Double resonance Raman modes in monolayer and few-layer MoTe2

IMR OpenIR

	Double resonance Raman modes in monolayer and few-layer MoTe2
	Guo, Huaihong; Yang, Teng; Yamamoto, Mahito; Zhou, Lin; Ishikawa, Ryo; Ueno, Keiji; Tsukagoshi, Kazuhito; Zhang, Zhidong; Dresselhaus, Mildred S.; Saito, Riichiro; hhguo@alum.imr.ac.cn; yangteng@imr.ac.cn
	2015
发表期刊	PHYSICAL REVIEW B
ISSN	1098-0121
卷号	91 期号:20 页码:-
摘要	We study the second-order Raman process of mono- and few-layer MoTe2, by combining ab initio density functional perturbation calculations with experimental Raman spectroscopy using 532, 633, and 785 nm excitation lasers. The calculated electronic band structure and the density of states show that the resonance Raman process occurs at the M point in the Brillouin zone, where a strong optical absorption occurs due to a logarithmic Van Hove singularity of the electronic density of states. The double resonance Raman process with intervalley electron-phonon coupling connects two of the three inequivalent M points in the Brillouin zone, giving rise to second-order Raman peaks due to the M-point phonons. The calculated vibrational frequencies of the second-order Raman spectra agree with the observed laser-energy-dependent Raman shifts in the experiment.
部门归属	[guo, huaihong ; yang, teng ; saito, riichiro] tohoku univ, dept phys, sendai, miyagi 9808578, japan ; [yang, teng ; zhang, zhidong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china ; [yamamoto, mahito ; tsukagoshi, kazuhito] natl inst mat sci, wpi mana, int ctr mat nanoarchitecton, tsukuba, ibaraki 3050044, japan ; [zhou, lin ; dresselhaus, mildred s.] mit, dept elect engn & comp engn, cambridge, ma 02139 usa ; [ishikawa, ryo] saitama univ, grad sch sci & engn, dept funct mat sci, saitama 3388570, japan ; [ueno, keiji] saitama univ, grad sch sci & engn, dept chem, saitama 3388570, japan ; [dresselhaus, mildred s.] mit, dept phys, cambridge, ma 02139 usa
资助者	NSFC [51331006]; Key Research Program of Chinese Academy of Sciences [KGZD-EW-T06]; MEXT [25286005, 25107005, 25107004]; NSF-DMR [1004147]
收录类别	sci
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/74729
专题	中国科学院金属研究所
通讯作者	hhguo@alum.imr.ac.cn; yangteng@imr.ac.cn
推荐引用方式 GB/T 7714	Guo, Huaihong,Yang, Teng,Yamamoto, Mahito,et al. Double resonance Raman modes in monolayer and few-layer MoTe2[J]. PHYSICAL REVIEW B,2015,91(20):-.
APA	Guo, Huaihong.,Yang, Teng.,Yamamoto, Mahito.,Zhou, Lin.,Ishikawa, Ryo.,...&yangteng@imr.ac.cn.(2015).Double resonance Raman modes in monolayer and few-layer MoTe2.PHYSICAL REVIEW B,91(20),-.
MLA	Guo, Huaihong,et al."Double resonance Raman modes in monolayer and few-layer MoTe2".PHYSICAL REVIEW B 91.20(2015):-.