【Date and Time】2-July-2024 3pm (Beijing time)

【Venue】Room 526

【Host】Li You ( Tsinghua Univ. & BAQIS)

【Title】Thermodynamics and ordered phases of dipolar Bosons

【Speaker】 

Thomas Pohl is a Professor of Theoretical Physics at the Vienna University of Technology, where he leads the research group “Light-Matter Interactions”. He completed his PhD at the Max-Planck Institute for the Physics of Complex Systems (MPIPKS) in Dresden, Germany, and thereafter received an ITAMP Postdoctoral Fellowship at the Harvard-Smithsonian Center for Astrophysics (CfA). Following his postdoctoral work at the CfA and Harvard University, he became a Research Group Leader at the MPIPKS and in 2017 was awarded a Niels Bohr Professorship from the Danish National Research Foundation (DNRF) to establish his research group at Aarhus University in Denmark, where he has been leading the DNRF-Center of Excellence for Complex Quantum Systems before moving to Vienna in 2023. His research interests lie at the interface of atomic physics, quantum optics and manybody theory, where his group investigates collective behavior in ensembles of interacting particles and photons and explores potential applications of such complex quantum phenomena.

【Abstract】

Bosonic quantum many-particle systems with long-range dipolar interactions display remarkable behaviour, such as the formation of quantum droplets and the emergence of supersolid phases with a rich spectrum of complex density-wave patterns. In particular, the anisotropic nature of dipole-dipole interactions highlights the role of fluctuations and, thereby, provides unique opportunities to scrutinize theoretical descriptions of quantum effects beyond simple meanfield pictures. Experiments on ultracold atoms with large magnetic dipoles and, more recently, the realization of ultracold polar molecules offer an excellent laboratory platform for exploring such phenomena and improving our understanding of long-range interacting quantum gases.

In this talk, we consider theoretically the formation of ordered phases of dipolar Bosons under conditions of recent experiments with magnetic atoms as well as polar molecules. Special emphasis will be placed on the detailed role of quantum fluctuations, confinement and geometry as well as temperature effects for the formation of ordered phases in extended systems of dipolar Bosons.