Behavior of the impurity atom in a weakly-interacting Bose gas

Behavior of the impurity atom in a weakly-interacting Bose gas

Panochko, G. ; Pastukhov, V. ; Vakarchuk, I.

Інші назви: Поведiнка домiшкового атома в слабковзаємодiючому бозе-газi

Інший ID: PACS: 67.60.Bc, 03.75.Hh
DOI:10.5488/CMP.20.13604
arXiv:1703.10390

URI: http://dspace.nbuv.gov.ua/handle/123456789/156974

Посилання: Behavior of the impurity atom in a weakly-interacting Bose gas / G. Panochko, V. Pastukhov, I. Vakarchuk // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13604: 1–11 . — Бібліогр.: 19 назв. — англ.

Підтримка: This work was partly supported by Project FF-30F (No. 0116U001539) from the Ministry of Education and Science of Ukraine. The authors appreciate the help of Dr. Mykola Stetsko in the preparation of this article. One of the authors (I. Vakarchuk) expresses satisfaction with the fact that he was invited to participate in the publication of articles in honor of Yu. Holovatch. He has been one of my first students (since his schooldays), who defended his thesis on phase transitions, and is engaged now in the research of complex systems of non-physical nature using methods of statistical physics. I wish him new successes in this extremely interesting area of human activity

Дата: 2017

Завантажень: 276

Behavior of the impurity atom in a weakly-interacting Bose gas

Анотація:

We studied the properties of a single impurity atom immersed in a dilute Bose condensate at low temperatures. In particular, we perturbatively obtained the momentum dependence of the impurity spectrum and damping. By means of the Brillouin-Wigner perturbation theory we also calculated the self-energy both for attractive and repulsive polaron in the long-wavelength limit. The stability problem of the impurity atom in a weakly-interacting Bose gas is also examined.

В роботi вивчено поведiнку домiшкового атома у розрiдженому бозе-конденсатi в границi низьких температур. Отримано пертурбативним методом спектр домiшки та його загасання в залежностi вiд iмпульсу. В рамках теорiї збурень Брiлюена–Вiгнера знайдено власну енергiю притягального та вiдштовхувального полярона в довгохвильовiй границi. Також вивчено питання стабiльностi полярона в слабковзаємодiючому бозе-газi.

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