Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system

Y. Kozuka; A. Tsukazaki; D. Maryenko; J. Falson; C. Bell; M. Kim; Y. Hikita; H. Y. Hwang; M. Kawasaki; Chris Bell

doi:10.1103/PhysRevB.85.075302

Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system

Y. Kozuka^*, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, M. Kawasaki, Chris Bell

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

29 Citations (Scopus)

Abstract

We investigate the spin susceptibility (g*m*) of dilute two-dimensional (2D) electrons confined at the MgxZn1-xO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Lande g-factor. The g-factor enhancement leads to a ferromagnetic instability of the electron gas as evidenced by sharp resistance spikes. At high magnetic field, the large g*m* leads to full spin polarization, where we found sudden increase in resistance around the filling factors of half-integer, accompanied by complete disappearance of fractional quantum Hall (QH) states. Along with its large effective mass and the high electron mobility, our result indicates that the ZnO 2D system is ideal for investigating the effect of electron correlations in the QH regime.

Original language	English
Article number	075302
Number of pages	5
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	85
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.85.075302
Publication status	Published - 3 Feb 2012

Keywords

METAL-INSULATOR-TRANSITION
2 DIMENSIONS
GAS

Access to Document

10.1103/PhysRevB.85.075302

Cite this

@article{74815cad47014137bd5da27190a04ee4,

title = "Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system",

abstract = "We investigate the spin susceptibility (g*m*) of dilute two-dimensional (2D) electrons confined at the MgxZn1-xO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Lande g-factor. The g-factor enhancement leads to a ferromagnetic instability of the electron gas as evidenced by sharp resistance spikes. At high magnetic field, the large g*m* leads to full spin polarization, where we found sudden increase in resistance around the filling factors of half-integer, accompanied by complete disappearance of fractional quantum Hall (QH) states. Along with its large effective mass and the high electron mobility, our result indicates that the ZnO 2D system is ideal for investigating the effect of electron correlations in the QH regime.",

keywords = "METAL-INSULATOR-TRANSITION, 2 DIMENSIONS, GAS",

author = "Y. Kozuka and A. Tsukazaki and D. Maryenko and J. Falson and C. Bell and M. Kim and Y. Hikita and Hwang, {H. Y.} and M. Kawasaki and Chris Bell",

year = "2012",

month = feb,

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doi = "10.1103/PhysRevB.85.075302",

language = "English",

volume = "85",

journal = "Physical Review B: Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society (APS)",

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Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system. / Kozuka, Y.; Tsukazaki, A.; Maryenko, D.; Falson, J.; Bell, C.; Kim, M.; Hikita, Y.; Hwang, H. Y.; Kawasaki, M.; Bell, Chris.

In: Physical Review B: Condensed Matter and Materials Physics, Vol. 85, No. 7, 075302, 03.02.2012.

Research output: Contribution to journal › Article (Academic Journal) › peer-review

TY - JOUR

T1 - Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system

AU - Kozuka, Y.

AU - Tsukazaki, A.

AU - Maryenko, D.

AU - Falson, J.

AU - Bell, C.

AU - Kim, M.

AU - Hikita, Y.

AU - Hwang, H. Y.

AU - Kawasaki, M.

AU - Bell, Chris

PY - 2012/2/3

Y1 - 2012/2/3

N2 - We investigate the spin susceptibility (g*m*) of dilute two-dimensional (2D) electrons confined at the MgxZn1-xO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Lande g-factor. The g-factor enhancement leads to a ferromagnetic instability of the electron gas as evidenced by sharp resistance spikes. At high magnetic field, the large g*m* leads to full spin polarization, where we found sudden increase in resistance around the filling factors of half-integer, accompanied by complete disappearance of fractional quantum Hall (QH) states. Along with its large effective mass and the high electron mobility, our result indicates that the ZnO 2D system is ideal for investigating the effect of electron correlations in the QH regime.

AB - We investigate the spin susceptibility (g*m*) of dilute two-dimensional (2D) electrons confined at the MgxZn1-xO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Lande g-factor. The g-factor enhancement leads to a ferromagnetic instability of the electron gas as evidenced by sharp resistance spikes. At high magnetic field, the large g*m* leads to full spin polarization, where we found sudden increase in resistance around the filling factors of half-integer, accompanied by complete disappearance of fractional quantum Hall (QH) states. Along with its large effective mass and the high electron mobility, our result indicates that the ZnO 2D system is ideal for investigating the effect of electron correlations in the QH regime.

KW - METAL-INSULATOR-TRANSITION

KW - 2 DIMENSIONS

KW - GAS

U2 - 10.1103/PhysRevB.85.075302

DO - 10.1103/PhysRevB.85.075302

M3 - Article (Academic Journal)

VL - 85

JO - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

SN - 1098-0121

IS - 7

M1 - 075302

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