Details
| Original language | English |
|---|---|
| Article number | 156803 |
| Journal | Physical review letters |
| Volume | 124 |
| Issue number | 15 |
| Publication status | Published - 17 Apr 2020 |
| Externally published | Yes |
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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Physical review letters, Vol. 124, No. 15, 156803, 17.04.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dynamical Coulomb Blockade as a Local Probe for Quantum Transport
AU - Senkpiel, Jacob
AU - Klöckner, Jan C.
AU - Etzkorn, Markus
AU - Dambach, Simon
AU - Kubala, Björn
AU - Belzig, Wolfgang
AU - Yeyati, Alfredo Levy
AU - Cuevas, Juan Carlos
AU - Pauly, Fabian
AU - Ankerhold, Joachim
AU - Ast, Christian R.
AU - Kern, Klaus
N1 - Funding information: We gratefully acknowledge stimulating discussions with Elke Scheer and Alexander Weismann. This work was funded in part by the ERC Consolidator Grant AbsoluteSpin (Grant No. 681164). J. C. K., W. B., and F. P. thank the Collaborative Research Center (SFB) 767 of the Deutsche Forschungsgemeinschaft (DFG) for financial support. Part of the numerical modeling was performed using the computational resources of the bwHPC program, namely, the bwUniCluster and the JUSTUS HPC facility. A. L. Y. and J. C. C. acknowledge funding from the Spanish MINECO (Grants No. FIS2017-84057-P and No. FIS2017-84860-R) and from the “María de Maeztu” Programme for Units of Excellence in R&D (MDM-2014-0377). J. A., S. D., and B. K. acknowledge financial support from the Zeiss-Foundation, the Institute for Quantum Science and Technology (IQST), and the Deutsche Forschungsgemeinschaft (DFG) under AN336/11-1.
PY - 2020/4/17
Y1 - 2020/4/17
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85084813300&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.124.156803
DO - 10.1103/PhysRevLett.124.156803
M3 - Article
C2 - 32357030
AN - SCOPUS:85084813300
VL - 124
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 15
M1 - 156803
ER -