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Title: Single-valley quantum Hall ferromagnet in a dilute Mg xZn 1-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 Mg xZn 1-xO/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g*m*, dominated by the increase in the Landé 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.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1099093
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 85 Journal Issue: 7; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Kozuka, Y., Tsukazaki, A., Maryenko, D., Falson, J., Bell, C., Kim, M., Hikita, Y., Hwang, H. Y., and Kawasaki, M. Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system. United States: N. p., 2012. Web. doi:10.1103/PhysRevB.85.075302.
Kozuka, Y., Tsukazaki, A., Maryenko, D., Falson, J., Bell, C., Kim, M., Hikita, Y., Hwang, H. Y., & Kawasaki, M. Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system. United States. doi:10.1103/PhysRevB.85.075302.
Kozuka, Y., Tsukazaki, A., Maryenko, D., Falson, J., Bell, C., Kim, M., Hikita, Y., Hwang, H. Y., and Kawasaki, M. Fri . "Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system". United States. doi:10.1103/PhysRevB.85.075302.
@article{osti_1099093,
title = {Single-valley quantum Hall ferromagnet in a dilute MgxZn1-xO/ZnO strongly correlated two-dimensional electron system},
author = {Kozuka, Y. and Tsukazaki, A. and Maryenko, D. and Falson, J. and Bell, C. and Kim, M. and Hikita, Y. and Hwang, H. Y. and Kawasaki, M.},
abstractNote = {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 Landé 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.},
doi = {10.1103/PhysRevB.85.075302},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 7,
volume = 85,
place = {United States},
year = {2012},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevB.85.075302

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Cited by: 24 works
Citation information provided by
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