Observation of magnetic breakdown in double quantum wells

N. E. Harff; J. A. Simmons; J. F. Klem; G. S. Boebinger; L. N. Pfeiffer; K. W. West

doi:10.1006/spmi.1996.0120

Observation of magnetic breakdown in double quantum wells

N. E. Harff
, J. A. Simmons
, J. F. Klem
, G. S. Boebinger
, L. N. Pfeiffer
, K. W. West

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We report on our studies of magnetic breakdown (MB) in coupled GaAs/Al_0.3 Ga_0.7As double quantum wells (DQWs) subject to crossed magnetic fields. MB is a failure of semiclassical theory that occurs when a magnetic field causes electrons to tunnel across a gap in k-space from one Fermi surface (FS) branch to another. We study MB in a two-branch FS created by subjecting a DQW to an in-plane magnetic field (B_∥). The principal effect of B_∥ is a distortion in the dispersion curve of the system, yielding a FS consisting of two components, a lens-shaped inner orbit and an hour-glass-shaped outer orbit. The perpendicular field (B_⊥) causes Landau level formation and Shubnikov-de Haas (SdH) oscillations for each branch of the FS. At higher perpendicular fields MB occurs and electrons tunnel through k-space from one FS orbit to the other. MB is observed by noting which peaks are present in the Fourier power spectrum of the magnetoresistance versus 1/B_⊥ at constant B_∥. We observe MB in two DQW samples over a range of B_∥.

Original language	English (US)
Pages (from-to)	595-600
Number of pages	6
Journal	Superlattices and Microstructures
Volume	20
Issue number	4
DOIs	https://doi.org/10.1006/spmi.1996.0120
State	Published - 1996
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1006/spmi.1996.0120

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title = "Observation of magnetic breakdown in double quantum wells",

abstract = "We report on our studies of magnetic breakdown (MB) in coupled GaAs/Al0.3 Ga0.7As double quantum wells (DQWs) subject to crossed magnetic fields. MB is a failure of semiclassical theory that occurs when a magnetic field causes electrons to tunnel across a gap in k-space from one Fermi surface (FS) branch to another. We study MB in a two-branch FS created by subjecting a DQW to an in-plane magnetic field (B∥). The principal effect of B∥ is a distortion in the dispersion curve of the system, yielding a FS consisting of two components, a lens-shaped inner orbit and an hour-glass-shaped outer orbit. The perpendicular field (B⊥) causes Landau level formation and Shubnikov-de Haas (SdH) oscillations for each branch of the FS. At higher perpendicular fields MB occurs and electrons tunnel through k-space from one FS orbit to the other. MB is observed by noting which peaks are present in the Fourier power spectrum of the magnetoresistance versus 1/B⊥ at constant B∥. We observe MB in two DQW samples over a range of B∥.",

author = "Harff, \{N. E.\} and Simmons, \{J. A.\} and Klem, \{J. F.\} and Boebinger, \{G. S.\} and Pfeiffer, \{L. N.\} and West, \{K. W.\}",

year = "1996",

doi = "10.1006/spmi.1996.0120",

language = "English (US)",

volume = "20",

pages = "595--600",

journal = "Superlattices and Microstructures",

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T1 - Observation of magnetic breakdown in double quantum wells

AU - Harff, N. E.

AU - Simmons, J. A.

AU - Klem, J. F.

AU - Boebinger, G. S.

AU - Pfeiffer, L. N.

AU - West, K. W.

PY - 1996

Y1 - 1996

N2 - We report on our studies of magnetic breakdown (MB) in coupled GaAs/Al0.3 Ga0.7As double quantum wells (DQWs) subject to crossed magnetic fields. MB is a failure of semiclassical theory that occurs when a magnetic field causes electrons to tunnel across a gap in k-space from one Fermi surface (FS) branch to another. We study MB in a two-branch FS created by subjecting a DQW to an in-plane magnetic field (B∥). The principal effect of B∥ is a distortion in the dispersion curve of the system, yielding a FS consisting of two components, a lens-shaped inner orbit and an hour-glass-shaped outer orbit. The perpendicular field (B⊥) causes Landau level formation and Shubnikov-de Haas (SdH) oscillations for each branch of the FS. At higher perpendicular fields MB occurs and electrons tunnel through k-space from one FS orbit to the other. MB is observed by noting which peaks are present in the Fourier power spectrum of the magnetoresistance versus 1/B⊥ at constant B∥. We observe MB in two DQW samples over a range of B∥.

AB - We report on our studies of magnetic breakdown (MB) in coupled GaAs/Al0.3 Ga0.7As double quantum wells (DQWs) subject to crossed magnetic fields. MB is a failure of semiclassical theory that occurs when a magnetic field causes electrons to tunnel across a gap in k-space from one Fermi surface (FS) branch to another. We study MB in a two-branch FS created by subjecting a DQW to an in-plane magnetic field (B∥). The principal effect of B∥ is a distortion in the dispersion curve of the system, yielding a FS consisting of two components, a lens-shaped inner orbit and an hour-glass-shaped outer orbit. The perpendicular field (B⊥) causes Landau level formation and Shubnikov-de Haas (SdH) oscillations for each branch of the FS. At higher perpendicular fields MB occurs and electrons tunnel through k-space from one FS orbit to the other. MB is observed by noting which peaks are present in the Fourier power spectrum of the magnetoresistance versus 1/B⊥ at constant B∥. We observe MB in two DQW samples over a range of B∥.

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U2 - 10.1006/spmi.1996.0120

DO - 10.1006/spmi.1996.0120

M3 - Article

AN - SCOPUS:0030400309

SN - 0749-6036

VL - 20

SP - 595

EP - 600

JO - Superlattices and Microstructures

JF - Superlattices and Microstructures

IS - 4

ER -

Observation of magnetic breakdown in double quantum wells

Abstract

All Science Journal Classification (ASJC) codes

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