Quantum Hall effects at Landau level crossings

Yoshiro Hirayama; Koji Muraki; Katsushi Hashimoto; Kei Takashina; Tadashi Saku

doi:10.1016/j.physe.2003.09.030

Quantum Hall effects at Landau level crossings

Yoshiro Hirayama, Koji Muraki, Katsushi Hashimoto, Kei Takashina, Tadashi Saku

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

5 Citations (Scopus)

Abstract

Interesting ferromagnetic characteristics are found in quantum Hall effects when Landau levels (LLs) cross and carrier interaction effects become important at the crossing points. Such LL crossings are studied in bilayer AlGaAs/GaAs systems and silicon quantum wells having a novel valley splitting. Detailed measurements of bilayer ferromagnetism at the LL crossings reveal easy-plane or axis characteristics depending on spin and pseudospin of the crossing states. In the fractional QH regime, interactions between electron and nuclear spins are observed at the crossings of composite-fermion LLs.

Original language	English
Pages (from-to)	133-142
Number of pages	10
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	20
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physe.2003.09.030
Publication status	Published - 2003 Dec 1
Externally published	Yes
Event	Proceedings of the International Symposium at Quantum Hall Effect - Stuttgart, Germany Duration: 2003 Jul 2 → 2003 Jul 5

Keywords

Composite fermion
Electron spin
Landau level
Nuclear spin
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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title = "Quantum Hall effects at Landau level crossings",

abstract = "Interesting ferromagnetic characteristics are found in quantum Hall effects when Landau levels (LLs) cross and carrier interaction effects become important at the crossing points. Such LL crossings are studied in bilayer AlGaAs/GaAs systems and silicon quantum wells having a novel valley splitting. Detailed measurements of bilayer ferromagnetism at the LL crossings reveal easy-plane or axis characteristics depending on spin and pseudospin of the crossing states. In the fractional QH regime, interactions between electron and nuclear spins are observed at the crossings of composite-fermion LLs.",

keywords = "Composite fermion, Electron spin, Landau level, Nuclear spin, Quantum Hall effect",

author = "Yoshiro Hirayama and Koji Muraki and Katsushi Hashimoto and Kei Takashina and Tadashi Saku",

year = "2003",

month = dec,

day = "1",

doi = "10.1016/j.physe.2003.09.030",

language = "English",

volume = "20",

pages = "133--142",

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

issn = "1386-9477",

publisher = "Elsevier",

number = "1-2",

note = "Proceedings of the International Symposium at Quantum Hall Effect ; Conference date: 02-07-2003 Through 05-07-2003",

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TY - JOUR

T1 - Quantum Hall effects at Landau level crossings

AU - Hirayama, Yoshiro

AU - Muraki, Koji

AU - Hashimoto, Katsushi

AU - Takashina, Kei

AU - Saku, Tadashi

PY - 2003/12/1

Y1 - 2003/12/1

N2 - Interesting ferromagnetic characteristics are found in quantum Hall effects when Landau levels (LLs) cross and carrier interaction effects become important at the crossing points. Such LL crossings are studied in bilayer AlGaAs/GaAs systems and silicon quantum wells having a novel valley splitting. Detailed measurements of bilayer ferromagnetism at the LL crossings reveal easy-plane or axis characteristics depending on spin and pseudospin of the crossing states. In the fractional QH regime, interactions between electron and nuclear spins are observed at the crossings of composite-fermion LLs.

AB - Interesting ferromagnetic characteristics are found in quantum Hall effects when Landau levels (LLs) cross and carrier interaction effects become important at the crossing points. Such LL crossings are studied in bilayer AlGaAs/GaAs systems and silicon quantum wells having a novel valley splitting. Detailed measurements of bilayer ferromagnetism at the LL crossings reveal easy-plane or axis characteristics depending on spin and pseudospin of the crossing states. In the fractional QH regime, interactions between electron and nuclear spins are observed at the crossings of composite-fermion LLs.

KW - Composite fermion

KW - Electron spin

KW - Landau level

KW - Nuclear spin

KW - Quantum Hall effect

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U2 - 10.1016/j.physe.2003.09.030

DO - 10.1016/j.physe.2003.09.030

M3 - Conference article

AN - SCOPUS:0345330046

VL - 20

SP - 133

EP - 142

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

SN - 1386-9477

IS - 1-2

T2 - Proceedings of the International Symposium at Quantum Hall Effect

Y2 - 2 July 2003 through 5 July 2003

ER -