title: Enhanced vortex damping by eddy currents in superconductor-semiconductor hybrids
abstract: 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.
authors.affiliation: Institut fur Festkorperphysik, Technische Universitat Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany.
authors.initials: M
authors.lastname: Danckwerts
authors.initials: AR
authors.lastname: Goni
authors.initials: C
authors.lastname: Thomsen
authors.initials: K
authors.lastname: Eberl
authors.initials: AG
authors.lastname: Rojo