Quantum thermodynamics of interacting systems

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The work on the self-pinning transition for a two component quasi-one-dimensional quantum gas was extended to the case of finite intra-species repulsion for the component immersed into the Bose-Einstein condensate (BEC), going beyond the previously studied Tonks-Girardeau limit of infinite intra-species interaction. If the finite repulsion is weak compared to the inter-species interaction with the BEC, the immersed component can persist in a coherent superfluid state. Extensive simulations of the numerically amenable case of two and three immersed atoms were used to calculate the phase diagram of the system. The superfluid and self-pinned phases are connected via a first-order phase transition that is also captured by the effective analytical model developed previously. The model predicts the transition to coincide with the two-component miscibility criterion in the limit of large particle numbers in the immersed component.The results are described in a preprint on arXiv in collaboration with Dr. Thomas Fogarty and Prof. Thomas Busch that has been accepted for publication in SciPost Physics.During FY 2022 I also presented posters at the domestic conference "Ultracold Atoms Japan" in Okinawa in April 2022 as well as at the international conference "FINESS" in St. Martin, Germany, in May 2022.