Effects of hot phonons and thermal stress in micro-Raman spectra of molybdenum disulfide

拉曼光谱 声子 布里渊区 材料科学 二硫化钼 激光器 凝聚态物理 放松(心理学) 分子物理学 光学 化学 复合材料 物理 心理学 社会心理学
作者
Peter Sokalski,Zherui Han,Gabriella Coloyan Fleming,B.A. Smith,Sean E. Sullivan,Rui Huang,Xiulin Ruan,Li Shi
出处
期刊:Applied Physics Letters [American Institute of Physics]
卷期号:121 (18) 被引量:5
标识
DOI:10.1063/5.0122945
摘要

Micro-Raman spectroscopy has become an important tool in probing thermophysical properties in functional materials. Localized heating by the focused Raman excitation laser beam can produce both stress and local nonequilibrium phonons in the material. Here, we investigate the effects of hot optical phonons in the Raman spectra of molybdenum disulfide and distinguish them from those caused by thermally induced compressive stress, which causes a Raman frequency blue shift. We use a thermomechanical analysis to correct for this stress effect in the equivalent lattice temperature extracted from the measured Raman peak shift. When the heating Gaussian laser beam is reduced to 0.71 μm, the corrected peak shift temperature rise is 17% and 8%, respectively, higher than those determined from the measured peak shift and linewidth without the stress correction, and 32% smaller than the optical phonon temperature rise obtained from the anti-Stokes to Stokes intensity ratio. This nonequilibrium between the hot optical phonons and the lattice vanishes as the beam width increases to 1.53 μm. Much less pronounced than those reported in prior micro-Raman measurements of suspended graphene, this observed hot phonon behavior agrees with a first-principles based multitemperature model of overpopulated zone-center optical phonons compared to other optical phonons in the Brillouin zone and acoustic phonons of this prototypical transition metal dichalcogenide. The findings provide detailed insight into the energy relaxation processes in this emerging electronic and optoelectronic material and clarify an important question in micro-Raman measurements of thermal transport in this and other two-dimensional materials.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
3秒前
落后乘风完成签到 ,获得积分10
3秒前
3秒前
阿巴阿巴应助louis136116采纳,获得10
4秒前
5秒前
5秒前
hh10ve完成签到,获得积分10
7秒前
Echo发布了新的文献求助10
7秒前
搁浅发布了新的文献求助10
8秒前
8秒前
量子星尘发布了新的文献求助10
9秒前
mk完成签到 ,获得积分10
10秒前
12秒前
粉条完成签到,获得积分20
13秒前
YOLO完成签到,获得积分10
14秒前
桐桐应助林新煌采纳,获得10
14秒前
徐志成完成签到 ,获得积分10
14秒前
123完成签到,获得积分10
14秒前
huohuo发布了新的文献求助10
14秒前
粉条发布了新的文献求助10
16秒前
123发布了新的文献求助10
17秒前
闪落完成签到,获得积分20
21秒前
InaZheng发布了新的文献求助10
21秒前
荣荣完成签到,获得积分10
22秒前
fan完成签到,获得积分10
22秒前
慕青应助wyz采纳,获得10
24秒前
24秒前
24秒前
可靠觅珍应助蜡笔小新采纳,获得60
25秒前
26秒前
可爱的函函应助fan采纳,获得10
26秒前
YOLO发布了新的文献求助10
28秒前
Anna发布了新的文献求助10
29秒前
研友_Z33zkZ发布了新的文献求助10
30秒前
李健的小迷弟应助毛毛采纳,获得10
31秒前
核桃发布了新的文献求助30
31秒前
Connor完成签到,获得积分10
31秒前
研友_VZG7GZ应助研友_Z33zkZ采纳,获得10
36秒前
小二郎应助体贴向日葵采纳,获得10
37秒前
38秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3975378
求助须知:如何正确求助?哪些是违规求助? 3519775
关于积分的说明 11199621
捐赠科研通 3256067
什么是DOI,文献DOI怎么找? 1798124
邀请新用户注册赠送积分活动 877386
科研通“疑难数据库(出版商)”最低求助积分说明 806305