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Selective transport of ballistic phonon modes by an acoustic nanocavity in a -shaped semiconductor nanowire
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10.1063/1.2975344
/content/aip/journal/jap/104/5/10.1063/1.2975344
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/5/10.1063/1.2975344
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the -shaped semiconductor nanowire. denotes the distance between channel C and coordinate; the distance between channels A and B. The length and width of the nanocavity are and , respectively. Here, it should be noted that the distance between channel B and coordinate is permitted to take a negative value.

Image of FIG. 2.
FIG. 2.

Transmission coefficients vs : (a1)–(a3) and (b1)–(b3) correspond to the zeroth and first modes, respectively. (a1) and (b1): , ; (a2) and (b2): ; (a3) and (b3): , . The incident frequency is ( is the acoustic wave velocity). The curves marked with A, B, and C denote the transmission through channels A, B, and C, respectively. Here, we take , , and . The insets show the calculated structures with different parameters. It is worth noting that due to the nanowire being a symmetry structure, the transmission coefficients of channels A and C are equal.

Image of FIG. 3.
FIG. 3.

Transmission coefficients vs for different widths of channels A and C: (a1)–(a3) and (b1)–(b3) correspond to the zeroth and first modes, respectively. (a1) and (b1): ; (a2) and (b2): ; (a3) and (b3): . Here, we take , , and . Others are the same as those in Fig. 2. Note that the transmission coefficient of the first mode though channel B is nearly superposed on the coordinate in Figs. 3(b1)–3(b3).

Image of FIG. 4.
FIG. 4.

Transmission coefficients vs : (a) and (b) correspond to the zeroth and first modes, respectively. The incident frequency is . Here, we take , , , and . Others are the same as those in Fig. 3.

Image of FIG. 5.
FIG. 5.

Transmission coefficients vs the length of the cavity: (a)–(d) correspond to the zeroth to third modes, respectively. Here, . The incident frequency is . Others are the same as those in Fig. 4.

Image of FIG. 6.
FIG. 6.

Thermal conductance divided by temperature reduced by the zero-temperature universal value as a function of the reduced temperature : (a), (b), and (c) correspond to , 30, and 60 nm, respectively. The curves marked with , , and denote the total thermal conductance, the thermal conductance of zeroth and first modes through channel A (B or C), respectively. Here, we take . Other parameters are the same as those in Fig. 3.

Image of FIG. 7.
FIG. 7.

Thermal conductance divided by temperature reduced by the zero-temperature universal value as a function of the reduced temperature . Here, we take . Other parameters are the same as those in Fig. 4

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/content/aip/journal/jap/104/5/10.1063/1.2975344
2008-09-08
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Selective transport of ballistic phonon modes by an acoustic nanocavity in a Ψ-shaped semiconductor nanowire
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/5/10.1063/1.2975344
10.1063/1.2975344
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