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Title: Landau levels and shallow donor states in GaAs/AlGaAs multiple quantum wells at megagauss magnetic fields

Abstract

Landau levels and shallow donor states in multiple GaAs/AlGaAs quantum wells (MQWs) are investigated in this paper by means of the cyclotron resonance at megagauss magnetic fields. Measurements of magneto-optical transitions were performed in pulsed fields up to 140 T and temperatures from 6–300 K. The 14 x 14 P∙p band model for GaAs is used to interpret free-electron transitions in a magnetic field. Temperature behavior of the observed resonant structure indicates, in addition to the free-electron Landau states, contributions of magnetodonor states in the GaAs wells and possibly in the AlGaAs barriers. The magnetodonor energies are calculated using a variational procedure suitable for high magnetic fields and accounting for conduction band nonparabolicity in GaAs. It is shown that the above states, including their spin splitting, allow one to interpret the observed magneto-optical transitions in MQWs in the middle infrared region. Finally, our experimental and theoretical results at very high magnetic fields are consistent with the picture used previously for GaAs/AlGaAs MQWs at lower magnetic fields.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [3]
  1. Univ. of Rzeszów (Poland). Centre for Microelectronics and Nanotechnology
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Physics
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1441306
Alternate Identifier(s):
OSTI ID: 1348864
Report Number(s):
LA-UR-17-27396
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
AC52-06NA25396; DMR-1157490
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Landau levels; quantum wells; optically detected magnetic resonance

Citation Formats

Zybert, M., Marchewka, M., Sheregii, E. M., Rickel, D. G., Betts, J. B., Balakirev, F. F., Gordon, M., Stier, A. V., Mielke, C. H., Pfeffer, P., and Zawadzki, W. Landau levels and shallow donor states in GaAs/AlGaAs multiple quantum wells at megagauss magnetic fields. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.115432.
Zybert, M., Marchewka, M., Sheregii, E. M., Rickel, D. G., Betts, J. B., Balakirev, F. F., Gordon, M., Stier, A. V., Mielke, C. H., Pfeffer, P., & Zawadzki, W. Landau levels and shallow donor states in GaAs/AlGaAs multiple quantum wells at megagauss magnetic fields. United States. doi:10.1103/PhysRevB.95.115432.
Zybert, M., Marchewka, M., Sheregii, E. M., Rickel, D. G., Betts, J. B., Balakirev, F. F., Gordon, M., Stier, A. V., Mielke, C. H., Pfeffer, P., and Zawadzki, W. Mon . "Landau levels and shallow donor states in GaAs/AlGaAs multiple quantum wells at megagauss magnetic fields". United States. doi:10.1103/PhysRevB.95.115432. https://www.osti.gov/servlets/purl/1441306.
@article{osti_1441306,
title = {Landau levels and shallow donor states in GaAs/AlGaAs multiple quantum wells at megagauss magnetic fields},
author = {Zybert, M. and Marchewka, M. and Sheregii, E. M. and Rickel, D. G. and Betts, J. B. and Balakirev, F. F. and Gordon, M. and Stier, A. V. and Mielke, C. H. and Pfeffer, P. and Zawadzki, W.},
abstractNote = {Landau levels and shallow donor states in multiple GaAs/AlGaAs quantum wells (MQWs) are investigated in this paper by means of the cyclotron resonance at megagauss magnetic fields. Measurements of magneto-optical transitions were performed in pulsed fields up to 140 T and temperatures from 6–300 K. The 14 x 14 P∙p band model for GaAs is used to interpret free-electron transitions in a magnetic field. Temperature behavior of the observed resonant structure indicates, in addition to the free-electron Landau states, contributions of magnetodonor states in the GaAs wells and possibly in the AlGaAs barriers. The magnetodonor energies are calculated using a variational procedure suitable for high magnetic fields and accounting for conduction band nonparabolicity in GaAs. It is shown that the above states, including their spin splitting, allow one to interpret the observed magneto-optical transitions in MQWs in the middle infrared region. Finally, our experimental and theoretical results at very high magnetic fields are consistent with the picture used previously for GaAs/AlGaAs MQWs at lower magnetic fields.},
doi = {10.1103/PhysRevB.95.115432},
journal = {Physical Review B},
number = 11,
volume = 95,
place = {United States},
year = {2017},
month = {3}
}

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Figures / Tables:

FIG. 1 FIG. 1: Optical magneto-transmission (solid curves) and magnetic field intensity (dotted curves) versus time for three temperatures and laser wavelength λ2 = 9.69 µm

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