Dephasing-rephasing dynamics of one-dimensional tunneling quasicondensates

Year: 2020

Authors: Salasnich L., Tononi A., Toigo F., S. Wimberger, A. Cappellaro

Autors Affiliation: Dipartimento di Fisica e Astronomia ‘Galileo Galilei’, Università di Padova, via Marzolo 8, 35131 Padova, Italy; Dipartimento di ScienzeMatematiche, Fisiche ed Informatiche, Università di Parma, Parco Area delle Scienze 7/A, 43124 Parma, Italy; INFN, Sezione di Milano Bicocca, Gruppo Collegato di Parma, Parma, Italy

Abstract: We study the quantum tunneling of two one-dimensional quasi-condensates made of alkali-metal atoms, considering two different tunneling configurations: side-by-side and head-to-tail. After deriving the quasiparticle excitation spectrum, we discuss the dynamics of the relative phase following a sudden coupling of the independent subsystems. In particular, we calculate the coherence factor of the system, which, due to the nonzero tunneling amplitude, it exhibits dephasing-rephasing oscillations instead of pure dephasing. These oscillations are enhanced by a higher tunneling energy, and by higher system densities. Our predictions provide a benchmark for future experiments at temperatures belowT less than or similar to 5 nK.


Volume: 22      Pages from: 073020-1  to: 073020-10

KeyWords: Bose-Einstein condensation; Josephson tunneling; phase coherence; decoherence.
DOI: 10.1088/1367-2630/ab965d