Time-resolved ultrafast dynamics in triple degenerate topological semimetal molybdenum phosphide

Jiang Cong-Ying; Sun Fei; Feng Zi-Li; Liu Shi-Bing; Shi You-Guo; Zhao Ji-Min

doi:10.7498/aps.69.20191816

Abstract

We employ the time resolved pump probe experiment to investigate the ultrafast dynamics in a topological semimetal molybdenum phosphide (MoP), which exhibits triple degenerate points in the momentum space. Two relaxation processes with the lifetime of 0.3 and 150 ps have been observed. We attribute the fast component to the electron-phonon scattering and the slow component to the phonon-phonon scattering, respectively. Temperature dependence investigation shows that both the lifetimes of the fast and slow components enhance slightly with increasing temperature. We also successfully generate and detect a thermal-stress-induced coherent acoustic phonon mode with a frequency of 0.033 THz, which does not vary with temperature. Our ultrafast spectroscopy investigation of the quasiparticle dynamics and the coherent phonon in MoP provides useful experimental facts and information about the overall excited state dynamics and the temperature dependence of electron-phonon coupling.

Keywords:

Authors and contacts

1.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2.
School of Physical sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Strong-Field and Ultrafast Photonics Lab, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
4.
Songshan Lake Materials Laboratory, Dongguan 523808, China

Corresponding author: Zhao Ji-Min, jmzhao@iphy.ac.cn

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References

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Cited By

图 1 MoP的时间分辨超快动力学过程　(a) 温度从7 K到290 K变化的∆R/R₀曲线; (b)进行泵浦探测实验所用MoP样品的SEM图片; (c)和(d)分别为MoP样品在不同角度下的晶格结构. 蓝色和红色小球分别代表Mo原子和P原子

Figure 1. Time-resolved pump-probe spectroscopy showing the ultrafast dynamics of MoP: (a) The ∆R/R₀ of MoP at several typical temperatures from 7 to 290 K; (b) SEM image of our sample; (c) and (d) Schematic lattice structures of MoP. Blue and red balls: Mo and P atoms, respectively.

DownLoad: Full-Size Img PowerPoint

图 2 温度依赖的动力学二维彩图

Figure 2. 2D mapping diagram of temperature-dependent dynamics.

DownLoad: Full-Size Img PowerPoint

图 3 温度为7 K的∆R/R₀的拟合结果, 其中空心圆圈代表原始实验数据, 蓝色实线代表拟合曲线. 插图为激发的相干态声学支声子的频率对温度的依赖, 在整个温区均为0.033 THz

Figure 3. Fitting of the ∆R/R₀ at 7 K, where the black circles represent the raw data and the blue curve represents the fitting result, respectively. The inset illustrates the temperature dependence of the frequency of the coherent acoustic phonon, which stays 0.033 THz for the whole temperature range.

DownLoad: Full-Size Img PowerPoint

图 4 光激发载流子的弛豫过程对温度的依赖　(a)A_fast, (b)τ_fast, (c)A_fast和(d)τ_slow分别表示快分量和慢分量的幅值和寿命随温度的变化.红色和蓝色分别代表快分量和慢分量

Figure 4. Temperature dependence of the amplitudes and lifetimes: (a)A_fast, (b)τ_fast, (c)A_fast和(d)τ_slow. The red and blue linesdenote the fast and slow components, respectively.

