Temperature and many-body effects on the intersubband transition in a GaAs/Al0.3Ga0.7As multiple quantum well

F. Szmulowicz, M. O. Manasreh, C. E. Stutz, and T. Vaughan
Phys. Rev. B 50, 11618 – Published 15 October 1994
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Abstract

Temperature and many-body effects on the intersubband transition in a GaAs/Al0.3Ga0.7As multiple quantum well are studied using the infrared-absorption technique and the envelope-function-approximation method. In order to explain the measured peak position energy of the intersubband transition and its blueshift observed by decreasing temperature and/or increasing the two-dimensional electron-gas density, a theoretical model is developed which is based on a nonparabolic-anisotropic envelope-function-approximation (NAEFA) method. This model takes into account the many-body corrections, in particular, temperature-dependent electron-electron intrasubband and intersubband exchange and direct Coulomb interaction energies as well as the depolarization and excitonlike shifts within the framework of Zaluzny’s implementation of Ando’s formalism [Phys. Rev. B 43, 4511 (1991)]. Temperature-dependent effective masses, nonparabolicity, conduction-band offsets, the Fermi level, and line-shape broadening are also incorporated in the present NAEFA calculations. Our theory provides a qualitative explanation for the magnitude of the measured temperature blueshift. Additional support for many-body effects is obtained by utilizing the persistent photoeffect measurements.

  • Received 27 June 1994

DOI:https://doi.org/10.1103/PhysRevB.50.11618

©1994 American Physical Society

Authors & Affiliations

F. Szmulowicz

  • Materials Directorate (WL/MLPO), Wright Laboratory, Wright-Patterson Air Force Base, Ohio 45433-6533
  • University of Dayton Research Institute, Dayton, Ohio 45469

M. O. Manasreh and C. E. Stutz

  • Solid State Electronics Directorate (WL/ELRA), Wright Laboratory, Wright-Patterson Air Force Base, Ohio 45433-6543

T. Vaughan

  • Clarendon Laboratory, Parks Road, Oxford OX1 3PU, England

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Issue

Vol. 50, Iss. 16 — 15 October 1994

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