Nonlinear optical spectroscopy of indirect excitons in coupled quantum wells

P Andreakou,A V Kavokin,N A Gippius,A Nalitov,D Scalbert,M Vladimirova,M Nawrocki,S Cronenberger,K L Campman,L V Butov,A C Gossard,J R Leonard

doi:10.1103/physrevb.91.125437

Nonlinear optical spectroscopy of indirect excitons in coupled quantum wells

P Andreakou, A V Kavokin + Show 10 more

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https://doi.org/10.1103/physrevb.91.125437

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Journal: Physical review. B	Publication Date: Mar 30, 2015
Citations: 26	License type: publisher-specific, author manuscript

Affiliation: Laboratoire Charles Coulomb, University of Montpellier, French National Centre for Scientific Research, Russian Quantum Center, University of Southampton, St Petersburg University, Institut Pascal, Skolkovo Institute of Science and Technology, University of Warsaw, University of California, Santa Barbara, University of California, San Diego

#Coupled Quantum Wells #Indirect Excitons + Show 8 more

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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.

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