Coherent longitudinal acoustic phonon approaching THz frequency in multilayer Molybdenum Disulphide.

Coherent longitudinal acoustic phonon approaching THz frequency in multilayer Molybdenum Disulphide.
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多层二硫化钼中接近太赫兹频率的相干纵向声子

DOI:
10.1038/srep05722
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发表时间:
2014-07-17
期刊:
影响因子:
4.6
通讯作者:
Sun D
Sun D
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ge S;Liu X;Qiao X;Wang Q;Xu Z;Qiu J;Tan PH;Zhao J;Sun D

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利用飞秒激光脉冲在10层到1300层以上的二硫化钼(MoS 2)多层膜中产生并探测到了相干纵声声子。对于薄的MoS 2,激发的声子频率表现出驻波性质,并表现出线性依赖于样品的厚度。频率从40 GHz变化到0.2 THz(10层),这有望在THz频率机械谐振器中应用。  这种线性厚度依赖性在约150层以上的较厚样品中逐渐消失,并且振荡周期显示出对探测波长的线性依赖性。从相干声子的振荡周期和声学回波的延迟时间,我们可以推导出一个一致的声速为7.11*103米/秒的MoS 2。 通过对泵浦功率的测量,讨论了相干声子的产生机制。
Coherent longitudinal acoustic phonon is generated and detected in multilayer Molybdenum Disulphide (MoS2) with number of layers ranging from 10 to over 1300 by femtosecond laser pulse. For thin MoS2, the excited phonon frequency exhibits a standing wave nature and shows linear dependence on the sample thickness. The frequency varies from 40 GHz to 0.2 THz (10 layers), which promises possible application in THz frequency mechanical resonators. This linear thickness dependence gradually disappears in thicker samples above about 150 layers, and the oscillation period shows linear dependence on the probe wavelength. From both the oscillation period of the coherent phonon and the delay time of acoustic echo, we can deduce a consistent sound velocity of 7.11*103 m/s in MoS2. The generation mechanisms of the coherent acoustic phonon are also discussed through pump power dependent measurement.
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