Activation studies of pseudospin quantum Hall ferromagnets in double quantum wells

Koji Muraki; Tadashi Saku; Yoshiro Hirayama

doi:10.1016/S1386-9477(01)00261-2

Activation studies of pseudospin quantum Hall ferromagnets in double quantum wells

Koji Muraki, Tadashi Saku, Yoshiro Hirayama

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

6 Citations (Scopus)

Abstract

We study pseudospin quantum Hall ferromagnets realized in a strongly coupled double-quantum-well structure. The pseudospin dependence of the Coulomb interactions leads to magnetic anisotropy. Activation energies measured as a function of the single-particle gap, i.e. the pseudospin Zeeman energy, reveal a striking difference between the easy-axis and easy-plane ferromagnets. In the limit of zero single-particle gap, we observe a novel low-energy excitation, reminiscent of Skyrmions, for the ν = 4 easy-axis ferromagnet. We discuss the reduced gap in terms of topological charge excitations in the domain walls.

Original language	English
Pages (from-to)	8-11
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	12
Issue number	1-4
DOIs	https://doi.org/10.1016/S1386-9477(01)00261-2
Publication status	Published - 2002 Jan
Externally published	Yes
Event	14th International Conference on the - Prague, Czech Republic Duration: 2001 Jul 30 → 2001 Aug 3

Keywords

Bilayer electron system
Domain wall
Ising spin
Quantum Hall effect
Quantum Hall ferromagnet
Skyrmion

ASJC Scopus subject areas

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

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10.1016/S1386-9477(01)00261-2

Cite this

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title = "Activation studies of pseudospin quantum Hall ferromagnets in double quantum wells",

abstract = "We study pseudospin quantum Hall ferromagnets realized in a strongly coupled double-quantum-well structure. The pseudospin dependence of the Coulomb interactions leads to magnetic anisotropy. Activation energies measured as a function of the single-particle gap, i.e. the pseudospin Zeeman energy, reveal a striking difference between the easy-axis and easy-plane ferromagnets. In the limit of zero single-particle gap, we observe a novel low-energy excitation, reminiscent of Skyrmions, for the ν = 4 easy-axis ferromagnet. We discuss the reduced gap in terms of topological charge excitations in the domain walls.",

keywords = "Bilayer electron system, Domain wall, Ising spin, Quantum Hall effect, Quantum Hall ferromagnet, Skyrmion",

author = "Koji Muraki and Tadashi Saku and Yoshiro Hirayama",

note = "Funding Information: The authors are indebted to Z.F. Ezawa, A. Sawada, and N. Kumada for useful discussions. Part of this work was supported by NEDO international joint research NTDP-98.; 14th International Conference on the ; Conference date: 30-07-2001 Through 03-08-2001",

year = "2002",

month = jan,

doi = "10.1016/S1386-9477(01)00261-2",

language = "English",

volume = "12",

pages = "8--11",

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

issn = "1386-9477",

publisher = "Elsevier",

number = "1-4",

}

TY - JOUR

T1 - Activation studies of pseudospin quantum Hall ferromagnets in double quantum wells

AU - Muraki, Koji

AU - Saku, Tadashi

AU - Hirayama, Yoshiro

N1 - Funding Information: The authors are indebted to Z.F. Ezawa, A. Sawada, and N. Kumada for useful discussions. Part of this work was supported by NEDO international joint research NTDP-98.

PY - 2002/1

Y1 - 2002/1

N2 - We study pseudospin quantum Hall ferromagnets realized in a strongly coupled double-quantum-well structure. The pseudospin dependence of the Coulomb interactions leads to magnetic anisotropy. Activation energies measured as a function of the single-particle gap, i.e. the pseudospin Zeeman energy, reveal a striking difference between the easy-axis and easy-plane ferromagnets. In the limit of zero single-particle gap, we observe a novel low-energy excitation, reminiscent of Skyrmions, for the ν = 4 easy-axis ferromagnet. We discuss the reduced gap in terms of topological charge excitations in the domain walls.

AB - We study pseudospin quantum Hall ferromagnets realized in a strongly coupled double-quantum-well structure. The pseudospin dependence of the Coulomb interactions leads to magnetic anisotropy. Activation energies measured as a function of the single-particle gap, i.e. the pseudospin Zeeman energy, reveal a striking difference between the easy-axis and easy-plane ferromagnets. In the limit of zero single-particle gap, we observe a novel low-energy excitation, reminiscent of Skyrmions, for the ν = 4 easy-axis ferromagnet. We discuss the reduced gap in terms of topological charge excitations in the domain walls.

KW - Bilayer electron system

KW - Domain wall

KW - Ising spin

KW - Quantum Hall effect

KW - Quantum Hall ferromagnet

KW - Skyrmion

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UR - http://www.scopus.com/inward/citedby.url?scp=0035239420&partnerID=8YFLogxK

U2 - 10.1016/S1386-9477(01)00261-2

DO - 10.1016/S1386-9477(01)00261-2

M3 - Conference article

AN - SCOPUS:0035239420

SN - 1386-9477

VL - 12

SP - 8

EP - 11

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-4

T2 - 14th International Conference on the

Y2 - 30 July 2001 through 3 August 2001

ER -

Activation studies of pseudospin quantum Hall ferromagnets in double quantum wells

Abstract

Keywords

ASJC Scopus subject areas

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