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arXiv 1208.4838cond-mat.mes-hall
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GaAs量子阱中重叠和分离朗道能级的非线性响应

Nonlinear response in overlapping and separated Landau levels of GaAs quantum wells

A. T. Hatke, M. A. Zudov, L. N. Pfeiffer, K. W. West

摘要:

研究了高迁移率二维电子系统在弱电场作用下的磁输运性质。在低磁场$B$下,微分电阻率获得校正$δr \propto -λ^2 j^2/B^2$,其中$λ$是丁格尔因子,$j$是电流密度,与理论预测一致。然而,在更高的磁场下,$δr$变成$B$独立的,即$δr \propto -j^2$ .虽然观察到的行为变化可以归因于从重叠到分离的朗道能级的交叉,但对这种行为的充分理解仍然是未来理论的主题。

英文摘要:

We have studied magnetotransport properties of a high-mobility two-dimensional electron system subject to weak electric fields. At low magnetic field $B$, the differential resistivity acquires a correction $δr \propto -λ^2 j^2/B^2$, where $λ$ is the Dingle factor and $j$ is the current density, in agreement with theoretical predictions. At higher magnetic fields, however, $δr$ becomes $B$-independent, $δr \propto -j^2$. While the observed change in behavior can be attributed to a crossover from overlapping to separated Landau levels, full understanding of this behavior remains a subject of future theories.

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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