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Title: Evaluation of hole-spin superposition in GaAs/AlGaAs quantum wells through time-resolved photoluminescence measurements

Relaxation dynamics of the up–down superposition of hole spins in undoped GaAs/AlGaAs quantum wells were investigated by means of time-resolved photoluminescence (PL) measurements with a view toward achieving quantum bits using hole spins. Linearly polarized PL signals reflecting the hole-spin superposition were observed using linearly polarized excitation light under quasi-resonant excitation conditions. In contrast to circular-polarization experiments conducted under nonresonant excitation conditions, the decay time of the degree of linear polarization obtained from the time-resolved PL signal increased slightly with increasing quantum confinement energy. These experimental results demonstrate that the creation and observation of hole-spin superposition under resonant conditions are crucial for manipulating hole-spin quantum bits.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4]
  1. Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011 (Japan)
  2. (Japan)
  3. NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-0198 (Japan)
  4. Department of Physics, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Higasinada-ku, Kobe 658-8501 (Japan)
Publication Date:
OSTI Identifier:
22304454
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM COMPOUNDS; CONFINEMENT; EXCITATION; GALLIUM ARSENIDES; HOLES; PHOTOLUMINESCENCE; POLARIZATION; QUANTUM WELLS; QUBITS; RELAXATION; SPIN; TIME RESOLUTION; VISIBLE RADIATION