др Милан Радоњић

13. фебруара 2021.

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 18. фебруара 2021. године у 14 часова путем Zoom платформе, др Милан Радоњић (Лабораторија за примену рачунара у науци, Институт за физику у Београду, Департман за физику, Технички универзитет Кајзерслаутерн, Немачка) одржаће предавање:

Non-equilibrium evolution of Bose-Einstein condensate deformation in temporally controlled weak disorder


In this talk we will consider a time-dependent extension of a perturbative mean-field approach to the homogeneous dirty boson problem by investigating how switching on and off a weak disorder potential affects the stationary state of an initially equilibrated Bose-Einstein condensate by the emergence of a disorder-induced condensate deformation. In the switch-on scenario, we will study if the stationary condensate deformation turns out to be a sum of an equilibrium part [1], that actually corresponds to adiabatically switching on the disorder, and a dynamically-induced part, where the latter depends on the particular driving protocol [2]. If the disorder is switched off afterwards, we will find out if the resulting condensate deformation acquires an additional dynamically-induced part in the long-time limit, and what happens with the equilibrium part. We will also present an appropriate generalization to inhomogeneous trapped condensates. Our results demonstrate that the condensate deformation represents an indicator of the generically non-equilibrium nature of steady states of a Bose gas in a temporally controlled weak disorder.

[1] K. Huang and H.-F. Meng, Phys. Rev. Lett. 69, 644 (1992)
[2] Milan Radonjić and Axel Pelster, SciPost Phys. 10, 008 (2021)

Приступите предавању

Meeting ID: 839 8287 2129
Passcode: 529607