Double-weak-link interferometer of hard-core bosons in one dimension

Abstract:We study the dynamics of a lattice hard-core boson gas released from a domain wall initial state in the presence of two weak links (defects). When the two defects are separated by a finite distance, the resulting density profile exhibits interferences, while when we take the large-distance limit between the two defects, those interferences are averaged out and one recovers a profile that is described by the standard Euler-scale hydrodynamic description of the gas. We analyze this in detail by computing the exact fermionic propagators and their repeated reflections at the defects. We derive a closed analytic expression for the density profile during the expansion, explicitly highlighting the role played by these interference processes.

Quantum Gases (cond-mat.quant-gas); Statistical Mechanics (cond-mat.stat-mech); Quantum Physics (quant-ph)

arXiv:2603.29583 [cond-mat.quant-gas]

(or arXiv:2603.29583v2 [cond-mat.quant-gas] for this version)

https://doi.org/10.48550/arXiv.2603.29583 Focus to learn more arXiv-issued DOI via DataCite

Attila Takács et al J. Stat. Mech. (2026) 103102

https://doi.org/10.1088/1742-5468/aeab76 Focus to learn more DOI(s) linking to related resources

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