| Conţinutul numărului revistei |
| Articolul precedent |
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 SM ISO690:2012NIKA, Denis, COCEMASOV, Alexandr, BALANDIN, Alexander A.. Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations. In: Applied Physics Letters, 2014, vol. 105, pp. 1-16. ISSN 0003-6951. DOI: https://doi.org/10.1063/1.4890622 |
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  Applied Physics Letters |
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| Volumul 105 / 2014 / ISSN 0003-6951 /ISSNe 1077-3118 | ||||||
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| DOI:https://doi.org/10.1063/1.4890622 | ||||||
| Pag. 1-16 | ||||||
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We have studied the phonon specific heat in single-layer, bilayer, and twisted bilayer graphene. The calculations were performed using the Born-von Karman model of lattice dynamics for intralayer atomic interactions and spherically symmetric interatomic potential for interlayer interactions. We found that at temperature T < 15 K, specific heat varies with temperature as Tn, where n = 1 for graphene, n = 1.6 for bilayer graphene, and n = 1.3 for the twisted bilayer graphene. The phonon specific heat reveals an intriguing dependence on the twist angle in bilayer graphene, which is particularly pronounced at low temperature. The results suggest a possibility of phonon engineering of thermal properties of layered materials by twisting the atomic planes. |
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| Cuvinte-cheie atoms, Crystal lattices, graphene, Materials properties, phonons, temperature |
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