Exploring quantum phase slips in 1D bosonic systems

Year: 2017

Authors: Scaffidi Abbate S., Gori L., 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, i.e., the primary excitations in onedimensional superfluids at low temperature, have been well characterized in most condensed-matter systems, with the notable exception of ultracold quantum gases. Here we present our experimental investigation of the dissipation in one-dimensional Bose superfluids flowing along a periodic potential, which show signatures of the presence of quantum phase slips. In particular, by controlling the velocity of the superfluid and the interaction between the bosons we are apparently able to drive a crossover from a regime of thermal phase slips into a regime of quantum phase slips. Achieving a good control of quantum phase slips in ultracold quantum gases requires to keep under control other phenomena such as the breaking of superfluidity at the critical velocity or the appearance of a Mott insulator in the strongly correlated regime. Here we show our current results in these directions.

Journal/Review: EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS

Volume: 226 (12)      Pages from: 2815  to: 2827

More Information: We thank F. Cataldini, M. D. Hoogerland, A. Kumar, E. Lucioni and L. Tanzi for valuable contributions to the experiment and G. Boeris, G. Carleo, T. Giamarchi and L. Sanchez-Palencia for their theoretical modeling. We acknowledge discussions with I. Danshita and M. Kunimi. This work was supported by the ERC (Grant No. 247371 – DISQUA), by the EC – H2020 research and innovation programme (Grant No. 641122 – QUIC) and by the Italian MIUR (Grant No. RBFR12NLNA – ArtiQuS).
KeyWords: quantum phase slips, dissipation, transport, superfluids
DOI: 10.1140/epjst/e2016-60381-0

Citations: 6
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