Title:
Andreev Reflection in Scanning Tunneling Spectroscopy of Unconventional Superconductors
Author(s):
Sukhachov, P. O.; Oppen, Felix von; Glazman, L. I.
Year of publication:
2023
Available Date:
2024-03-15T09:11:47Z
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.
Part of Identifier:
ISSN (print): 0031-9007
e-ISSN (online): 1079-7114
Keywords:
Andreev reflection
Scattering amplitudes
Superconducting gap
Superconducting order parameter
Transport phenomena
Superconducting devices
Tunnel junctions
Unconventional superconductors
Methods in superconductivity
Scanning tunneling spectroscopy
DDC-Classification:
539 Moderne Physik
Publication Type:
Wissenschaftlicher Artikel
URL of the Original Publication:
DOI of the Original Publication:
Journal Volume:
130 (2023)
Journaltitle:
Physical Review Letters
Publisher:
American Physical Society
Publisher Place:
College Park, MD
Department/institution:
Physik
Institut für Theoretische Physik