Coherent Longitudinal Acoustic Phonon Approaching THz Frequency in Multilayer Molybdenum Disulphide

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	Coherent Longitudinal Acoustic Phonon Approaching THz Frequency in Multilayer Molybdenum Disulphide
	Ge, SF ; Liu, XF ; Qiao, XA ; Wang, QS ; Xu, Z ; Qiu, J ; Tan, PH ; Zhao, JM ; Sun, D
刊名	SCIENTIFIC REPORTS
	2014
卷号	4
ISSN号	2045-2322
通讯作者	Sun, D (reprint author), Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China.
中文摘要	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(star)10(3) m/s in MoS2. The generation mechanisms of the coherent acoustic phonon are also discussed through pump power dependent measurement.
资助信息	National Basic Research Program of China (973) [2012CB921300, 2014CB920900]; National Natural Science Foundation of China (NSFC) [11274015, 11225421, 11274372]; Recruitment Program of Global Experts; Specialized Research Fund for the Doctoral Program of Higher Education of China [20120001110066]; Beijing Natural Science Foundation [4142024]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59710]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Ge, SF,Liu, XF,Qiao, XA,et al. Coherent Longitudinal Acoustic Phonon Approaching THz Frequency in Multilayer Molybdenum Disulphide[J]. SCIENTIFIC REPORTS,2014,4.
APA	Ge, SF.,Liu, XF.,Qiao, XA.,Wang, QS.,Xu, Z.,...&Sun, D.(2014).Coherent Longitudinal Acoustic Phonon Approaching THz Frequency in Multilayer Molybdenum Disulphide.SCIENTIFIC REPORTS,4.
MLA	Ge, SF,et al."Coherent Longitudinal Acoustic Phonon Approaching THz Frequency in Multilayer Molybdenum Disulphide".SCIENTIFIC REPORTS 4(2014).