Evolution of a single spin in ideal Bose gas at finite temperatures

O. Hryhorchak; G. Panochko; V. Pastukhov

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arXiv · 2504.09619

Evolution of a single spin in ideal Bose gas at finite temperatures

O. Hryhorchak·G. Panochko·V. Pastukhov

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Abstract

We study the finite-temperature dynamics of non-interacting bosons with a single static spinful impurity immersed. A non-zero contact boson-impurity pairwise interaction is assumed only for the spin-up impurity state. By tracing out bosonic degrees of freedom, the exact time evolution of the impurity spin is calculated for pure and mixed initial ensembles of states. The time-dependent momentum distribution of bosons initially created in the Bose-condensed state and driven by the interaction with spin is analyzed.

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O. Hryhorchak, G. Panochko, V. Pastukhov. 2025-04-13. Evolution of a single spin in ideal Bose gas at finite temperatures. https://arxiv.org/abs/2504.09619

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