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arXiv 1209.0885cond-mat.mes-hallcond-mat.dis-nn
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探测具有可调自旋分裂的门控二维电子气中的温度驱动流线

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

摘要:

我们研究了在门控GaAs二维电子气(2DEG)包含自组装InAs点的电导率的温度流,并与最近的理论预测的结果进行比较。通过改变栅极电压,我们能够调整2DEG密度,从而改变无序和自旋分裂。自旋分辨和自旋简并相变的数据,前者崩溃到后者降低栅极电压和/或减少自旋分裂。实验结果支持了最近的理论,基于模块对称性,该理论预测了临界霍尔电导率如何随自旋分裂而变化。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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