Velocity-dependent quantum phase slips in 1D atomic superfluids

Year: 2016

Authors: Tanzi L., Scaffidi Abbate S., Cataldini F., Gori L., Lucioni E., Inguscio M., Modugno G., D’Errico C.

Autors Affiliation: Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; CNR, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy.

Abstract: Quantum phase slips are the primary excitations in one-dimensional superfluids and superconductors at low temperatures but their existence in ultracold quantum gases has not been demonstrated yet. We now study experimentally the nucleation rate of phase slips in one-dimensional superfluids realized with ultracold quantum gases, flowing along a periodic potential. We observe a crossover between a regime of temperature-dependent dissipation at small velocity and interaction and a second regime of velocity-dependent dissipation at larger velocity and interaction. This behavior is consistent with the predicted crossover from thermally-assisted quantum phase slips to purely quantum phase slips.

Journal/Review: SCIENTIFIC REPORTS

Volume: 6      Pages from: 25965-1  to: 25965-7

More Information: We acknowledge discussions with N. Fabbri, C. Fort and I. Danshita. This work was supported by the ERC (Grant No. 247371 – DISQUA), by the EU – H2020 research and innovation programme (Grant No. 641122 – QUIC) and by the Italian MIUR (Grant No. RBFR12NLNA – ArtiQuS).
KeyWords: Behavior; Gases; Human; Velocity; Nanowires; Superconductivity; Transition; Coherence
DOI: 10.1038/srep25965

Citations: 16
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