scholarly journals Acoustic phonon transport and thermal conductance in one-dimensional quantum waveguide modulated with quantum dots

2011 ◽  
Vol 60 (12) ◽  
pp. 126802
Author(s):  
Peng Xiao-Fang ◽  
Wang Xin-Jun ◽  
Gong Zhi-Qiang ◽  
Chen Li-Qun
Keyword(s):  
Quantum Dots ◽  
Acoustic Phonon ◽  
Thermal Conductance ◽  
Phonon Transport ◽  
Quantum Waveguide ◽  
One Dimensional

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.

Thermal conductance in a quantum waveguide modulated with quantum dots

2008 ◽  
Vol 40 (9) ◽  
pp. 2862-2868 ◽  
Author(s):  
Ling-Jiang Yao ◽  
Lingling Wang ◽  
Xiao-Fang Peng ◽  
B.S. Zou ◽  
Ke-Qiu Chen
Keyword(s):  
Quantum Dots ◽  
Thermal Conductance ◽  
Quantum Waveguide

Acoustic phonon transport through a T-shaped quantum waveguide

2004 ◽  
Vol 16 (28) ◽  
pp. 5049-5059 ◽  
Author(s):  
Wen-Xia Li ◽  
Ke-Qiu Chen ◽  
Wenhui Duan ◽  
Jian Wu ◽  
Bing-Lin Gu
Keyword(s):  
Acoustic Phonon ◽  
Phonon Transport ◽  
Quantum Waveguide

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

Thermal transport of small systems

2017 ◽  
Author(s):  
Takahiro Yamamoto ◽  
Kazuyuki Watanabe ◽  
Satoshi Watanabe
Keyword(s):  
Thermal Transport ◽  
Thermal Conductance ◽  
Transmission Function ◽  
Mean Free Path ◽  
Phonon Transport ◽  
Fourier Law ◽  
Small Systems ◽  
One Dimensional ◽  
Sample Dimension ◽  
The Mean

This article focuses on the phonon transport or thermal transport of small systems, including quasi-one-dimensional systems such as carbon nanotubes. The Fourier law well describes the thermal transport phenomena in normal bulk materials. However, it is no longer valid when the sample dimension reduces down to below the mean-free path of phonons. In such a small system, the phonons propagate coherently without interference with other phonons. The article first considers the Boltzmann–Peierls formula of diffusive phonon transport before discussing coherent phonon transport, with emphasis on the Landauer formulation of phonon transport, ballistic phonon transport and quantized thermal conductance, numerical calculation of the phonon-transmission function, and length dependence of the thermal conductance.

Acoustic phonon transport through a quantum waveguide with two stubs

2007 ◽  
Vol 40 (19) ◽  
pp. 6105-6111 ◽  
Author(s):  
Hai-Yan Zhang ◽  
Hong-Jian Li ◽  
Wei-Qing Huang ◽  
Su-Xia Xie
Keyword(s):  
Acoustic Phonon ◽  
Phonon Transport ◽  
Quantum Waveguide
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