Extracting transport channel transmissions in scanning tunneling microscopy using superconducting excess current

Jacob Senkpiel; Robert Drost; Jan C. Klöckner; Markus Etzkorn; Joachim Ankerhold; Juan Carlos Cuevas; Fabian Pauly; Klaus Kern; Christian R. Ast

doi:10.1103/PhysRevB.105.165401

Extracting transport channel transmissions in scanning tunneling microscopy using superconducting excess current

Jacob Senkpiel, Robert Drost, Jan C. Klöckner, Markus Etzkorn, Joachim Ankerhold, Juan Carlos Cuevas, Fabian Pauly, Klaus Kern, Christian R. Ast

DOI 10.1103/PhysRevB.105.165401 · Physical Review B

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Abstract

Transport through quantum coherent conductors, such as atomic junctions, is described by conduction channels. Information about the number of channels and their transmissions can be extracted from various sources, such as multiple Andreev reflections, dynamical Coulomb blockade, or shot noise. We complement this set of methods by introducing the superconducting excess current as a new tool to continuously extract the transport channel transmissions of an atomic scale junction in a scanning tunneling microscope. In conjunction with ab initio simulations, we employ this technique in atomic aluminum junctions to determine the influence of the structure adjacent to the contact atoms on the transport properties.

Source-reported materials — not catalogue approval

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