Thermodynamics of quantum crystalline membranes

We investigate the thermodynamic properties and the lattice stability of two-dimensional crystalline membranes, such as graphene and related compounds, in the low-temperature quantum regime T arrow right 0. A key role is played by the anharmonic coupling between inplane and outofplane lattice modes...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-06, Vol.89 (22), Article 224307
Hauptverfasser: Amorim, B., Roldán, R., Cappelluti, E., Fasolino, A., Guinea, F., Katsnelson, M. I.
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container_title Physical review. B, Condensed matter and materials physics
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creator Amorim, B.
Roldán, R.
Cappelluti, E.
Fasolino, A.
Guinea, F.
Katsnelson, M. I.
description We investigate the thermodynamic properties and the lattice stability of two-dimensional crystalline membranes, such as graphene and related compounds, in the low-temperature quantum regime T arrow right 0. A key role is played by the anharmonic coupling between inplane and outofplane lattice modes that, in the quantum limit, has very different consequences from those in the classical regime. The role of retardation, namely of frequency dependence, in the effective anharmonic interactions turns out to be crucial in the quantum regime. We identify a crossover temperature, T*, between the classical and quantum regimes, which is ~ 70-90 K for graphene. Below T*, the heat capacity and thermal expansion coefficient decrease as power laws with decreasing temperature, tending to zero for T arrow right 0 as required by the third law of thermodynamics.
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source American Physical Society Journals
subjects Anharmonicity
Condensed matter
Crossovers
Crystal structure
Graphene
Lattices
Membranes
Thermal expansion
Thermodynamics
title Thermodynamics of quantum crystalline membranes
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