2020/03/31 by Andrea Tononi, Flavio Toigo, Sandro Wimberger +2
Physics and Astronomy · #Amplitude #Coherence (philosophical gambling strategy) #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Coupling (piping) #Dephasing #Excitation #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Quantum tunnelling #Quantum, superfluid, helium dynamics #Quasiparticle #cond-mat.quant-gas
paper · pdf · doi:10.1088/1367-2630/ab965d
published as New J. Phys. 22, 073020 (2020) · 15 pages, 4 figures
openalex created_date 2020/04/03 · openalex publication_date 2020/05/26 · arxiv created 2020/07/20 · arxiv updated 2020/07/21 · openalex updated_date 2026/08/06
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 below T ≲ 5 nK.