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Q: Fachverband Quantenoptik und Photonik
Q 13: Ultracold Matter (Bosons) I (joint session Q/A)
Q 13.7: Vortrag
Montag, 10. März 2025, 18:30–18:45, HS I PI
Localization/delocalization-phase transition of quantum impurities in 1D Bose gases — •Dennis Breu, Eric Vidal Marcos, Martin Will, and Michael Fleischhauer — University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
We investigate the dynamics of a single finite-mass impurity in a 1D Bose gas in a box potential using Tensor Network simulations. This algorithm makes it possible to theoretically probe Bose polarons in the regime of strong bose-bose interactions for the entire range of the Tonks parameter γ. We observe a transition between a delocalized impurity and an impurity localized at the system boundaries, as a function of Impurity-Bose interaction strength. While this transition can reasonably be predicted by a mean-field ansatz based on coupled Gross-Pitaevski-Schrödinger equations, the mean-field ansatz also suggests the existence of a self-localized polaron solution. We show that the self-localization is an artifact of the underlying decoupling approximation. This shows that even for weak bose-bose interactions, where mean-field approaches are expected to work well, Impurity-Bose correlations are important for representing the true behavior of a system. By comparing energy estimations of the phases, we also calculate the critical Bose-Bose interactions strength of the phase transition.
Keywords: self-localization; polarons; theoretical; simulations; localization/delocalization phase transistion