scholarly journals Characteristics of acoustic phonon transport and thermal conductance in multi-terminal graphene junctions

2016 ◽  
Vol 65 (8) ◽  
pp. 086301
Author(s):  
Qing Qian-Jun ◽  
Zhou Xin ◽  
Xie Fang ◽  
Chen Li-Qun ◽  
Wang Xin-Jun ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Thermal Conductance ◽  
Phonon Transport

Acoustic phonon transport and thermal conductance in a periodically modulated quantum wire

2007 ◽  
Vol 40 (5) ◽  
pp. 1497-1500 ◽  
Author(s):  
Li-Ming Tang ◽  
Lingling Wang ◽  
Wei-Qing Huang ◽  
B S Zou ◽  
Ke-Qiu Chen
Keyword(s):  
Quantum Wire ◽  
Acoustic Phonon ◽  
Thermal Conductance ◽  
Phonon Transport

Acoustic phonon transport and ballistic thermal conductance through a three-dimensional double-bend quantum structure

2008 ◽  
Vol 104 (5) ◽  
pp. 054312 ◽  
Author(s):  
Fang Xie ◽  
Ke-Qiu Chen ◽  
Y. G. Wang ◽  
Qing Wan ◽  
B. S. Zou ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Three Dimensional ◽  
Thermal Conductance ◽  
Phonon Transport ◽  
Quantum Structure

THE COMPARING OF ACOUSTIC PHONON TRANSPORT ABOUT MONOCHROMATIC MODE AND MIXING MODE THROUGH A DOUBLE T-SHAPED QUANTUM WAVEGUIDE

2011 ◽  
Vol 25 (30) ◽  
pp. 2313-2321 ◽  
Author(s):  
GUO-JUN YI ◽  
KE-MIN LI ◽  
LI-MING TANG ◽  
XIAO-HUA CHEN
Keyword(s):  
Thermal Conductivity ◽  
Acoustic Phonon ◽  
Mode Conversion ◽  
Coupling Effect ◽  
Thermal Conductance ◽  
Scattering Matrix ◽  
Phonon Transport ◽  
Sh Wave ◽  
Quantum Waveguide ◽  
Scattering Matrix Method

We compare the thermal conductance of SH mode and mixing mode of acoustic phonons in a double T-shaped quantum waveguide at low enough temperatures by using the scattering-matrix method, and analyze the influence from mode conversion. Our results show that the small changes of the geometric parameters can induce different variation on the thermal conductivity, where the effect of the stub height of SH wave is the strongest. Moreover, the mode conversion plays an important role on the thermal conductivity, especially at the higher temperatures, and the coupling effect between two stubs at mixing mode is larger than that at single SH mode.

ACOUSTIC PHONON TRANSPORT THROUGH A QUANTUM WAVEGUIDE WITH TWO PARTLY-OVERLAPPED STUBS

2009 ◽  
Vol 23 (19) ◽  
pp. 2353-2360
Author(s):  
HONGJIAN LI ◽  
SHUHUAN YAN ◽  
HAIYAN ZHANG ◽  
SUXIA XIE ◽  
XIN ZHOU
Keyword(s):  
Low Temperature ◽  
Acoustic Phonon ◽  
Ballistic Transport ◽  
Thermal Conductance ◽  
Scattering Matrix ◽  
Phonon Transport ◽  
Quantum Waveguide ◽  
Mode Splitting ◽  
Scattering Matrix Method ◽  
Stress Free Boundary

By using the scattering matrix method, we investigate the effect of two partly-overlapped stubs in a quantum waveguide on acoustic phonon transport and thermal conductance at low temperature. We demonstrate that the transmission coefficient is of the quantum characteristic and shows obvious discrepancies for the different discontinuity structures. The number of the stop-frequency depends on the value of the stubs' heights and ballistic transport for the mode 0 is possible when the stress-free boundary conduction is used. In addition, the thermal conductance exhibits mode-splitting behavior and sensitively depends on the heights and widths of the two partly-overlapped stubs.

Acoustic phonon transport and thermal conductance in a multiple channels nanostructure

2007 ◽  
Vol 364 (3-4) ◽  
pp. 343-347 ◽  
Author(s):  
Liu-Ying Nie ◽  
Lingling Wang ◽  
L.H. Zhao ◽  
Ke-Qiu Chen
Keyword(s):  
Acoustic Phonon ◽  
Thermal Conductance ◽  
Phonon Transport ◽  
Multiple Channels

Thermal Conductance of Nanoparticles: A Study of Phonon Transport in Functionalized Nanodiamond Suspensions

2020 ◽  
Author(s):  
Aaron Bain ◽  
Ethan Languri ◽  
Venkat Padmanabhan ◽  
Jim Davidson ◽  
David Kerns
Keyword(s):  
Thermal Conductivity ◽  
Density Functional ◽  
Transport Theory ◽  
Constitutive Relations ◽  
Thermal Conductance ◽  
Phonon Transport ◽  
Suspension Stability ◽  
Kapitza Resistance ◽  
Conductivity Enhancement ◽  
Underlying Mechanisms

Abstract Nanoparticle additives, with their anomalous thermal conductivity, have attracted attention in research and industry as a novel mode of enhancing the heat transfer mediums. Most studies conducted on nanoparticle suspensions in liquids, pastes, or composites at present have relied on constitutive relations using properties of the bulk substance and of the nanoparticle to explain the effective thermal conductivity. In order to utilize nanoparticles in real world engineering applications, chemical functionalization of the surface of the nanoparticle is frequently employed, either to suspend in liquid applications or to stabilize in arrays. In this study, we have sought to explain the underlying mechanisms of thermal conductivity enhancement taking into consideration the nanoscale effects, such as phonon transport in the nanoparticle coupled with vibrational modes of the surface functional molecules, in order to tailor the functional groups not only for suspension stability but also for minimizing Kapitza resistance at the surface of the nanoparticle. Density functional theory simulations in SIESTA and equilibrium transport theory analysis via GOLLUM2 were used in tandem to evaluate the thermal transport at the nanoparticle to surface ligand junction. By treating the nanoparticle surface and the polymer or acid coating as distinct homogeneous substrates, a model for thermal conductivity becomes more tractable.

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