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Acoustic phonon transport and ballistic thermal conductance through a three-dimensional double-bend quantum structure
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10.1063/1.2975979
/content/aip/journal/jap/104/5/10.1063/1.2975979
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/5/10.1063/1.2975979
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of the 3D double-bend quantum structure. , , and denote the height of regions I, II, and III of the structure, respectively. The thickness of regions I, II, and III are all the same in our calculation and denoted by , , and , respectively. The height and denote the width of bend region II.

Image of FIG. 2.
FIG. 2.

Total transmission probability as the function of the reduced frequency of the incident phonons for the different geometry parameters. and are the acoustic wave velocity in the quantum wire. Here, we take , , and . (a) corresponds to the transmission coefficient for and . (b) corresponds to and , and (c) corresponds to and . Dot-dashed, dotted, dashed, and solid curves correspond to , 2, 12, and 15 nm, respectively. Three consecutive curves are vertically offset by one unit for clarity.

Image of FIG. 3.
FIG. 3.

The thermal conductance divided by temperature , which is reduced by the zero-temperature universal value , as the function of the reduced temperature for different thicknesses. Here we take , , and . The dot-dashed, dashed, and solid curves correspond to , 12, and 15 nm, respectively. (a) is for the total thermal conductance, and (b)–(f) are for the thermal conductance of modes (0, 0),(0, 1),(0, 2),(1, 0), and (1, 1), respectively.

Image of FIG. 4.
FIG. 4.

The thermal conductance divided by temperature , which is reduced by the zero-temperature universal value , as the function of the reduced temperature for different structure parameters. Here we take and . (a) is for different bend heights . Here, the width and the dot-dashed, dashed, solid, and dot curves describe the thermal conductances of , 5, 15, and 18 nm, respectively. (b) is for different bend lengths . Here, and the dot-dashed, dashed, solid, and dot curves describe the thermal conductances of , 12, 15, and 18 nm, respectively.

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/content/aip/journal/jap/104/5/10.1063/1.2975979
2008-09-09
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Acoustic phonon transport and ballistic thermal conductance through a three-dimensional double-bend quantum structure
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/5/10.1063/1.2975979
10.1063/1.2975979
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