The fate of quantum Hall extended states as B → 0 and the possibility of a 2D metal

C. E. Yasin; M. Y. Simmons; A. R. Hamilton; N. E. Lumpkin; R. G. Clark; L. N. Pfeiffer; K. W. West

doi:10.1016/S1386-9477(01)00421-0

The fate of quantum Hall extended states as B → 0 and the possibility of a 2D metal

C. E. Yasin, M. Y. Simmons, A. R. Hamilton, N. E. Lumpkin, R. G. Clark, L. N. Pfeiffer, K. W. West

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

3 Scopus citations

Abstract

We report the study of two-dimensional 'metallic' behaviour at B = 0 in ultra-high-quality n-GaAs (μ_peak > 10⁷ cm² V^-1 s^-1), and in particular address the question of what happens to the quantum Hall extended states at the centre of Landau levels as B → 0. In these high-quality electron samples we can reach extremely low carrier densities (2 × 10⁹ cm^-2), allowing us to track the extended states down to very low magnetic fields (down to ∼ 0.05 T). Our result suggests that as B → 0 the extended states float up in energy as predicted by the scaling theory of localisation.

Original language	English (US)
Pages (from-to)	646-649
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)00421-0
State	Published - Jan 2002
Externally published	Yes
Event	14th International Conference on the - Prague, Czech Republic Duration: Jul 30 2001 → Aug 3 2001

All Science Journal Classification (ASJC) codes

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

Keywords

Metal-insulator transition
Quantum Hall effect

Access to Document

10.1016/S1386-9477(01)00421-0

Cite this

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title = "The fate of quantum Hall extended states as B → 0 and the possibility of a 2D metal",

abstract = "We report the study of two-dimensional 'metallic' behaviour at B = 0 in ultra-high-quality n-GaAs (μpeak > 107 cm2 V-1 s-1), and in particular address the question of what happens to the quantum Hall extended states at the centre of Landau levels as B → 0. In these high-quality electron samples we can reach extremely low carrier densities (2 × 109 cm-2), allowing us to track the extended states down to very low magnetic fields (down to ∼ 0.05 T). Our result suggests that as B → 0 the extended states float up in energy as predicted by the scaling theory of localisation.",

keywords = "Metal-insulator transition, Quantum Hall effect",

author = "Yasin, {C. E.} and Simmons, {M. Y.} and Hamilton, {A. R.} and Lumpkin, {N. E.} and Clark, {R. G.} and Pfeiffer, {L. N.} and West, {K. W.}",

year = "2002",

month = jan,

doi = "10.1016/S1386-9477(01)00421-0",

language = "English (US)",

volume = "12",

pages = "646--649",

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

issn = "1386-9477",

publisher = "Elsevier B.V.",

number = "1-4",

note = "14th International Conference on the ; Conference date: 30-07-2001 Through 03-08-2001",

}

TY - JOUR

T1 - The fate of quantum Hall extended states as B → 0 and the possibility of a 2D metal

AU - Yasin, C. E.

AU - Simmons, M. Y.

AU - Hamilton, A. R.

AU - Lumpkin, N. E.

AU - Clark, R. G.

AU - Pfeiffer, L. N.

AU - West, K. W.

PY - 2002/1

Y1 - 2002/1

N2 - We report the study of two-dimensional 'metallic' behaviour at B = 0 in ultra-high-quality n-GaAs (μpeak > 107 cm2 V-1 s-1), and in particular address the question of what happens to the quantum Hall extended states at the centre of Landau levels as B → 0. In these high-quality electron samples we can reach extremely low carrier densities (2 × 109 cm-2), allowing us to track the extended states down to very low magnetic fields (down to ∼ 0.05 T). Our result suggests that as B → 0 the extended states float up in energy as predicted by the scaling theory of localisation.

AB - We report the study of two-dimensional 'metallic' behaviour at B = 0 in ultra-high-quality n-GaAs (μpeak > 107 cm2 V-1 s-1), and in particular address the question of what happens to the quantum Hall extended states at the centre of Landau levels as B → 0. In these high-quality electron samples we can reach extremely low carrier densities (2 × 109 cm-2), allowing us to track the extended states down to very low magnetic fields (down to ∼ 0.05 T). Our result suggests that as B → 0 the extended states float up in energy as predicted by the scaling theory of localisation.

KW - Metal-insulator transition

KW - Quantum Hall effect

UR - http://www.scopus.com/inward/record.url?scp=0035239542&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035239542&partnerID=8YFLogxK

U2 - 10.1016/S1386-9477(01)00421-0

DO - 10.1016/S1386-9477(01)00421-0

M3 - Conference article

AN - SCOPUS:0035239542

SN - 1386-9477

VL - 12

SP - 646

EP - 649

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 -

The fate of quantum Hall extended states as B → 0 and the possibility of a 2D metal

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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