Universität Potsdam Institut für Physik KarlLiebknechtStr. 24/25 14476 PotsdamGolm 



AbstractThermal equilibrium properties of nanoscale systems deviate from standard macroscopic predictions due to a nonnegligible coupling to the environment. For anisotropic threedimensional materials, we derive the mean force corrections to the equilibrium state of a classical spin vector. The result is valid at arbitrary coupling strength. Specifically, we consider cubic, orthorhombic, and monoclinic symmetries, and compare their spin expectation values as a function of temperature. We underpin the correctness of the mean force state by evidencing its match with the steady state of the simulated nonMarkovian spin dynamics. The results show an explicit dependence on the symmetry of the confining material. In addition, some coupling symmetries show a spin alignment transition at zero temperature. Finally, we quantify the work extraction potential of the mean forcegenerated inhomogeneities in the energy shells. Such inhomogeneities constitute a classical equivalent to quantum coherences. file generated: 5 Jan 2024


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