Anisotropic signatures in the spin–boson model
Hartmann, F; Scali, S; Anders, J
Date: 7 November 2023
Article
Journal
Physical Review B
Publisher
American Physical Society
Publisher DOI
Abstract
Thermal equilibrium properties of nanoscale systems deviate from standard macroscopic predictions due to non–negligible coupling to the environment. For anisotropic three–dimensional
materials, we derive the mean force corrections to the equilibrium state of a classical spin vector.
Specifically, we consider cubic, orthorhombic, and ...
Thermal equilibrium properties of nanoscale systems deviate from standard macroscopic predictions due to non–negligible coupling to the environment. For anisotropic three–dimensional
materials, we derive the mean force corrections to the equilibrium state of a classical spin vector.
Specifically, we consider cubic, orthorhombic, and monoclinic symmetries, and compare their spin
expectation values as a function of temperature. The results are valid at arbitrary coupling strength.
We underpin the correctness of the mean force state by evidencing its match with the steady state
of the simulated non–Markovian 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
force–generated inhomogeneities in the energy shells. Such inhomogeneities constitute a classical
equivalent to quantum coherences.
Physics and Astronomy
Faculty of Environment, Science and Economy
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