TY - JOUR
T1 - Specific heat of graphene nanoribbons
AU - Xia, Minggang
AU - Song, Yang
AU - Zhang, Shengli
PY - 2011/10/3
Y1 - 2011/10/3
N2 - We studied the specific heat of graphene nanoribbons (GNRs) using an extended force constant model. We found that at low temperature, the specific heat decreases, and its variation with temperature increases with increasing GNR width. However, the specific heat increases with increasing GNR width after crossing a chaotic region. Free boundary conditions, -CHOH-terminated and armchair-edge-induced phonon nondegeneracy, shift and distortion and localized vibrational modes significantly influence GNR specific heat compared with periodic boundary conditions and bare and zigzag edges in GNRs. Finally, we found a uniform expression for specific heat vs. width at every temperature except for the chaotic region.
AB - We studied the specific heat of graphene nanoribbons (GNRs) using an extended force constant model. We found that at low temperature, the specific heat decreases, and its variation with temperature increases with increasing GNR width. However, the specific heat increases with increasing GNR width after crossing a chaotic region. Free boundary conditions, -CHOH-terminated and armchair-edge-induced phonon nondegeneracy, shift and distortion and localized vibrational modes significantly influence GNR specific heat compared with periodic boundary conditions and bare and zigzag edges in GNRs. Finally, we found a uniform expression for specific heat vs. width at every temperature except for the chaotic region.
KW - Graphene nanoribbons
KW - Specific heat
UR - https://www.scopus.com/pages/publications/80052963813
U2 - 10.1016/j.physleta.2011.08.037
DO - 10.1016/j.physleta.2011.08.037
M3 - 文章
AN - SCOPUS:80052963813
SN - 0375-9601
VL - 375
SP - 3726
EP - 3730
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 42
ER -