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    Probing temperature-driven flow lines in a gated two-dimensional electron gas with tunable spin-splitting


    Wang, Yi-Ting and Kim, Gil-Ho and Huang, C. F. and Lo, Shun-Tsung and Chen, Wei-Jen and Nicholls, J.T, and Lin, Li-Hung and Richie, D.A. and Chang, Y.H. and Liang, C.T. and Dolan, Brian P. (2012) Probing temperature-driven flow lines in a gated two-dimensional electron gas with tunable spin-splitting. Journal of Physics: Condensed Matter, 24 (405801). ISSN 0953-8984

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    Abstract

    We study the temperature flow of conductivities in a gated GaAs two-dimensional electron gas (2DEG) containing self-assembled InAs dots and compare the results with recent theoretical predictions. By changing the gate voltage, we are able to tune the 2DEG density and thus vary disorder and spin-splitting. Data for both the spin-resolved and spin-degenerate phase transitions are presented, the former collapsing to the latter with decreasing gate voltage and/or decreasing spin-splitting. The experimental results support a recent theory, based on modular symmetry, which predicts how the critical Hall conductivity varies with spin-splitting.

    Item Type: Article
    Keywords: temperature-driven flow lines; gated two-dimensional electron gas; tunable spin-splitting;
    Academic Unit: Faculty of Science and Engineering > Mathematical Physics
    Item ID: 4243
    Depositing User: Dr. Brian Dolan
    Date Deposited: 11 Mar 2013 16:22
    Journal or Publication Title: Journal of Physics: Condensed Matter
    Publisher: Institute of Physics
    Refereed: Yes
    URI:

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