Journal
PHYSICS LETTERS A
Volume 377, Issue 43, Pages 3144-3147Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2013.09.032
Keywords
Thermal conductivity; Nanowires; Phonon-phonon interactions
Categories
Funding
- National Natural Science Foundation of China [11274105, 91227125]
- National Basic Research Program of China [2012CB932703, 2011CB606405]
- Hunan Provincial Natural Science Foundation of China [12JJ2002]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics
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We investigate the phonon thermal transport properties in InAs nanowires with different size and growth directions by using nonequilibrium molecular dynamics methods. The results show a remarkable anisotropy for the thermal conductivity in InAs nanowire. It is found that the thermal conductivity along [110] growth direction is about three times larger than that along [100] or [111] direction. With the increase of temperature, the thermal conductivity along [110] direction decreases significantly. However, the thermal conductivity along other two directions is not sensitive to temperature. Moreover, we find a crossover from ballistic to ballistic-diffusive thermal transport for a certain length of InAs nanowire. A brief physical analysis of these results is given. It is suggested that the anisotropy of thermal conductivity is common for nanowires with zinc blende structures. (C) 2013 Elsevier B.V. All rights reserved.
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