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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Effect of a dc electric field on the longitudinal resistance of two-dimensional electrons in a magnetic field
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Effect of a dc electric field on the longitudinal resistance of two-dimensional electrons in a magnetic field

机译：直流电场对磁场中二维电子的纵向电阻的影响

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摘要

The effect of a dc electric field on the longitudinal resistance of highly mobile two-dimensional (2D) electrons in heavily doped GaAs quantum wells is studied at different magnetic fields and temperatures. Strong suppression of the resistance by the electric field is observed in magnetic fields at which the Landau quantization of electron motion occurs. The phenomenon survives at high temperature where Shubnikov-de Haas oscillations are absent. The scale of the electric fields essential for the effect is found to be proportional to temperature in the low temperature limit. We suggest that the strong reduction of the longitudinal resistance is the result of a nontrivial change in the distribution function of 2D electrons induced by the dc electric field. Comparison of the data with recent theory yields the inelastic electron-electon scattering time τ_(in) and the quantum scattering time τ_q of the electrons at high temperatures, a regime where previous methods were not successful.
机译：研究了在不同磁场和温度下，直流电场对高掺杂GaAs量子阱中高迁移率二维（2D）电子的纵向电阻的影响。在发生电子运动的朗道量化的磁场中，观察到电场对电阻的强烈抑制。该现象在不存在Shubnikov-de Haas振荡的高温下仍然存在。在低温极限条件下，发现对于这种作用必不可少的电场的大小与温度成正比。我们认为，纵向电阻的强烈降低是由直流电场引起的二维电子分布函数的平凡变化的结果。将数据与最新理论进行比较可得出在高温下电子的非弹性电子-电子散射时间τ_（in）和量子散射时间τ_q，而先前的方法并不成功。

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