton emission pattern in GaAs coupled quantum wells
• Acoustic Traps and Lattices for Electrons in Semiconductors
• Measurement of exciton correlations using electrostatic lattices
• Pattern Formation in the Exciton Inner Ring
• Drift-diffusion model of the fragmentation of the external ring structure in the photoluminescence pattern of indirect excitons in coupled quantum wells
• Nonlinear Optical Probe of Indirect Excitons
• Model of fragmentation of the exciton inner ring in semiconductor quantum wells
• Keldysh Green's function approach to coherence in a non-equilibrium steady state: connecting Bose-Einstein condensation and lasing
• Spatially and time-resolved imaging of transport of indirect excitons in high magnetic fields