Quantum thermodynamics of interacting systems

对双组分准一维量子气体的自固定跃迁的研究扩展到浸入玻色-爱因斯坦凝聚（BEC）的组分的有限种内排斥的情况，超越了先前研究的无限种内相互作用的Tonks-Girardeau极限。如果有限斥力比与BEC的种间相互作用弱，则浸入分量可以保持相干超流体状态。对两个和三个浸没原子的情况进行了广泛的数值模拟，计算了系统的相图。超流体和自固定相通过一阶相变连接在一起，该相变也被先前开发的有效分析模型所捕获。该模型预测，在浸没构件的大颗粒数极限下，过渡符合双组分混相准则。研究结果发表在arXiv上的预印本中，该预印本由Thomas Fogarty博士和Thomas Busch教授合作完成，并已被SciPost Physics接受发表。在2022财年期间，我还在2022年4月在冲绳举行的国内会议“日本超冷原子”和2022年5月在德国圣马丁举行的国际会议“FINESS”上展示了海报。

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.