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Ballistic thermal conductance in a three-dimensional quantum wire modulated with stub structure
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10.1063/1.2737363
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Affiliations:
1 Department of Applied Physics, Hunan University, Changsha 410082, China
2 Department of Physics, Capital Normal University, Beijing 100037, China
a) Author to whom correspondence should be addressed; electronic mail: keqiuchen@hnu.cn
Appl. Phys. Lett. 90, 193502 (2007)
/content/aip/journal/apl/90/19/10.1063/1.2737363
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/19/10.1063/1.2737363
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Figures

FIG. 1.

Structure of a nanowire wire with a stub.

FIG. 2.

Thermal conductance divided by temperature , which is reduced by the zero-temperature universal value , as a function of the reduced temperature for different structural parameters and boundary conditions. (a1) and (b1) describe the total thermal conductance for different stub lengths : (a1) and (b1) correspond to stress-free and hard wall boundary conditions, respectively. Solid, dashed, and dotted curves correspond to , 15, and , respectively. Here, we take , , and . (a2) and (b2) describe the total thermal conductance for different thicknesses: (a2) and (b2) correspond to stress-free and hard wall boundary conditions, respectively. Solid, dashed, and dotted curves correspond to , respectively, and the dash-dotted curve was calculated by the 2D model. Here, we take , , and . (a3) and (b3) describe the total thermal conductance for different thicknesses but with fixed : (a3) and (b3) correspond to stress-free and hard wall boundary conditions, respectively. Solid, dashed, and dotted curves correspond to , 7.5, and , respectively. Here, we take , , , and . Note that in the calculations only 16 acoustic phonon modes [namely (0,0)–(0,3), (1,0)–(1,3), (2,0)–(2,3), and (3,0)–(3,3) modes] can make their contributions to the thermal conductance for the explored temperature range.

/content/aip/journal/apl/90/19/10.1063/1.2737363
2007-05-08
2014-04-18

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