利用一维原子链模型研究薄膜瞬态结构变化

郭鑫; 李明华; 李毅飞; 陶梦泽; 王进光; 李大章; 辛建国; 陈黎明

doi:10.7498/aps.66.186202

摘要

对于晶格结构响应的仿真与实验有助于我们理解激光激发引起的动态过程.利用一维原子链模型研究了激光加热后由于温度分布不均匀性产生的热应力对晶格的影响，该模型的计算结果与使用超快X射线衍射获得的实验结果相符合.该模型为研究光激发金属以及半导体等材料的超快晶格动力学提供了理论分析基础.

关键词:

Functional materials have received much attention in the development of scientific technology. Macroscopic function of material is usually linked to the microscopic properties. In order to understand the relationship between structure and function, it is necessary to observe transient structural change of material in real time. In the earlier experimental work femtosecond optical probes were used to measure associated modulation in optical properties like transmissivity or reflectivity and extract the information about structural dynamics through sophisticated theoretical modeling. Since the development of laser-based ultrafast X-ray sources, there has been extensive work on femtosecond X-ray diffraction measurements. The coupling of sensitive X-ray with time-resolved pump-probe technique provides a way to directly monitor the time-dependent lattice structural changes in condensed matter. Recent researches are devoted to the study of non-thermal melting and coherent acoustic photons. The classical continuous elastic equation can only provide a limited view of structural dynamics. So, simulation of structural dynamics at an atomic level and comparison of such simulation with time-resolved X-ray diffraction data are necessary.#br#In this paper, we use the one-dimensional chain model to study the effect of thermal stress on the lattice due to the inhomogeneity of temperature distribution after ultrafast laser heating. It is developed from the classic continuous elastic equation by considering a nanometer film as a chain of point mass connected by springs. The simulation can directly reveal the positon of each point mass (atom) as a function of time for a given temperature (stress) profile. The simulation results accord very well with experimental data obtained with femtosecond X-ray diffraction. Compared with simulation results, the ultrafast X-ray diffraction experimental results are not enough to distinguish the compression near the zero time, but the characteristic time (~123 ps) and broadening of the diffraction peak are clearly observed. The simulation and experimental study of the lattice structural response are of great help for understanding the direct relationship between the lattice responses caused by ultrafast laser excitation, the generation and propagation of strain, one-dimensional chain model has important applications in studying the recoverable ultrafast lattice dynamics of metals, semiconductors and other materials.

Keywords:

作者及机构信息

1.
北京理工大学光电学院, 北京 100081;

2.
中国科学院物理研究所, 北京 100080;

3.
上海交通大学IFSA协同创新中心, 上海 200240;

4.
中国科学院高能物理研究所, 北京 100049

通信作者: 陈黎明, lmchen@iphy.ac.cn

基金项目: 国家自然科学基金（批准号：11334013，11421064，11374210）资助的课题.

Authors and contacts

1.
School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;

2.
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;

3.
IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China;

4.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Chen Li-Ming, lmchen@iphy.ac.cn

Funds: Project supported by the National Nature Science Foundation of China (Grant Nos. 11334013, 11421064, 11374210).

参考文献

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施引文献

[1]	Mourou G A, Tajima T, Bulanov S V 2006 Rev. Mod. Phys. 78 309
[2]	Sheng Z M, Mima K, Zhang J, Sanuki H 2005 Phys. Rev. Lett. 94 095003
[3]	Chen L M, Wang W M, Kando M, Hudson L T, Liu F, Lin X X, Ma J L, Li Y T, Bulanov S V, Tajima T, Kato Y, Sheng Z M, Zhang J 2010 Nucl. Instru. Meth. Phys. Res. Sect. A 619 128
[4]	Rousse A, Phuoc K T, Shah R, Pukhov A, Lefebvre E, Malka V, Kiselev S, Burgy F, Rousseau J P, Umstadter D, Hulin D 2004 Phys. Rev. Lett. 93 135005
[5]	Chen L M, Liu F, Wang W M, Kando M, Mao J Y, Zhang L, Ma J L, Li Y T, Bulanov S V, Tajima T, Kato Y, Sheng Z M, Wei Z Y, Zhang J 2010 Phys. Rev. Lett. 104 215004
[6]	Chen X C, Zhou J P, Wang H Y, Xu P S, Pan G Q 2011 Chin. Phys. B 20 096102
[7]	Sokolowski T K, Blome C, Dietrich C, Tarasevitch A, Hornvon H M, Vonder L D, Cavalleri A, Squier J, Kammler M 2001 Phys. Rev. Lett. 87 225701
[8]	Rousse A, Rischel C, Fourmaux S, Uschmann I, Sebban S, Grillon G, Balcou P, Förster E, Geindre J P, Audebert P 2001 Nature 410 65
[9]	Schick D, Bojahr A, Herzog M, Schmising C V K, Shayduk R, Leitenberger W, Gaal P, Bargheer M 2012 Rev. Sci. Instrum. 83 025104
[10]	Sokolowski T K, Blome C, Blums J, Cavalleri A, Dietrich C, Tarasevitch A, Uschmann I, Förster E, Kammler M, Hornvon H M 2003 Nature 422 287
[11]	Chen J, Tomov I, Elsayed A, Rentzepis P 2006 Chem. Phys. Lett. 419 374
[12]	Chen L M, Kando M, Xu M, Li Y, Koga J, Chen M, Xu H, Yuan X, Dong Q, Sheng Z M 2008 Phys. Rev. Lett. 100 045004
[13]	Reich C, Uschmann I, Ewald F, Dusterer S, Lubcke A, Schwoerer H, Sauerbrey R, Forster E, Gibbon P 2003 Phys. Rev. E 68 056408
[14]	Tao Z S, Han T T, Subhendra D M, Phillip M D, Yuan F, Ruan C Y, Kevin W, Wu J Q 2012 Phys. Rev. Lett. 109 166406
[15]	Liang W X, Giovanni M V, Ahmed H Z 2014 Proc. Natl. Acad. Sci. USA 111 5491
[16]	Huang K, Li M H, Yan W C, Guo X, Li D Z, Chen Y P, Ma Y, Zhao J R, Li Y F, Chen L M, Zhang J 2014 Rev. Sci. Instrum. 85 113304
[17]	Huang K, Yan W C, Li M H, Tao M Z, Chen Y P, Chen J, Yuan X H, Zhao J R, Ma Y, Li D Z, Gao J, Chen L M, Zhang J 2013 Acta. Phys. Sin. 62 205204(in Chinese)[黄开, 闫文超, 李明华, 陶孟泽, 陈燕萍, 陈洁, 远晓辉, 赵家瑞, 马勇, 李大章, 高杰, 陈黎明, 张杰2013 62 205204]
[18]	Hohlfeld J, Wellershoff S S, Gdde J, Conrad U, Jähnke V, Matthias E 2000 Chem. Phys. 251 237
[19]	Anisimov S I, Kapeliovich B L, Perelman T L 1974 J. Exp. Theor. Phys. 66 776
[20]	Bargheer M, Zhavoronkov N, Gritsai Y, Woo J C, Kim D S, Woerner M, Elsaesser T 2004 Science 306 1771

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