Dynamical Coulomb Blockade as a Local Probe for Quantum Transport

verfasst von
Jacob Senkpiel, Jan C. Klöckner, Markus Etzkorn, Simon Dambach, Björn Kubala, Wolfgang Belzig, Alfredo Levy Yeyati, Juan Carlos Cuevas, Fabian Pauly, Joachim Ankerhold, Christian R. Ast, Klaus Kern
Abstract

Quantum fluctuations are imprinted with valuable information about transport processes. Experimental access to this information is possible, but challenging. We introduce the dynamical Coulomb blockade (DCB) as a local probe for fluctuations in a scanning tunneling microscope (STM) and show that it provides information about the conduction channels. In agreement with theoretical predictions, we find that the DCB disappears in a single-channel junction with increasing transmission following the Fano factor, analogous to what happens with shot noise. Furthermore we demonstrate local differences in the DCB expected from changes in the conduction channel configuration. Our experimental results are complemented by ab initio transport calculations that elucidate the microscopic nature of the conduction channels in our atomic-scale contacts. We conclude that probing the DCB by STM provides a technique complementary to shot noise measurements for locally resolving quantum transport characteristics.

Externe Organisation(en)
Max-Planck-Institut für Festkörperforschung
Okinawa Institute of Science and Technology Graduate University (OIST)
Universität Konstanz
Universität Ulm
Universidad Autónoma de Madrid (UAM)
Eidgenössische Technische Hochschule Lausanne (ETHL)
Typ
Artikel
Journal
Physical review letters
Band
124
ISSN
0031-9007
Publikationsdatum
17.04.2020
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Physik und Astronomie (insg.)
Elektronische Version(en)
https://doi.org/10.1103/PhysRevLett.124.156803 (Zugang: Offen)