SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 40: Stochastic Thermodynamics

DY 40.3: Vortrag

Donnerstag, 30. März 2023, 10:30–10:45, ZEU 250

Work extraction potential for a single spin in equilibrium with a non-isotropic environment — •Felix Hartmann1 and Janet Anders1,21Institut für Physik und Astronomie, University of Potsdam, 14476 Potsdam, Germany — 2Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK

Thermal equilibrium properties of nanoscale systems deviate from standard macroscopic predictions due to a non-negligible coupling to the environment. For non-isotropic three-dimensional materials, we derive the mean force corrections to the equilibrium state of a single classical spin vector. The result is valid at arbitrary coupling strength.

Specifically, we consider cubic, orthorhombic, and monoclinic symmetries, and compare differences in their spin expectation values as a function of temperature. We underpin the correctness of the mean force state by evidencing its match to the steady state of the simulated non-Markovian spin dynamics. Our results show an explicit dependence on the symmetry of the material in which the spin is confined.

Further, we quantify how the mean force-generated inhomogeneities in the energy shells lead to a work extraction potential. Such inhomogeneities constitute a classical equivalent to quantum coherences.

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