др Томасо Макри

19. новембра 2021.

:sr]У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 25. новембра 2021. године у 14 часова путем Zoom платформе, др Томасо Макри (Департман за теоријску и експерименталну физику, Федерални универзитет у Рио Гранде до Норте, Натал, Бразил), одржаће предавање:

Solitons and polarons in ultracold bosonic mixtures


The realization of multicomponent systems offers a natural playground to observe nonequilibrium effects in a more general framework. Restricting to two-component BECs, one notices already a rich variety of phases in the ground state. In purely repulsive mixtures, one observes a homogeneous superfluid or a phase separation when inter-species repulsion overcomes the intra-species interaction strength. In the attractive regime a series of recent experiments showed the formation of dilute self-bound droplet states in a two-component BEC both in a tight optical waveguide and in free space, closely following the theoretical predictions. In the quasi one-dimensional geometry, upon varying the mean-field interaction from the weakly to the strongly attractive regime, one observes a smooth crossover between bright soliton states and self-bound droplets. In the first part of this talk we will investigate the quench dynamics of a two component Bose mixture and study the onset of modulational instability, which leads the system far from equilibrium. Analogous to the single-component counterpart, this phenomenon results in the creation of trains of bright solitons. In the second part we will discuss the properties of impurities in uniform and self-bound states of heteronuclear mixtures inspired by recent experiments. Finally, we will focus on the formation of exotic bound states for an impurity interacting with a self-bound droplet.

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Meeting ID: 813 8100 5164
Passcode: 667308