Direct measurement of the spin gaps in a gated GaAs two-dimensional electron gas

被引：0
作者：
Tsai-Yu Huang
Chi-Te Liang
Yang Fang Chen
Michelle Y Simmons
Gil-Ho Kim
David A Ritchie
机构：
[1] National Taiwan University,Department of Physics
[2] University of New South Wales,School of Physics
[3] Sungkyunkwan University,School of Electronic and Electrical Engineering
[4] J. J. Thomson Avenue,Cavendish Laboratory
来源：
Nanoscale Research Letters | / 8卷
关键词：
Spin; g-factor; Disorder;
D O I：
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摘要：
We have performed magnetotransport measurements on gated GaAs two-dimensional electron gases in which electrons are confined in a layer of the nanoscale. From the slopes of a pair of spin-split Landau levels (LLs) in the energy-magnetic field plane, we can perform direct measurements of the spin gap for different LLs. The measured g-factor g is greatly enhanced over its bulk value in GaAs (0.44) due to electron–electron (e-e) interactions. Our results suggest that both the spin gap and g determined from conventional activation energy studies can be very different from those obtained by direct measurements.
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[11]  
Kurebayashi H(1988)Effects of a tilted magnetic field on a two-dimensional electron gas Phys Rev B 77 1294-undefined
[12]  
Farrer I(2000) Factors for an interacting electron gas Phys Rev B 61 10910-undefined
[13]  
de Groot CH(1996)Exchange enhancement of the spin splitting in a GaAs-Ga Phys Rev Lett 77 135-undefined
[14]  
Leadley DR(2011)Al Nanoscale Res Lett 6 131-undefined
[15]  
Bell G(1990)As heterojunction Phys Rev Lett 65 907-undefined
[16]  
Parker EHC(1995)Tuning the insulator-quantum Hall liquid transitions in a two-dimensional electron gas using self-assembled InAs Phys Rev Lett 74 594-undefined
[17]  
Whall T(2007)Possible spin polarization in a one-dimensional electron gas Phys Rev B 76 201306(R)-undefined
[18]  
Ritchie DA(2000)On the direct insulator-quantum Hall transition in two-dimensional electron systems in the vicinity of nanoscaled scatterers J Appl Phys 88 932-undefined
[19]  
Barnes CHW(2004)Nature of the extended states in the fractional quantum Hall effect J Appl Phys 96 7370-undefined
[20]  
Watson SK(2002)Fate of the delocalized states in a vanishing magnetic field Phys Rev Lett 88 036805-undefined
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