Dynamic conductivity scaling in photoexcited V2O3 thin films

被引:41
作者
Abreu, