Defect-induced circulating thermal current in graphene with nanosized width

Masahiro Morooka, Takahiro Yamamoto, and Kazuyuki Watanabe
Phys. Rev. B 77, 033412 – Published 22 January 2008

Abstract

A unique thermal transport mechanism has been predicted in graphene nanoribbons with Stone-Wales defects via two complementary approaches: the nonequilibrium Green’s function method and the phonon-wave packet scattering method. In the low-energy region, the thermal current is carried by phonons with wavelength longer than the defect size, which flows ballistically along the edges of the ribbons. In contrast, high-energy phonons, with short wavelengths, are strongly scattered. The phonon transmission is reduced to zero for a specific phonon energy and a noticeable circulating thermal current is observed in the heptagonal rings of the Stone-Wales defect around the zero-transmission point.

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  • Received 2 October 2007

DOI:https://doi.org/10.1103/PhysRevB.77.033412

©2008 American Physical Society

Authors & Affiliations

Masahiro Morooka1, Takahiro Yamamoto1,2, and Kazuyuki Watanabe1,2

  • 1Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
  • 2CREST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

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Issue

Vol. 77, Iss. 3 — 15 January 2008

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