We investigate nonequilibrium steady states in a class of one-dimensional diffusive systems that can attain negative absolute temperatures. The cases of a paramagnetic spin system, a Hamiltonian rotator chain and a one-dimensional discrete linear Schrödinger equation are considered. Suitable models of reservoirs are implemented to impose given, possibly negative, temperatures at the chain ends. We show that a phenomenological description in terms of a Fourier law can consistently describe unusual transport regimes where the temperature profiles are entirely or partially in the negative-temperature region. Negative-temperature Fourier transport is observed both for deterministic and stochastic dynamics and it can be generalized to coupled transport when two or more thermodynamic currents flow through the system.

Negative-temperature Fourier transport in one-dimensional systems / Baldovin, M.; Iubini, S.. - In: JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT. - ISSN 1742-5468. - 2021:5(2021), p. 053202. [10.1088/1742-5468/abf7bd]

Negative-temperature Fourier transport in one-dimensional systems

Baldovin M.
Primo
;
2021

Abstract

We investigate nonequilibrium steady states in a class of one-dimensional diffusive systems that can attain negative absolute temperatures. The cases of a paramagnetic spin system, a Hamiltonian rotator chain and a one-dimensional discrete linear Schrödinger equation are considered. Suitable models of reservoirs are implemented to impose given, possibly negative, temperatures at the chain ends. We show that a phenomenological description in terms of a Fourier law can consistently describe unusual transport regimes where the temperature profiles are entirely or partially in the negative-temperature region. Negative-temperature Fourier transport is observed both for deterministic and stochastic dynamics and it can be generalized to coupled transport when two or more thermodynamic currents flow through the system.
2021
heat conduction; stationary states; transport processes/heat transfer
01 Pubblicazione su rivista::01a Articolo in rivista
Negative-temperature Fourier transport in one-dimensional systems / Baldovin, M.; Iubini, S.. - In: JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT. - ISSN 1742-5468. - 2021:5(2021), p. 053202. [10.1088/1742-5468/abf7bd]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1566574
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