Full Counting Statistics of Yu-Shiba-Rusinov Bound States

dc.contributor.authorOhnmacht, David
dc.contributor.authorBelzig, Wolfgang
dc.contributor.authorCuevas, Juan Carlos
dc.date.accessioned2023-05-24T08:05:07Z
dc.date.available2023-05-24T08:05:07Z
dc.date.issued2023
dc.description.abstractWith the help of scanning tunneling microscopy (STM) it has become possible to address single magnetic impurities on superconducting surfaces and to investigate the peculiar properties of the in-gap states known as Yu-Shiba-Rusinov (YSR) states. However, until very recently YSR states were only investigated with conventional tunneling spectroscopy, missing the crucial information contained in other transport properties such as shot noise. Here, we adapt the concept of full counting statistics (FCS) to provide a very deep insight into the spin-dependent transport in these hybrid systems. We illustrate the power of FCS by analyzing different situations in which YSR states show up including single-impurity junctions, as well as double-impurity systems where one can probe the tunneling between individual YSR states. The FCS concept allows us to unambiguously identify every tunneling process that plays a role in these situations. Moreover, FCS provides all the relevant transport properties, including current, shot noise and all the cumulants of the current distribution. Our approach can reproduce the experimental results recently reported on the shot noise of a single-impurity junction with a normal STM tip. We also predict the signatures of resonant (and non-resonant) multiple Andreev reflections in the shot noise of single-impurity junctions with two superconducting electrodes. In the case of double-impurity junctions we show that the direct tunneling between YSR states is characterized by a strong reduction of the Fano factor that reaches a minimum value of 7/32, a new fundamental result in quantum transport. The FCS approach presented here can be naturally extended to investigate the spin-dependent superconducting transport in a variety of situations, and it is also suitable to analyze multi-terminal superconducting junctions, irradiated contacts, and many other basic situations.
dc.description.versionsubmitted
dc.identifier.arxiv2305.04758
dc.identifier.urihttps://kops.uni-konstanz.de/handle/123456789/66952
dc.language.isoeng
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.subjectscanning tunneling microscopy
dc.subject.ddc530
dc.titleFull Counting Statistics of Yu-Shiba-Rusinov Bound Stateseng
dc.typePREPRINT
dspace.entity.typePublication
relation.isAuthorOfPublication411b8c9d-3140-404e-bab1-9d5550604ed4
relation.isAuthorOfPublication5008f36c-f1e5-403a-b331-40c1df19add6
relation.isAuthorOfPublicationfe08c0b3-8de4-4d49-9750-c6ea6c294b02
temp.submission.doi
temp.submission.source
Dateien
Sammlungen

Versionsgeschichte

Gerade angezeigt 1 - 2 von 2
VersionDatumZusammenfassung
2023-09-12 10:56:37
Veröffentlichung
1*
2023-05-24 08:05:07
* Ausgewählte Version