http://hdl.handle.net/20.500.12128/19142
Tytuł: | Energy of a free Brownian particle coupled to thermal vacuum |
Autor: | Łuczka, Jerzy Spiechowicz, Jakub |
Słowa kluczowe: | physics; quantum physics; statistical physics |
Data wydania: | 2021 |
Źródło: | "Scientific Reports" (2021), Vol. 11, art. no. 4088 |
Abstrakt: | Experimentalists have come to temperatures very close to absolute zero at which physics that was once ordinary becomes extraordinary. In such a regime quantum effects and fluctuations start to play a dominant role. In this context we study the simplest open quantum system, namely, a free quantum Brownian particle coupled to thermal vacuum, i.e. thermostat in the limiting case of absolute zero temperature. We analyze the average energy E=E(c) of the particle from a weak to strong interaction strength c between the particle and thermal vacuum. The impact of various dissipation mechanisms is considered. In the weak coupling regime the energy tends to zero as E(c)∼cln(1/c) while in the strong coupling regime it diverges to infinity as E(c)∼c√. We demonstrate it for selected examples of the dissipation mechanisms defined by the memory kernel γ(t) of the Generalized Langevin Equation. We reveal how at a fixed value of c the energy E(c) depends on the dissipation model: one has to compare values of the derivative γ′(t) of the dissipation function γ(t) at time t=0 or at the memory time t=τc which characterizes the degree of non-Markovianity of the Brownian particle dynamics. The impact of low temperature is also presented. |
URI: | http://hdl.handle.net/20.500.12128/19142 |
DOI: | 10.1038/s41598-021-83617-y |
ISSN: | 2045-2322 |
Pojawia się w kolekcji: | Artykuły (WNŚiT) |
Plik | Opis | Rozmiar | Format | |
---|---|---|---|---|
Spiechowicz_Luczka_energy_of_a_free_brownian.pdf | 2,36 MB | Adobe PDF | Przejrzyj / Otwórz |
Uznanie Autorstwa 3.0 Polska Creative Commons