Quantization of Acoustic Modes in Dumbbell Nanoparticles
Quantization of Acoustic Modes in Dumbbell Nanoparticles
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哑铃纳米粒子中声学模式的量化
DOI：
10.1103/physrevlett.128.048003
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发表时间：
2022
影响因子：
8.6
通讯作者：
Fytas, George
中科院分区：
文献类型：
--
作者：
Wang, Zuyuan;Kim, Hojin;Secchi, Maria;Montagna, Maurizio;Furst, Eric M.;Djafari-Rouhani, Bahram;Fytas, George
利用布里渊光谱仪记录了哑铃型聚苯乙烯纳米粒子的振动本征模，并对实验光谱进行了理论计算。与简并度为（）的球不同，由于哑铃的轴对称性，它的本征模既可以是单简并的，也可以是双简并的。BLS光谱揭示了一个新的低频峰，这是由于哑铃形的两个瓣的异相振动。这些分子形状的哑铃状颗粒中的声学模式的量子化随着两个瓣之间的分离增加而从初级胶体球演变。
The vibrational eigenmodes of dumbbell-shaped polystyrene nanoparticles are recorded by Brillouin light spectroscopy (BLS), and the full experimental spectra are calculated theoretically. Different from spheres with a degeneracy of (), withbeing the angular momentum quantum number, the eigenmodes of dumbbells are either singly or doubly degenerate owing to their axial symmetry. The BLS spectrum reveals a new, low-frequency peak, which is attributed to the out-of-phase vibration of the two lobes of the dumbbell. The quantization of acoustic modes in these molecule-shaped dumbbell particles evolves from the primary colloidal spheres as the separation between the two lobes increases.