סמינר מחלקה אלקטרוניקה פיזיקאלית: Artem Volosniev

You are invited to attend a department seminar

Impurity atoms in one-dimensional Bose gases
By:
Artem Volosniev
TU Darmstadt (Germany)

Abstract

 The subject of this study are impurity atoms immersed in an environment. The purpose is to understand/calculate properties of these atoms. Particularly interesting are their self-energies and masses, the latter are usually larger than masses of bare atoms due to the “dress” of low-energy excitations of the environment. Another question of the study is the impurity-impurity interaction. Impurities in the environment often attract one another stronger than in free space, which may drastically change properties of the system.
 In the talk, I will present a polaron-like effective description of an atom in a Bose gas,  and address the possibility of testing this description in experiments with cold atoms. Furthermore, I will discuss properties of two impurity atoms. The impurities attract each other, because their energy is lowered when they share the same distortion of the Bose gas. Therefore, even if atoms do not interact in free space they form a bound state when immersed in a Bose gas [any attractive interaction in one spatial dimension leads to a bound state, which, however, can be very shallow]. This can potentially be used in the future as an experimental signature of the induced attraction mediated by the Bose gas.

On Thursday, May 23, 2019, 15:00

Room 011, EE-Class Building