Molecular dynamics simulation of heat pulse propagation in y-junction carbon nanotubes

Aron Cummings; Mohamed Osman; Deepak Srivastava; Madhu Menon

doi:10.1117/12.591027

13 April 2005 Molecular dynamics simulation of heat pulse propagation in y-junction carbon nanotubes

Aron Cummings, Mohamed Osman, Deepak Srivastava, Madhu Menon

Proceedings Volume 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX; (2005) https://doi.org/10.1117/12.591027
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

Abstract

Molecular dynamics simulations have been used to investigate the nature of heat pulse propagation through a Y-junction carbon nanotube consisting of a (14,0) trunk splitting into a pair of (7,0) branches. For comparison, these simulations were also carried out on straight (7,0) and (14,0) carbon nanotubes. Simulations of the Y-junction nanotube were run in three different configurations: with the heat pulse originating in the trunk, in one of the branches, or in both of the branches simultaneously. All of the simulations were run at 0K, and the length of the pulse was 1ps. Results have shown that the heat pulse excites a variety of traveling phonon modes. It has been found that the junction impedes the propagation of these modes. Furthermore, it has been observed that traveling modes originating in the trunk pass through the junction more easily than those originating in the branches. This provides preliminary evidence for anisotropic heat flow in Y-junction nanotube structures at low temperatures. Finally, it is possible for a single phonon mode passing through the junction to generate multiple phonon modes on the other side, all with velocities less than or equal to the original mode.

Citation Download Citation

Aron Cummings, Mohamed Osman, Deepak Srivastava, and Madhu Menon "Molecular dynamics simulation of heat pulse propagation in y-junction carbon nanotubes", Proc. SPIE 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX, (13 April 2005); https://doi.org/10.1117/12.591027

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