Phonon Focusing Effect in an Atomic Level Triangular Structure
Jian-Hui Jiang, Shuang Lu, and Jie Chen*
Center for Phononics and Thermal Energy Science, China–EU Joint Lab for Nanophononics, MOE Key Laboratory of Advanced Micro-structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
Abstract ：The rise of artificial microstructures has made it possible to modulate propagation of various kinds of waves, such as light, sound and heat. Among them, the focusing effect is a modulation function of particular interest. We propose an atomic level triangular structure to realize the phonon focusing effect in single-layer graphene. In the positive incident direction, our phonon wave packet simulation results confirm that multiple features related to the phonon focusing effect can be controlled by adjusting the height of the triangular structure. More interestingly, a completed different focusing pattern and an enhanced energy transmission coefficient are found in the reverse incident direction. The detailed mode conversion physics is discussed based on the Fourier transform analysis on the spatial distribution of the phonon wave packet. Our study provides physical insights to achieving phonon focusing effect by designing atomic level microstructures.
收稿日期: 2023-06-25
Editors' Suggestion
出版日期: 2023-08-31
PACS:
63.22.Rc
(Phonons in graphene)
63.22.-m
(Phonons or vibrational states in low-dimensional structures and nanoscale materials)
81.05.ue
(Graphene)
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2023, Vol. 40 
