Equilibrium and dynamical quantum phase transitions in dipolar atomic Josephson junctions

• URL: http://arxiv.org/abs/2602.20322v1
• Date: Mon, 23 Feb 2026 20:15:19 GMT
• Title: Equilibrium and dynamical quantum phase transitions in dipolar atomic Josephson junctions
• Authors: Cesare Vianello, Giovanni Mazzarella, Luca Salasnich,
• Abstract summary: An atomic Josephson junction realized with dipolar bosons in a double-well potential can be described by an extended Bose-Hubbard model.<n>We investigate how this correlated process affects zero-temperature equilibrium and dynamical properties of the system.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: An atomic Josephson junction realized with dipolar bosons in a double-well potential can be described by an extended Bose-Hubbard model in which dipolar interactions generate an effective on-site interaction and nearest-neighbor pair tunneling. Using mean-field theory and exact diagonalization, we investigate how this correlated process affects zero-temperature equilibrium and dynamical properties of the system. In equilibrium, we show that pair tunneling induces ground-state parity modulations and significantly reshapes the phase diagram, producing qualitative changes in the quantum phase transitions toward NOON and phase-NOON states, as well as quantitative shifts of the critical points. Out of equilibrium, we demonstrate that it modifies the conditions for macroscopic quantum self-trapping, and assess its impact by comparing mean-field and fully quantum evolution, including the emergence of dynamical quantum phase transitions.

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