Quantum Decoherence and Thermalization at Finite Temperatures of Non-Degenerate Spin Systems via Small Spin Environments

29th Workshop on Recent Developments in Computer Simulation Studies in Condensed Matter Physics

物理学;计算机科学

Novotny, M.A.^1 ; Jin, F.^2 ; De Raedt, H.^3 ; Michielsen, K.^4

Dept. of Physics and Astronomy, HPC2 Center for Computational Sciences, Mississippi State U., Mississippi State

MS

39762, United States^1

Institute for Advanced Simulation, Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich

D-52425, Germany^2

Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, AG Groningen

NL-9747, Netherlands^3

RWTH Aachen University, Aachen

D-52056, Germany^4

关键词: Computational results;    Exact diagonalization;    Finite temperatures;    Perturbation theory;    Quantum decoherence;    Quantum spin systems;    Spin systems;    Thermalization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/750/1/012021/pdf
DOI  :  10.1088/1742-6596/750/1/012021

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We study the case of a small quantum spin system S with a non-degenerate groundstate coupled to a small quantum spin bath. Finite temperature measures for both quantum decoherence and thermalization are studied. The computational results, obtained from exact diagonalization, compare well with a recent perturbation theory prediction, even when the system and bath are of comparable sizes.