Optical initialization and dynamics of spin in a remotely doped quantum well

Journal Article · Sun Jan 15 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.0· OSTI ID:20787855

Kennedy, T A; Scheibner, M; Efros, Al L; Bracker, A S; Gammon, D ^[1]; Shabaev, A ^[2]

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1. Naval Research Laboratory, Washington, DC 20375 (United States)
2. Naval Research Laboratory, Washington, D.C. 20375 (United States)

The excitation of electron spin polarization and coherence by picosecond light pulses and their dynamics in a wide remotely doped quantum well are studied theoretically and experimentally. Assuming that all electrons in the quantum well are localized, the theory considers the resonant interaction of light pulses with the four-level system formed by the electron spins of the ground state and the hole spins of the trion excited state. The theory describes the effects of spontaneous emission, a transverse magnetic field and hole spin relaxation on the dynamics detected by the Kerr rotation of a probe pulse. Time resolved Kerr rotation experiments were carried out on a remotely doped 14 nm GaAs quantum well in the frequency range of optical transitions to the heavy hole (HH) trion and to the light-hole (LH) trion degenerate with the HH exciton. The experiments on the resonant excitation of the HH trion show a very slow heavy hole spin relaxation and, consequently, a weak electron spin polarization after the trion relaxation. In contrast, the resonant excitation of the LH trion/HH exciton results in a fast hole spin relaxation that increases electron spin polarization.

• OSTI ID: 20787855
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 4; Other Information: DOI: 10.1103/PhysRevB.73.045307; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
DOPED MATERIALS
ELECTRONS
EXCITATION
EXCITED STATES
EXCITONS
GALLIUM ARSENIDES
GROUND STATES
HOLES
MAGNETIC FIELDS
POLARIZATION
PULSES
QUANTUM WELLS
RELAXATION
ROTATION
SEMICONDUCTOR MATERIALS
SPIN
SPIN ORIENTATION
TIME RESOLUTION
VISIBLE RADIATION