Interaction-induced dissipative quantum phase transition in a head-to-tail atomic Josephson junction

Year: 2024

Authors: Furutani K., Salasnich L.

Autors Affiliation: Nagoya Univ, Dept Appl Phys, Nagoya 4648603, Japan; Nagoya Univ, Inst Adv Res, Nagoya 4648601, Japan; Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Via Marzolo 8, I-35131 Padua, Italy; Univ Padua, QTech Ctr, via Marzolo 8, I-35131 Padua, Italy; Ist Nazl Fis Nucleare, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy; CNR, Ist Nazl Ott, Via Carrara 2, I-50019 Sesto Fiorentino, Italy.

Abstract: We propose a dissipative phase transition in a head-to-tail Bose Josephson junction. The quantum phase transition has the same origin as the one in a resistively shunted Josephson junction, but the intrinsic momentum coupling between the Josephson mode and the bath modes enables us to observe the dissipative phase transition without any synthetic dissipation. We show that the interatomic interaction strength plays the role of the damping parameter. Consequently, in contrast to a resistively shunted Josephson circuit, the Bose Josephson junction can exhibit an insulating phase in a wider parameter region by increasing the repulsive interaction strength, which is robust against nonperturbative effects. We argue that tight transverse confinement of the quasi-one-dimensional atomic gas allows us to reach the insulating phase.

Journal/Review: PHYSICAL REVIEW B

Volume: 110 (14)      Pages from: L140503-1  to: L140503-6

More Information: The authors thank Y. Kawaguchi for the useful comments. K.F. was supported by JSPS KAKENHI (Grant No. JP24K22858 and No. JP24K00557) and Maki Makoto Foundation. L.S. is partially supported by the BIRD Project Ultracold atoms in curved geometries of the University of Padova; by the European Union-NextGenerationEU within the National Center for HPC, 13 Big Data and Quantum Computing [Project No. CN00000013, CN1 Spoke 10 Quantum Computing]; by the European Quantum Flagship Project PASQuanS 2; by Iniziativa Specifica Quantum of Istituto Nazionale di Fisica Nucleare; by the Project Frontiere Quantistiche withi n the 2023 funding program Dipartimenti di Eccellenza of the Italian Ministry for Universities and Research; by the PRIN 2022 Project Quantum Atomic Mixtures Droplets, Topological Structures, and Vortices.
KeyWords: Localization; Particle; Noise
DOI: 10.1103/PhysRevB.110.L140503