The zeroth law in structural glasses: an example

Autor:	Adan Garriga
Rok vydání:	2002
Předmět:	Physics Thermal fluctuations Effective temperature Condensed Matter Physics symbols.namesake Thermalisation Thermal conductivity Zeroth law of thermodynamics Law symbols Parallel dynamics General Materials Science Hamiltonian (quantum mechanics) Harmonic oscillator
Zdroj:	Journal of Physics: Condensed Matter. 14:1581-1588
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/14/7/315
Popis:	We investigate the validity of a zeroth thermodynamic law for non-equilibrium systems. In order to describe the thermodynamics of the glassy systems, it has been introduced an extra parameter, the effective temperature which generalizes the fluctuation-dissipation theorem (FDT) to off-equilibrium systems and supposedly describes thermal fluctuations around the aging state. In particular we analyze two coupled systems of harmonic oscillators with Monte Carlo dynamics. We study in detail two types of dynamics: sequential dynamics, where the coupling between the subsystems comes only from the Hamiltonian; and parallel dynamics where there is another source of coupling: the dynamics. We show how in the first case the effective temperatures of the two interacting subsystems are different asymptotically due to the smallness of the thermal conductivity in the aging regime. This explains why, in structural glasses, different interacting degrees of freedom can stay at different effective temperatures, and never thermalize.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0c59bca121998ecb3b33b3853271680 https://doi.org/10.1088/0953-8984/14/7/315 Zobrazit plný text záznamu