Transport measurements on magnetically coupled superconductor-2D-electron-gas hybrids

We report transport measurements on superconductor-2D-electron-gas (2DEG) hybrid structures performed on both the superconducting and the semiconducting part of the structure to study the magnetic coupling between two systems with dissimilar electronic properties. We observe an enhancement of power dissipation in the hybrid by generation of eddy currents in the nearby 2DEG due to moving vortices in the superconductor. The variation of the 2DEG carrier density with gate voltage, the latter used to tune dissipation, is verified by measuring Shubnikov-de Haas oscillations. Our results show a strong suppression of filamentary and channel vortex flow in the hybrid device, which indicates a strong influence of the normal metal underneath the superconductor on the static and dynamic properties of the vortex lattice. 1