DownLoad: Full-Size Img PowerPoint

map

[1]	Armitage N P, Mele E J, Vishwanath A 2018 Rev. Mod. Phys. 90 015001 Google Scholar
[2]	Wang Z J, Weng H M, Wu Q S, Dai X, Fang Z 2013 Phys. Rev. B 88 125427 Google Scholar
[3]	Liu Z K, Jiang J, Zhou B, Wang Z J, Zhang Y, Weng H M, Prabhakaran D, Mo S K, Peng H, Dudin P, Kim T, Hoesch M, Fang Z, Dai X, Shen Z X, Feng D L, Hussain Z, Chen Y L 2014 Nat. Mater. 13 677 Google Scholar
[4]	Wan X G, Turner A M, Vishwanath A, Savrasov S Y 2011 Phys. Rev. B 83 205101 Google Scholar
[5]	Huang X C, Zhao L X, Long Y J, Wang P P, Chen D, Yang Z H, Liang H, Xue M Q, Weng H M, Fang Z, Dai X, Chen G F 2015 Phys. Rev. X 5 031023
[6]	Bradlyn B, Cano J, Wang Z J, Vergniory M G, Felser C, Cava R J, Bernevig B A 2016 Science 353 6299 Google Scholar
[7]	Lv B Q, Feng Z L, Xu Q N, Gao X, Ma J Z, Kong L Y, Richard P, Huang Y B, Strocov V N, Fang C, Weng H M, Shi Y G, Qian T, Ding H 2017 Nature 546 627 Google Scholar
[8]	Chi Z H, Chen X L, An C, Yang L X, Zhao J G, Feng Zili, Zhou Y H, Zhou Y, Gu C C, Zhang B W, Yuan Y F, Curtis K B, Yang W G, Wu G, Wan X G, Shi Y G, Yang X P, Yang Z R 2018 npj. Quantum. Materials 3 28 Google Scholar
[9]	Zhu Z M, Winkler G W, Wu Q S, Li J, Soluyanov A A 2016 Phys. Rev. X 6 031003
[10]	Tian Y C, Zhang W H, Li F S, Wu Y L, Wu Q, Sun F, Zhou G Y, Wang L L, Ma X C, Xue Q K, Zhao J M 2016 Phys. Rev. Lett. 116 107001 Google Scholar
[11]	Wu Q, Zhou H X, Wu Y L, Hu L L, Ni S L, Tian Y C, Sun F, Zhou F, Dong X L, Zhao Z X, Zhao J M 2019 arXiv 1910 09859
[12]	Toda Y, Kawanokami F, Kurosawa T, Oda M, Madan I, Mertelj T, Kabanov V V, Mihailovic D 2014 Phys. Rev. B 90 094513 Google Scholar
[13]	曹宁, 龙拥兵, 张治国, 高丽娟, 袁洁, 赵伯儒, 赵士平, 杨乾生, 赵继民, 傅盘铭 2008 57 2543 Google Scholar Cao N, Long Y B, Zang Z G, Gao L J, Yuan J, Zhao B R, Zhao S P, Yang Q S, Zhao J M, Fu P M 2008 Acta Phys. Sin. 57 2543 Google Scholar
[14]	Cao N, Wei Y F, Zhao J M, Zhao S P, Yang Q S, Zhang Z G, Fu P M 2008 Chin. Phys. Lett. 25 2257 Google Scholar
[15]	Sun F, Yang M, Yang M W, Wu Q, Zhao H, Ye X, Shi Y G, Zhao J M 2018 Chin. Phys. Lett. 35 116301 Google Scholar
[16]	Sun F, Wu Q, Wu Y L, Zhao H, Yi C J, Tian Y C, Liu H W, Shi Y G, Ding H, Dai X, Richard P, Zhao J M 2017 Phys. Rev. B 95 235108 Google Scholar
[17]	Wang M C, Qiao S, Jiang Z, Luo S N, Qi J 2016 Phys. Rev. Lett. 116 036601 Google Scholar
[18]	Hu L L, Yang M, Wu Y L, Wu Q, Zhao H, Sun F, Wang W, He R, He S L, Zhang H, Huang R J, Li L F, Shi Y G, Zhao J M 2019 Phys. Rev. B 99 094307 Google Scholar
[19]	Hsieh D, Mahmood F, Torchinsky D H, Cao G, Gedik N 2012 Phys. Rev. B 86 035128 Google Scholar
[20]	SieE J, MclverJ, Lee Y H, Fu L, Kong J, Gedik N 2015 Nat. Mater. 14 290 Google Scholar
[21]	Ge S F, Liu X F, Qiao X A, Wang Q S, Xu Z, Qiu J, Tan P H, Zhao J M, Sun D 2015 Sci. Rep. 4 5722
[22]	Wang R, Wang T, Zhou Y, Wu Y L, Zhang X X, He X Y, Peng H L, Zhao J M, Qiu X H 2019 2D Mater. 6 035034
[23]	Wang Y J, Chen H L, Sun M T, Yao Z G, Quan B G, Liu Z, Weng Y X, Zhao J M, Gu C Z, Li J J 2017 Carbon 122 98 Google Scholar
[24]	Zhao J M, Bragas A V, Lockwood D J, Merlin R 2004 Phys. Rev. Lett. 93 107203 Google Scholar
[25]	Zhao J M, Bragas A V, Merlin R, Lockwood D J 2006 Phys. Rev. B 73 184434 Google Scholar
[26]	Aku-Leh C, Zhao J M, Merlin R, Menéndez J, Cardona M 2005 Phys. Rev. B 71 205211 Google Scholar
[27]	Bragas A V, Aku-Leh C, Costantino S, Ingale A, Zhao J M, Merlin R 2004 Phys. Rev. B 69 205306 Google Scholar

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Vol. 69, Issue 7 - 2020-04-05

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