Density dependence of microwave induced magnetoresistance oscillations in a two-dimensional electron gas
Density dependence of microwave induced magnetoresistance oscillations in a two-dimensional electron gas
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DOI：
10.1103/physrevb.71.233303
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发表时间：
2005-02
影响因子：
3.7
通讯作者：
B. Simovič;C. Ellenberger;K. Ensslin;H. Tranitz;W. Wegscheider
中科院分区：
文献类型：
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作者：
B. Simovič;C. Ellenberger;K. Ensslin;H. Tranitz;W. Wegscheider
我们已经测量了连续微波照射下的二维电子气（2DEG）的磁阻作为电子密度和迁移率的函数与金属顶栅调谐。在整个范围内的密度和流动性，我们已经调查，我们观察到微波诱导的大振幅的振荡是B-周期性的。这些B周期振荡让人想起Kukushkin等人[Phys. Rev. Lett. 92，236803（2004）]，并归因于边缘磁等离子体的存在。我们发现，在我们的样品中，B周期并不随密度线性增加，而是在（2.4-3）×1011 cm−2范围内显示出一个平台。在这个制度中，B-周期振荡的相位被发现连续移动两个周期。
We have measured the magnetoresistance of a two-dimensional electron gas (2DEG) under continuous microwave irradiation as a function of electron density and mobility tuned with a metallic top-gate. In the entire range of density and mobility we have investigated, we observe microwave induced oscillations of large amplitude that are B-periodic. These B-periodic oscillations are reminiscent of the ones reported by Kukushkin et al. [Phys. Rev. Lett. 92, 236803 (2004)] and which were attributed to the presence of edge-magneto-plasmons. We have found that the B-periodicity does not increase linearly with the density in our sample but shows a plateau in the range (2.4–3)×1011 cm−2. In this regime, the phase of the B-periodic oscillations is found to shift continuously by two periods.