Andreev magnetotransport in low-dimensional proximity structures: Spin-dependent conductance enhancement

Abstract

We study the excess conductance due to the superconducting proximity effect in a ballistic two-dimensional electron system subject to an in-plane magnetic field. We show that under certain conditions the interplay of the Zeeman spin splitting and the effect of a screening supercurrent gives rise to a spin-selective Andreev enhancement of the conductance and anomalies in its voltage, temperature and magnetic field characteristics. The magnetic-field influence on Andreev reflection is discussed in the context of using superconducting hybrid junctions for spin detection.

4 pages, 5 figures

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• Two-dimensional topological insulators in quantizing magnetic fields
• Evidence for a New Excitation at the Interface Between a High-Tc Superconductor and a Topological Insulator
• Enhanced superconducting proximity effect in clean ferromagnetic domain structures
• Chiral current-phase relation of topological Josephson junctions: A signature of the $4\pi$-periodic Josephson effect
• Superconducting quantum spin-Hall systems with giant orbital g-factors
• Magnetic field suppression of Andreev conductance at superconductor-graphene interfaces
• Andreev Reflection without Fermi surface alignment in High T${}_c$-Topological heterostructures
• Geometric phases and Andreev reflection in hybrid rings