Valley susceptibility of interacting electrons and composite fermions

N. C. Bishop; M. Padmanabhan; O. Gunawan; T. Gokmen; E. P. De Poortere; Y. P. Shkolnikov; E. Tutuc; K. Vakili; M. Shayegan

doi:10.1016/j.physe.2007.08.067

Valley susceptibility of interacting electrons and composite fermions

N. C. Bishop, M. Padmanabhan, O. Gunawan, T. Gokmen, E. P. De Poortere, Y. P. Shkolnikov, E. Tutuc, K. Vakili, M. Shayegan

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

3 Scopus citations

Abstract

We report magnetotransport measurements of integer and fractional quantum Hall states in an AlAs quantum well where two conduction band valleys are occupied. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the "valley susceptibility" (the change of valley population with strain) for both electrons and composite Fermions. The data reveal that these valley susceptibilities are significantly enhanced over the band values, reflecting the role of strong interaction. Moreover, the measured valley susceptibilities are quite similar to the values of spin susceptibility, establishing the analogy between the spin and valley degrees of freedom.

Original language	English (US)
Pages (from-to)	986-989
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	40
Issue number	5
DOIs	https://doi.org/10.1016/j.physe.2007.08.067
State	Published - Mar 2008

All Science Journal Classification (ASJC) codes

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

Keywords

Composite fermion
Multi-valley semi-conductor
Valley susceptibility

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10.1016/j.physe.2007.08.067

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@article{5fe50b8fa0e84477be659550cfc31115,

title = "Valley susceptibility of interacting electrons and composite fermions",

abstract = "We report magnetotransport measurements of integer and fractional quantum Hall states in an AlAs quantum well where two conduction band valleys are occupied. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the {"}valley susceptibility{"} (the change of valley population with strain) for both electrons and composite Fermions. The data reveal that these valley susceptibilities are significantly enhanced over the band values, reflecting the role of strong interaction. Moreover, the measured valley susceptibilities are quite similar to the values of spin susceptibility, establishing the analogy between the spin and valley degrees of freedom.",

keywords = "Composite fermion, Multi-valley semi-conductor, Valley susceptibility",

author = "Bishop, {N. C.} and M. Padmanabhan and O. Gunawan and T. Gokmen and {De Poortere}, {E. P.} and Shkolnikov, {Y. P.} and E. Tutuc and K. Vakili and M. Shayegan",

note = "Funding Information: We thank the NSF for financial support and J.K. Jain for helpful discussions. Part of our work was performed at the Florida NHMFL also supported by the NSF; we thank E. Palm, T. Murphy, J. Jaroszynski, S. Hannahs, and G. Jones for assistance. ",

year = "2008",

month = mar,

doi = "10.1016/j.physe.2007.08.067",

language = "English (US)",

volume = "40",

pages = "986--989",

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

issn = "1386-9477",

publisher = "Elsevier B.V.",

number = "5",

}

TY - JOUR

T1 - Valley susceptibility of interacting electrons and composite fermions

AU - Bishop, N. C.

AU - Padmanabhan, M.

AU - Gunawan, O.

AU - Gokmen, T.

AU - De Poortere, E. P.

AU - Shkolnikov, Y. P.

AU - Tutuc, E.

AU - Vakili, K.

AU - Shayegan, M.

N1 - Funding Information: We thank the NSF for financial support and J.K. Jain for helpful discussions. Part of our work was performed at the Florida NHMFL also supported by the NSF; we thank E. Palm, T. Murphy, J. Jaroszynski, S. Hannahs, and G. Jones for assistance.

PY - 2008/3

Y1 - 2008/3

N2 - We report magnetotransport measurements of integer and fractional quantum Hall states in an AlAs quantum well where two conduction band valleys are occupied. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the "valley susceptibility" (the change of valley population with strain) for both electrons and composite Fermions. The data reveal that these valley susceptibilities are significantly enhanced over the band values, reflecting the role of strong interaction. Moreover, the measured valley susceptibilities are quite similar to the values of spin susceptibility, establishing the analogy between the spin and valley degrees of freedom.

AB - We report magnetotransport measurements of integer and fractional quantum Hall states in an AlAs quantum well where two conduction band valleys are occupied. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the "valley susceptibility" (the change of valley population with strain) for both electrons and composite Fermions. The data reveal that these valley susceptibilities are significantly enhanced over the band values, reflecting the role of strong interaction. Moreover, the measured valley susceptibilities are quite similar to the values of spin susceptibility, establishing the analogy between the spin and valley degrees of freedom.

KW - Composite fermion

KW - Multi-valley semi-conductor

KW - Valley susceptibility

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UR - http://www.scopus.com/inward/citedby.url?scp=39749106563&partnerID=8YFLogxK

U2 - 10.1016/j.physe.2007.08.067

DO - 10.1016/j.physe.2007.08.067

M3 - Article

AN - SCOPUS:39749106563

SN - 1386-9477

VL - 40

SP - 986

EP - 989

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 5

ER -

Valley susceptibility of interacting electrons and composite fermions

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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