Andreev reflection and enhanced subgap conductance in NbN/Au/InGaAs-InP junctions
arXiv:cond-mat/0309682 · doi:10.1063/1.1783612
Abstract
We report on the fabrication of highly transparent superconductor/normal metal/two-dimensional electron gas junctions formed by a superconducting NbN electrode, a thin (10nm) Au interlayer, and a two-dimensional electron gas in a InGaAs/InP heterostructure. High junction transparency has been achieved by exploiting of a newly developed process of Au/NbN evaporation and rapid annealing at 400C. This allowed us to observe for the first time a decrease in the differential resistance with pronounced double-dip structure within the superconducting energy gap in superconductor-2DEG proximity systems. The effect of a magnetic field perpendicular to the plane of the 2DEG on the differential resistance of the interface was studied. It has been found that the reduced subgap resistance remains in high magnetic fields. Zero-field data are analyzed within the previously established quasiclassical model for the proximity effect.
arXiv comment15 pages, 5 figures
References in corpus (16)
- Quasiclassical Green's function approach to mesoscopic superconductivity
- Interference of two electrons entering a superconductor
- Diffusive conductors as Andreev interferometers
- Re-entrance of the metallic conductance in a mesoscopic proximity superconductor
- Induced superconductivity distinguishes chaotic from integrable billiards
- Coherent Charge Transport in Metallic Proximity Structures
- Andreev Reflection in Strong Magnetic Fields
- Scaling Theory of Conduction Through a Normal-Superconductor Microbridge
- Circuit theory of multiple Andreev reflections in diffusive SNS junctions: the incoherent case
- Nonlinearity in NS transport: scattering matrix approach
- Magnetoconductance Oscillations in Ballistic Semiconductor-Superconductor Junctions
- Magnetic field influence on the proximity effect in semiconductor - superconductor hybrid structures and their thermal conductance
- Long-range coherence and mesoscopic transport in N-S metallic structures
- Conductance of a Semiconductor-Superconductor junction in high magnetic field
- Mesoscopic proximity effect in double barrier Superconductor/Normal Metal junctions
- Quantitative measurements of the thermopower of Andreev interferometers
Cited by in corpus (11)
- Superconducting phenomena in systems with unconventional magnets
- Andreev reflection and cyclotron motion at superconductor -- normal-metal interfaces
- Geometrical enhancement of the proximity effect in quantum wires with extended superconducting tunnel contacts
- Andreev reflection and strongly enhanced magnetoresistance oscillations in GaInAs/InP heterostructures with superconducting contacts
- Josephson supercurrent in Nb/InN-nanowire/Nb junctions
- Conductance spectra of (Nb, Pb, In)/NbP -- superconductor/Weyl semimetal junctions
- Andreev reflection for MnTe altermagnet candidate
- Superconductor-semiconductor magnetic microswitch
- Divergent beams of nonlocally entangled electrons emitted from hybrid normal-superconducting structures
- Andreev reflection at the edge of a two-dimensional electron system with strong spin-orbit coupling
- Disordered Quantum Transport in Quantum Anomalous Hall Insulator-Superconductor Junctions