Quantized conductance through the quantum evaporation of bosonic atoms

Year: 2016

Authors: Papoular DJ., Pitaevskii LP., Stringari S.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; CNRS, UMR 8089, LPTM, F-95302 Cergy Pontoise, France; Univ Cergy Pontoise, F-95302 Cergy Pontoise, France; Kapitza Inst Phys Problems, Kosygina 2, Moscow 119334, Russia.

Abstract: We analyze theoretically the quantization of conductance occurring with cold bosonic atoms trapped in two reservoirs connected by a constriction with an attractive gate potential. We focus on temperatures slightly above the condensation threshold in the reservoirs. We show that a conductance step occurs, coinciding with the appearance of a condensate in the constriction. Conductance relies on a collective process involving the quantum condensation of an atom into an elementary excitation and the subsequent quantum evaporation of an atom, in contrast with ballistic fermion transport. The value of the bosonic conductance plateau is strongly enhanced compared to fermions and explicitly depends on temperature. We highlight the role of the repulsive interactions between the bosons in preventing them from collapsing into the constriction. We also point out the differences between the bosonic and fermionic thermoelectric effects in the quantized conductance regime.

Journal/Review: PHYSICAL REVIEW A

Volume: 94 (2)      Pages from: 23622-1  to: 23622-6

More Information: We thank J.-P. Brantut and T. Esslinger for stimulating discussions. This work has been supported by the European Research Council (ERC) through the QGBE grant, by the QUIC grant of the Horizon 2020 FET program, and by Provincia Autonoma di Trento.
KeyWords: Point Contacts; Resistance; Transport; Flow
DOI: 10.1103/PhysRevA.94.023622

Citations: 11
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