Phonon focusing and features of phonon transport in silicon nanofilms and nanowires at low temperatures

2014 ◽  
Vol 252 (2) ◽  
pp. 323-332 ◽  
Author(s):  
I. I. Kuleyev ◽  
I. G. Kuleyev ◽  
S. M. Bakharev
Keyword(s):  
Low Temperatures ◽  
Phonon Transport ◽  
Phonon Focusing

Radiative ballistic phonon transport in silicon-nitride membranes at low temperatures

2005 ◽  
Vol 86 (25) ◽  
pp. 251903 ◽  
Author(s):  
H. F. C. Hoevers ◽  
M. L. Ridder ◽  
A. Germeau ◽  
M. P. Bruijn ◽  
P. A. J. de Korte ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Low Temperatures ◽  
Phonon Transport

Atomistic Visualization of Ballistic Phonon Transport

2007 ◽  
Author(s):  
Neil Zuckerman ◽  
Jennifer R. Lukes
Keyword(s):  
Heat Transfer ◽  
High Frequency ◽  
Energy Transport ◽  
Imaging Techniques ◽  
Phonon Transport ◽  
Dynamics Simulation ◽  
Short Time Scale ◽  
Ballistic Phonons ◽  
Short Time ◽  
Phonon Focusing

Heat transfer in solid materials at short time scales, short length scales, and low temperatures is governed by the transport of ballistic phonons. In anisotropic crystals, the energy carried by these phonons is strongly channeled into well-defined directions in a phenomenon known as phonon focusing. Presented here is a new molecular dynamics simulation approach for visualizing acoustic phonon focusing in anisotropic crystals. An advantage of this approach over experimental phonon imaging techniques is that it allows examination of phonon propagation at selected modes and frequencies. The spatial, mode, and frequency dependence of ballistic energy transport gained with this approach will be useful for understanding heat transfer issues in high frequency electronics and short time scale laser-material interactions.

THERMAL TRANSPORT BY BALLISTIC PHONON IN A SEMICONDUCTOR RECTANGULAR QUANTUM WIRE MODULATED WITH QUANTUM DOT

2009 ◽  
Vol 23 (30) ◽  
pp. 3597-3607 ◽  
Author(s):  
XIAO-YAN YU ◽  
XIAO-FANG PENG ◽  
KE-QIU CHEN
Keyword(s):  
Quantum Dot ◽  
Thermal Transport ◽  
Low Temperatures ◽  
Quantum Wire ◽  
Thermal Conductance ◽  
Phonon Transport ◽  
Total Transmission ◽  
Coefficient Versus ◽  
Increasing Temperature ◽  
Scattering Matrix Method

Thermal transport by ballistic phonon in a semiconductor rectangular quantum wire modulated with quantum dot at low temperatures is investigated with the use of the scattering matrix method. The calculated results show that the total transmission coefficient versus the reduced phonon frequency exhibits interesting characteristics such as inhomogeneous quantum transport steps. Quantized thermal conductance plateau can be observed at low temperatures, and the thermal conductance is not increased monotonically with increasing temperature. The results also show that the phonon transport probability and thermal conductance can be controlled to a certain degree by adjusting the parameters of the proposed quantum structure.

Phonon Focusing and Phonon Transport

2020 ◽  
Author(s):  
Igor Gaynitdinovich Kuleyev ◽  
Ivan Igorevich Kuleyev ◽  
Sergey Mikhailovich Bakharev ◽  
Vladimir Vasilyevich Ustinov
Keyword(s):  
Phonon Transport ◽  
Phonon Focusing

BALLISTIC PHONON TRANSPORT THROUGH GAUSSIAN ACOUSTIC NANOCAVITIES

2011 ◽  
Vol 25 (19) ◽  
pp. 1631-1642 ◽  
Author(s):  
SHU-JUAN LI ◽  
GUI-FANG HUANG ◽  
YUAN CHEN ◽  
WEI-QING HUANG ◽  
WANGYU HU ◽  
...  
Keyword(s):  
Band Gap ◽  
Low Temperatures ◽  
Gaussian Function ◽  
Thermal Conductance ◽  
Wide Band ◽  
Phonon Transport ◽  
Transmission Spectra ◽  
Wide Band Gap ◽  
Semiconductor Nanowire ◽  
Ballistic Phonons

We investigate ballistic phonon transport through Gaussian acoustic nanocavities in a semiconductor nanowire at low temperatures. When the transverse widths of acoustic nanocavities takes a Gaussian function, it is found that wide band gap and resonant peaks appear in transmission spectra. The phonon-cavity confined modes exist as the number of the nanocavities is large. The phonon transmission and thermal conductance strongly depend on the number and length of nanocavities. The results suggest that the Gaussian acoustic nanocavities may be useful for controlling thermal conductance artificially and the design of phonon devices to manipulate ballistic phonons in nanophononics.

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