Nonlinear optical spectroscopy of indirect excitons in biased coupled quantum wells

Abstract

Indirect excitons in coupled quantum wells are long-living quasi-particles, explored in the studies of collective quantum states. We demonstrate, that despite the extremely low oscillator strength, their spin and population dynamics can by addressed by time-resolved pump-probe spectroscopy. Our experiments make it possible to unravel and compare spin dynamics of direct excitons, indirect excitons and residual free electrons in coupled quantum wells. Measured spin relaxation time of indirect excitons exceeds not only one of direct excitons, but also one of free electrons by two orders of magnitude.

10 pages, 8 figures

References in corpus (5)

• Gate-controlled spin-orbit interaction in a parabolic GaAs/AlGaAs quantum well
• Localization-Delocalization Transition of Indirect Excitons in Lateral Electrostatic Lattices
• Spin relaxation of localized electrons in n-type semiconductors
• Spin coherence of holes in GaAs/AlGaAs quantum wells
• Spin dynamics of electrons and holes in InGaAs/GaAs quantum wells at milliKelvin temperatures

Cited by in corpus (4)

• Capacitively-coupled and inductively-coupled excitons in bilayer MoS${}_2$
• Exciton-exciton and exciton-charge carrier interaction and the exciton collisional broadening in GaAs/AlGaAs quantum wells
• Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons
• Classical and quantum dynamics of indirect excitons driven by surface acoustic waves