Dynamical Slowing-Down in an Ultrafast Photoinduced Phase Transition

被引：62

作者：

Zong, Alfred ^{[1
]}

Dolgirev, Pavel E. ^{[2
,3
]}

Kogar, Anshul ^{[1
]}

Ergecen, Emre ^{[1
]}

Yilmaz, Mehmet B. ^{[1
]}

Bie, Ya-Qing ^{[1
,11
]}

Rohwer, Timm ^{[1
]}

Tung, I-Cheng ^{[4
]}

Straquadine, Joshua ^{[5
,6
,7
]}

Wang, Xirui ^{[1
]}

Yang, Yafang ^{[1
]}

Shen, Xiaozhe ^{[8
]}

Li, Renkai ^{[8
]}

Yang, Jie ^{[8
]}

Park, Suji ^{[8
,9
]}

Hoffmann, Matthias C. ^{[10
]}

Ofori-Okai, Benjamin K. ^{[8
]}

Kozina, Michael E. ^{[8
]}

Wen, Haidan ^{[4
]}

Wang, Xijie ^{[8
]}

Fisher, Ian R. ^{[5
,6
,7
]}

Jarillo-Herrero, Pablo ^{[1
]}

Gedik, Nuh ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Skolkovo Innovat Ctr, Skolkovo Inst Sci & Technol, 3 Nobel St, Moscow 143026, Russia

[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[5] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[6] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[7] SLAC Natl Accelerator Lab, SIMES, Menlo Pk, CA 94025 USA

[8] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[9] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[10] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Stanford, CA 94025 USA

[11] Sun Yat Sen Univ, Sch Elect & Informat Technol, Guangzhou 510006, Guangdong, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 09期

关键词：

CHARGE-DENSITY-WAVE; REAL-TIME; ORDER; PARTICLE;

D O I：

10.1103/PhysRevLett.123.097601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Complex systems, which consist of a large number of interacting constituents, often exhibit universal behavior near a phase transition. A slowdown of certain dynamical observables is one such recurring feature found in a vast array of contexts. This phenomenon, known as critical slowing-down, is well studied mostly in thermodynamic phase transitions. However, it is less understood in highly nonequilibrium settings, where the time it takes to traverse the phase boundary becomes comparable to the timescale of dynamical fluctuations. Using transient optical spectroscopy and femtosecond electron diffraction, we studied a photoinduced transition of a model charge-density-wave (CDW) compound LaTe3. We observed that it takes the longest time to suppress the order parameter at the threshold photoexcitation density, where the CDW transiently vanishes. This finding can be captured by generalizing the time-dependent Landau theory to a system far from equilibrium. The experimental observation and theoretical understanding of dynamical slowing-down may offer insight into other general principles behind nonequilibrium phase transitions in many-body systems.

引用

页数：7

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