Journal ArticleDOI
Infrared and polarization anomalies in the optical spectra of modulation-doped semiconductor quantum-well structures
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TLDR
It is argued that even at low doping concentrations, excitons are heavily dressed by charge- and spin-density excitations of the Fermi sea, implying, already in that limit, a Stokes shift between emission and absorption.Abstract:
We investigate the physical processes which determine the optical spectra of modulation-doped semiconductor quantum-well structures as a function of doping. We argue that even at low doping concentrations, excitons are heavily dressed by charge- and spin-density excitations of the Fermi sea, implying, already in that limit, a Stokes shift between emission and absorption. For all doping concentrations, the charge and spin polarization of the Fermi sea due to many-body effects leads to an enhancement of the symmetry breaking in quantum-well structures, which may explain polarization anomalies observed in luminescence.read more
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Journal ArticleDOI
Linear and nonlinear optical properties of semiconductor quantum wells
TL;DR: In this paper, the experimental and theoretical investigations of the linear and nonlinear optical properties of semiconductor quantum well structures, including the effects of electrostatic fields, extrinsic carriers and real or virtual photocarriers, are reviewed.
Journal ArticleDOI
Observation of ultralong valley lifetime in WSe2/MoS2 heterostructures.
Jonghwan Kim,Jonghwan Kim,Chenhao Jin,Bin Chen,Hui Cai,Tao Zhao,Puiyee Lee,Salman Kahn,Kenji Watanabe,Takashi Taniguchi,Sefaattin Tongay,Michael F. Crommie,Michael F. Crommie,Feng Wang,Feng Wang +14 more
TL;DR: In this article, a microsecond-long-lived valley polarization in 2D transition metal dichalcogenides (TMD) was achieved by exploiting the ultrafast charge transfer processes in the heterostructure that efficiently creates resident holes in the WSe2 layer.
Journal ArticleDOI
Free carrier and many-body effects in absorption spectra of modulation-doped quantum wells
Gabriela Livescu,David A. B. Miller,Daniel S. Chemla,M. Ramaswamy,Tallis Y. Chang,N. J. Sauer,Arthur C. Gossard,J.H. English +7 more
TL;DR: In this article, a many-body calculation of the electron-hole correlation enhancement is presented, which identifies this peak with the Mahan exciton, the result of the Coulomb interaction between the photoexcited hole in the valence band and the sea of electrons in the conduction band.
Journal ArticleDOI
Spin relaxation and thermalization of excitons in GaAs quantum wells
TL;DR: In this article, the authors present results on the picosecond dynamics of spin relaxation and thermalization of excitons in GaAs quantum wells, showing that the spin relaxation time constant is ≊50 ps for resonant excitation and less than 10 ps for non-resonant excitations.