Details
| Original language | English |
|---|---|
| Article number | 131 |
| Journal | Communications Physics |
| Volume | 3 |
| Issue number | 1 |
| Publication status | Published - 1 Dec 2020 |
| Externally published | Yes |
Abstract
The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to the order parameter starting from transmissions of τ > 0.1. Using the full current-phase relation, we model the Josephson effect in the dynamical Coulomb blockade regime, where the charging energy of the junction capacitance cannot be neglected, and find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge transfer operator shows that at high transmission, non-linear behaviour arises and multiple Cooper pair tunneling may occur. Our model includes these deviations, which become non-negligible in Josephson-STM, for example, when scanning across single adatoms.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Communications Physics, Vol. 3, No. 1, 131, 01.12.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Single channel Josephson effect in a high transmission atomic contact
AU - Senkpiel, Jacob
AU - Dambach, Simon
AU - Etzkorn, Markus
AU - Drost, Robert
AU - Padurariu, Ciprian
AU - Kubala, Björn
AU - Belzig, Wolfgang
AU - Yeyati, Alfredo Levy
AU - Cuevas, Juan Carlos
AU - Ankerhold, Joachim
AU - Ast, Christian R.
AU - Kern, Klaus
N1 - Funding information: We gratefully acknowledge fruitful discussions with Berthold Jäck and Elke Scheer. Funding from the European Research Council for the Consolidator Grant ABSOLUTE-SPIN (Grant No. 681164), from the Spanish MINECO (Grant No. FIS2014-55486-P, FIS2017-84057-P and FIS2017-84860-R), from the “María de Maeztu” Programme for Units of Excellence in R&D (MDM-2014-0377), from the Zeiss Foundation, from the DFG through AN336/11-1 and from the IQST is also gratefully acknowledged. J.C.C. and W.B. acknowledge support from the DFG through SFB 767.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to the order parameter starting from transmissions of τ > 0.1. Using the full current-phase relation, we model the Josephson effect in the dynamical Coulomb blockade regime, where the charging energy of the junction capacitance cannot be neglected, and find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge transfer operator shows that at high transmission, non-linear behaviour arises and multiple Cooper pair tunneling may occur. Our model includes these deviations, which become non-negligible in Josephson-STM, for example, when scanning across single adatoms.
AB - The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to the order parameter starting from transmissions of τ > 0.1. Using the full current-phase relation, we model the Josephson effect in the dynamical Coulomb blockade regime, where the charging energy of the junction capacitance cannot be neglected, and find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge transfer operator shows that at high transmission, non-linear behaviour arises and multiple Cooper pair tunneling may occur. Our model includes these deviations, which become non-negligible in Josephson-STM, for example, when scanning across single adatoms.
UR - http://www.scopus.com/inward/record.url?scp=85088359376&partnerID=8YFLogxK
U2 - 10.1038/s42005-020-00397-z
DO - 10.1038/s42005-020-00397-z
M3 - Article
AN - SCOPUS:85088359376
VL - 3
JO - Communications Physics
JF - Communications Physics
IS - 1
M1 - 131
ER -