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arXiv · 1209.0885

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

Yi-Ting Wang·Gil-Ho Kim·C. F. Huang·Shun-Tsung Lo·Wei-Jen Chen·J. T. Nicholls·Li-Hung Lin·D. A. Ritchie·Y. H. Chang·C. -T. Liang·B. P. Dolan
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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.

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Yi-Ting Wang, Gil-Ho Kim, C. F. Huang, Shun-Tsung Lo, Wei-Jen Chen, J. T. Nicholls, Li-Hung Lin, D. A. Ritchie, Y. H. Chang, C. -T. Liang, B. P. Dolan. 2012-09-05. Probing temperature-driven flow lines in a gated two-dimensional electron gas with tunable spin-splitting. https://doi.org/10.1088/0953-8984/24/40/405801

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