Effects of in-plane magnetic fields on spin transitions in bilayer quantum Hall states

N. Kumada; K. Tagashira; K. Iwata; A. Sawada; Z. F. Ezawa; K. Muraki; T. Saku; Y. Hirayama

doi:10.1016/j.physe.2003.11.210

Effects of in-plane magnetic fields on spin transitions in bilayer quantum Hall states

N. Kumada, K. Tagashira, K. Iwata, A. Sawada, Z. F. Ezawa, K. Muraki, T. Saku, Y. Hirayama

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

In a bilayer system, various phase transitions occur due to the competition among the cyclotron, Zeeman and tunneling energies. We investigate effects of an in-plane magnetic field B _∥, which couples subband and Landau levels with the same spin and modulate wave functions extended to both layers, on transitions of quantum Hall states in such a system. As B _∥ is applied, we observe that crossings between opposite spin levels as well as those between the same spin levels disappear in characteristic sequences. While anticrossings of single-particle levels are sufficient to explain the observed behavior for crossings at ν=4, the data at ν=6 are not understood in a single-particle picture, and suggest Coulomb-induced mixing of different spin levels.

Original language	English
Pages (from-to)	36-39
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	22
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physe.2003.11.210
Publication status	Published - 2004 Apr
Externally published	Yes
Event	15th International Conference on ELectronic Propreties - Nara, Japan Duration: 2003 Jul 14 → 2003 Jul 18

Keywords

GaAs/AlGaAs
Phase transition
Quantum hall effect

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1016/j.physe.2003.11.210

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title = "Effects of in-plane magnetic fields on spin transitions in bilayer quantum Hall states",

abstract = "In a bilayer system, various phase transitions occur due to the competition among the cyclotron, Zeeman and tunneling energies. We investigate effects of an in-plane magnetic field B ∥, which couples subband and Landau levels with the same spin and modulate wave functions extended to both layers, on transitions of quantum Hall states in such a system. As B ∥ is applied, we observe that crossings between opposite spin levels as well as those between the same spin levels disappear in characteristic sequences. While anticrossings of single-particle levels are sufficient to explain the observed behavior for crossings at ν=4, the data at ν=6 are not understood in a single-particle picture, and suggest Coulomb-induced mixing of different spin levels.",

keywords = "GaAs/AlGaAs, Phase transition, Quantum hall effect",

author = "N. Kumada and K. Tagashira and K. Iwata and A. Sawada and Ezawa, {Z. F.} and K. Muraki and T. Saku and Y. Hirayama",

note = "Funding Information: The research was supported in part of Grant-in Aids for the Scientific Research from the Ministry of Education, Science, Sports and Culture (Nos. 14340088, 13008159), CREST-JST.; 15th International Conference on ELectronic Propreties ; Conference date: 14-07-2003 Through 18-07-2003",

year = "2004",

month = apr,

doi = "10.1016/j.physe.2003.11.210",

language = "English",

volume = "22",

pages = "36--39",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Effects of in-plane magnetic fields on spin transitions in bilayer quantum Hall states

AU - Kumada, N.

AU - Tagashira, K.

AU - Iwata, K.

AU - Sawada, A.

AU - Ezawa, Z. F.

AU - Muraki, K.

AU - Saku, T.

AU - Hirayama, Y.

N1 - Funding Information: The research was supported in part of Grant-in Aids for the Scientific Research from the Ministry of Education, Science, Sports and Culture (Nos. 14340088, 13008159), CREST-JST.

PY - 2004/4

Y1 - 2004/4

N2 - In a bilayer system, various phase transitions occur due to the competition among the cyclotron, Zeeman and tunneling energies. We investigate effects of an in-plane magnetic field B ∥, which couples subband and Landau levels with the same spin and modulate wave functions extended to both layers, on transitions of quantum Hall states in such a system. As B ∥ is applied, we observe that crossings between opposite spin levels as well as those between the same spin levels disappear in characteristic sequences. While anticrossings of single-particle levels are sufficient to explain the observed behavior for crossings at ν=4, the data at ν=6 are not understood in a single-particle picture, and suggest Coulomb-induced mixing of different spin levels.

AB - In a bilayer system, various phase transitions occur due to the competition among the cyclotron, Zeeman and tunneling energies. We investigate effects of an in-plane magnetic field B ∥, which couples subband and Landau levels with the same spin and modulate wave functions extended to both layers, on transitions of quantum Hall states in such a system. As B ∥ is applied, we observe that crossings between opposite spin levels as well as those between the same spin levels disappear in characteristic sequences. While anticrossings of single-particle levels are sufficient to explain the observed behavior for crossings at ν=4, the data at ν=6 are not understood in a single-particle picture, and suggest Coulomb-induced mixing of different spin levels.

KW - GaAs/AlGaAs

KW - Phase transition

KW - Quantum hall effect

UR - http://www.scopus.com/inward/record.url?scp=1842684891&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1842684891&partnerID=8YFLogxK

U2 - 10.1016/j.physe.2003.11.210

DO - 10.1016/j.physe.2003.11.210

M3 - Conference article

AN - SCOPUS:1842684891

SN - 1386-9477

VL - 22

SP - 36

EP - 39

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-3

T2 - 15th International Conference on ELectronic Propreties

Y2 - 14 July 2003 through 18 July 2003

ER -

Effects of in-plane magnetic fields on spin transitions in bilayer quantum Hall states

Abstract

Keywords

ASJC Scopus subject areas

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