Anomalous Conductances in an Ultracold Quantum Wire.
- Kanász-Nagy M Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
- Glazman L Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
- Esslinger T Department of Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Demler EA Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
- 2016-12-31
Published in:
- Physical review letters. - 2016
English
We analyze the recently measured anomalous transport properties of an ultracold gas through a ballistic constriction [S. Krinner et al., Proc. Natl. Acad. Sci. U.S.A. 113, 8144 (2016)]. The quantized conductance observed at weak interactions increases severalfold as the gas is made strongly interacting, which cannot be explained by the Landauer theory of single-channel transport. We show that this phenomenon is due to the multichannel Andreev reflections at the edges of the constriction, where the interaction and confinement result in a superconducting state. Andreev processes convert atoms of otherwise reflecting channels into the condensate propagating through the constriction, leading to a significant excess conductance. Furthermore, we find the spin conductance being suppressed by superconductivity; the agreement with experiment provides an additional support for our model.
- Language
-
- English
- Open access status
- hybrid
- Identifiers
-
- DOI 10.1103/PhysRevLett.117.255302
- PMID 28036203
- Persistent URL
- https://sonar.ch/global/documents/153681
Statistics
Document views: 33
File downloads:
- Full-text: 0