Magnetotransport in a wide parabolic quantum well

M. Shayegan; T. Sajoto; J. Jo; M. Santos; L. Engel

doi:10.1016/0039-6028(90)90840-5

Magnetotransport in a wide parabolic quantum well

M. Shayegan, T. Sajoto, J. Jo, M. Santos, L. Engel

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Abstract

Measurements of the magnetoresistance of a high-quality electron system realized in a selectively doped, parabolic Al_xGa_1-xAs well are reported. Quantum oscillations in the magnetoresistance are analyzed to obtain the electron densities of the electric subbands. These densities are in agreement with the predictions of a self-consistent calculation of the subband structure for this system. With the magnetic field B slightly tilted away from the sample plane, we observe a dramatic manifestation of the subband-Landau-level coupling. At low B, the magnetic depopulation of the hybrid (electric-magnetic) subbands occurs, while at higher fields, Shubnikov-de Haas-like oscillations (periodic in 1 B) are observed as the Fermi level crosses the quantized energy levels associated with the lowest hybrid subband.

Original language	English (US)
Pages (from-to)	83-87
Number of pages	5
Journal	Surface Science
Volume	229
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(90)90840-5
State	Published - Apr 2 1990

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0039-6028(90)90840-5

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@article{073cf42e9d6c46c58b65773723a464e5,

title = "Magnetotransport in a wide parabolic quantum well",

abstract = "Measurements of the magnetoresistance of a high-quality electron system realized in a selectively doped, parabolic AlxGa1-xAs well are reported. Quantum oscillations in the magnetoresistance are analyzed to obtain the electron densities of the electric subbands. These densities are in agreement with the predictions of a self-consistent calculation of the subband structure for this system. With the magnetic field B slightly tilted away from the sample plane, we observe a dramatic manifestation of the subband-Landau-level coupling. At low B, the magnetic depopulation of the hybrid (electric-magnetic) subbands occurs, while at higher fields, Shubnikov-de Haas-like oscillations (periodic in 1 B) are observed as the Fermi level crosses the quantized energy levels associated with the lowest hybrid subband.",

author = "M. Shayegan and T. Sajoto and J. Jo and M. Santos and L. Engel",

note = "Funding Information: Part of this work was performed at the Francis Bitter National Magnet Laboratory, which is supported at MIT by the NSF. We thank H.D. Drew, D.C. Tsui, and K. Karrai for useful discussions and B. Brand& L. Rubin, and J. Moodera for technical assistance. Support of this work by NSF grant nos. ECS-8553110 and DMR-8705002, AR0 Grant No. DAAL03-89-K-0036 and the New Jersey Commission on Science and Technology is acknowledged.",

year = "1990",

month = apr,

day = "2",

doi = "10.1016/0039-6028(90)90840-5",

language = "English (US)",

volume = "229",

pages = "83--87",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "1-3",

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TY - JOUR

T1 - Magnetotransport in a wide parabolic quantum well

AU - Shayegan, M.

AU - Sajoto, T.

AU - Jo, J.

AU - Santos, M.

AU - Engel, L.

N1 - Funding Information: Part of this work was performed at the Francis Bitter National Magnet Laboratory, which is supported at MIT by the NSF. We thank H.D. Drew, D.C. Tsui, and K. Karrai for useful discussions and B. Brand& L. Rubin, and J. Moodera for technical assistance. Support of this work by NSF grant nos. ECS-8553110 and DMR-8705002, AR0 Grant No. DAAL03-89-K-0036 and the New Jersey Commission on Science and Technology is acknowledged.

PY - 1990/4/2

Y1 - 1990/4/2

N2 - Measurements of the magnetoresistance of a high-quality electron system realized in a selectively doped, parabolic AlxGa1-xAs well are reported. Quantum oscillations in the magnetoresistance are analyzed to obtain the electron densities of the electric subbands. These densities are in agreement with the predictions of a self-consistent calculation of the subband structure for this system. With the magnetic field B slightly tilted away from the sample plane, we observe a dramatic manifestation of the subband-Landau-level coupling. At low B, the magnetic depopulation of the hybrid (electric-magnetic) subbands occurs, while at higher fields, Shubnikov-de Haas-like oscillations (periodic in 1 B) are observed as the Fermi level crosses the quantized energy levels associated with the lowest hybrid subband.

AB - Measurements of the magnetoresistance of a high-quality electron system realized in a selectively doped, parabolic AlxGa1-xAs well are reported. Quantum oscillations in the magnetoresistance are analyzed to obtain the electron densities of the electric subbands. These densities are in agreement with the predictions of a self-consistent calculation of the subband structure for this system. With the magnetic field B slightly tilted away from the sample plane, we observe a dramatic manifestation of the subband-Landau-level coupling. At low B, the magnetic depopulation of the hybrid (electric-magnetic) subbands occurs, while at higher fields, Shubnikov-de Haas-like oscillations (periodic in 1 B) are observed as the Fermi level crosses the quantized energy levels associated with the lowest hybrid subband.

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U2 - 10.1016/0039-6028(90)90840-5

DO - 10.1016/0039-6028(90)90840-5

M3 - Article

AN - SCOPUS:0009695920

SN - 0039-6028

VL - 229

SP - 83

EP - 87

JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

Magnetotransport in a wide parabolic quantum well

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All Science Journal Classification (ASJC) codes

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