Andreev Reflection in Scanning Tunneling Spectroscopy of Unconventional Superconductors

P. O. Sukhachov; Felix von Oppen; L. I. Glazman

doi:10.1103/PhysRevLett.130.216002

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Andreev Reflection in Scanning Tunneling Spectroscopy of Unconventional Superconductors

P. O. Sukhachov, Felix von Oppen, L. I. Glazman

DOI 10.1103/PhysRevLett.130.216002 · Physical Review Letters

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Abstract

We evaluate the differential conductance measured in an STM setting at arbitrary electron transmission between STM tip and a 2D superconductor with arbitrary gap structure. Our analytical scattering theory accounts for Andreev reflections, which become prominent at larger transmissions. We show that this provides complementary information about the superconducting gap structure beyond the tunneling density of states, strongly facilitating the ability to extract the gap symmetry and its relation to the underlying crystalline lattice. We use the developed theory to discuss recent experimental results on superconductivity in twisted bilayer graphene.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaCuO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
BiSrCaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown