Willett R L, Pfeiffer L N, West K W
Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA.
Phys Rev Lett. 2004 Jul 9;93(2):026804. doi: 10.1103/PhysRevLett.93.026804. Epub 2004 Jul 7.
We report experimental transport results in 2D electron systems exposed to dipole radiation up to 20 GHz. Magnetoresistance oscillations occur as seen with higher frequency radiation; however, minima here can be seen to extend to negative biases, and zeros are not observed persistently around sample perimeters. Under radiation, voltages are generated from internal to external contacts in the absence of applied driving currents. These findings may be consistent with theoretical pictures of current instabilities due to local negative resistivities.
我们报告了在高达20 GHz的偶极辐射下二维电子系统中的实验输运结果。正如在更高频率辐射下所观察到的那样，出现了磁阻振荡；然而，这里的最小值可以延伸到负偏压，并且在样品周边周围没有持续观察到零点。在辐射作用下，在没有施加驱动电流的情况下，从内部接触到外部接触会产生电压。这些发现可能与由于局部负电阻率导致的电流不稳定性的理论图景相一致。
