TY - JOUR
T1 - Subgap structure in asymmetric superconducting tunnel junctions
AU - Ternes, Markus
AU - Schneider, Wolf Dieter
AU - Cuevas, Juan Carlos
AU - Lutz, Christopher P.
AU - Hirjibehedin, Cyrus F.
AU - Heinrich, Andreas J.
PY - 2006
Y1 - 2006
N2 - Conductance measurements between two superconducting electrodes with different gap energies Δ1 and Δ2 were performed with a low-temperature scanning tunneling microscope. The temperature dependence and tip-sample distance dependence of the spectra show a pronounced subgap structure which is interpreted as multiple Andreev reflections (MARs). Low temperature conductance peaks not seen in symmetric superconducting tunnel junctions arise at energies ± Δ1 - Δ2 when the superconducting gaps are sufficiently different. We propose an explanation of these findings by extending the full counting statistics of MARs to describe these asymmetric junctions.
AB - Conductance measurements between two superconducting electrodes with different gap energies Δ1 and Δ2 were performed with a low-temperature scanning tunneling microscope. The temperature dependence and tip-sample distance dependence of the spectra show a pronounced subgap structure which is interpreted as multiple Andreev reflections (MARs). Low temperature conductance peaks not seen in symmetric superconducting tunnel junctions arise at energies ± Δ1 - Δ2 when the superconducting gaps are sufficiently different. We propose an explanation of these findings by extending the full counting statistics of MARs to describe these asymmetric junctions.
UR - http://www.scopus.com/inward/record.url?scp=33749322945&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.74.132501
DO - 10.1103/PhysRevB.74.132501
M3 - Article
AN - SCOPUS:33749322945
SN - 1098-0121
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 13
M1 - 132501
ER -