Seminaria

Dnia 2025-12-16 o godzinie 13:15 w Sali 2011 Wydziału Fizyki UwB, mgr Maciej Lewkowicz ze Szkoły Doktorskiej UwB wygłosi wykład pt:

„Supersolidity of dipolar Bose-Einstein condensates induced by coupling to fermions and dynamic formation of this phase”

Serdecznie zapraszamy

Andrzej Maziewski

Jerzy Przeszowski

„Supersolidity of dipolar Bose-Einstein condensates induced by coupling to fermions and dynamic formation of this phase”

mgr Maciej Lewkowicz

We study a mixture of a repulsive dipolar condensate and a degenerate Fermi gas in a quasi-one-dimensional geometry. We demonstrate that the presence of fermions, which attract bosons, drastically changes the behavior of the dipolar condensate. For a strong enough boson-fermion attraction, a dipolar Bose-Fermi droplet appears in the mixture, and as the attraction becomes stronger, a roton excitation develops in the Bogoliubov spectrum, leading to the formation of a supersolid, and eventually a crystal of isolated droplets. We describe the system by coupled extended Gross-Pitaevskii (bosons) and Hartree-Fock (fermions) equations. We study the excitation spectrum of the system and identify a number of Goldstone and Higgs modes in the supersolid regime. In the second part, we focus on the dynamical change of interaction parameters — a procedure known as a quench. Using this quench protocol, we excite the supersolid phase.