Danckwerts M, Goni AR, Thomsen C, Eberl K, Rojo AG
Institut fur Festkorperphysik, Technische Universitat Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany.
Phys Rev Lett. 2000 Apr 17;84(16):3702-5. doi: 10.1103/PhysRevLett.84.3702.
An enhancement of vortex-motion damping in thin Pb/In superconducting films is obtained through coupling to an adjacent two-dimensional electron gas formed in a modulation-doped GaAs/AlGaAs heterostructure. This effect is observed by monitoring the power dissipation in the superconductor in the vortex state while increasing the density of the electron gas using a gate voltage. Quantitative agreement is found with calculations based on a viscous damping model which considers generation of eddy currents in the electron gas by moving flux lines. In the regime of filamentary vortex flow, eddy-current damping leads to a striking dissipation breakdown due to the stopping of entire vortex channels.
通过与调制掺杂的GaAs/AlGaAs异质结构中形成的相邻二维电子气耦合，在薄Pb/In超导薄膜中实现了涡旋运动阻尼的增强。在使用栅极电压增加电子气密度的同时，通过监测处于涡旋态的超导体中的功率耗散来观察这种效应。基于粘性阻尼模型的计算发现了定量一致性，该模型考虑了移动磁通线在电子气中产生涡电流的情况。在丝状涡旋流区域，涡电流阻尼由于整个涡旋通道的停止而导致显著的耗散击穿。
