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Title: Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations

Abstract

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 T{sup n}, 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.

Authors:
 [1];  [2];  [1];  [3]
  1. E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, Chisinau MD-2009, Republic of Moldova (Moldova, Republic of)
  2. (United States)
  3. Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521 (United States)
Publication Date:
OSTI Identifier:
22311130
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; GRAPHENE; INTERACTIONS; LAYERS; PHONONS; ROTATION; SPECIFIC HEAT; SPHERICAL CONFIGURATION; SYMMETRY; T-15 TOKAMAK; TEMPERATURE RANGE 0000-0013 K

Citation Formats

Nika, Denis L., Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521, Cocemasov, Alexandr I., and Balandin, Alexander A., E-mail: balandin@ee.ucr.edu. Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations. United States: N. p., 2014. Web. doi:10.1063/1.4890622.
Nika, Denis L., Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521, Cocemasov, Alexandr I., & Balandin, Alexander A., E-mail: balandin@ee.ucr.edu. Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations. United States. doi:10.1063/1.4890622.
Nika, Denis L., Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521, Cocemasov, Alexandr I., and Balandin, Alexander A., E-mail: balandin@ee.ucr.edu. Mon . "Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations". United States. doi:10.1063/1.4890622.
@article{osti_22311130,
title = {Specific heat of twisted bilayer graphene: Engineering phonons by atomic plane rotations},
author = {Nika, Denis L. and Nano-Device Laboratory, Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California—Riverside, Riverside, California, 92521 and Cocemasov, Alexandr I. and Balandin, Alexander A., E-mail: balandin@ee.ucr.edu},
abstractNote = {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 T{sup n}, 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.},
doi = {10.1063/1.4890622},
journal = {Applied Physics Letters},
number = 3,
volume = 105,
place = {United States},
year = {Mon Jul 21 00:00:00 EDT 2014},
month = {Mon Jul 21 00:00:00 EDT 2014}
}