Journal
JOURNAL OF APPLIED PHYSICS
Volume 117, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4915887
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Funding
- National Natural Science Foundation of China [11404110]
- Nature Science Foundation of Hunan Province [14JJ3139]
- Outstanding Young Program of Hunan Provincial Education Department of China [14B046]
- Key Research Program of Hunan Provincial Education Department, China [12A059]
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We investigate acoustic phonon transmission and thermal conductance in three dimensional (3D) quasi-periodically stubbed waveguides according to the Fibonacci sequence. Results show that the transmission coefficient exhibits the periodic oscillation upon varying the length of stub/waveguide at low frequency, and the period of such oscillation is tunably decreased with increasing the Fibonacci number N. Interestingly, there also exist some anti-resonant dips that gradually develop into wide stop-frequency gaps with increasing N. As the temperature goes up, a transition of the thermal conductance from the decrease to the increase occurs in these systems. When N is increased, the thermal conductance is approximately decreased with a linear trend. Moreover, the decreasing degree sensitively depends on the variation of temperature. A brief analysis of these results is given. (C) 2015 AIP Publishing LLC.
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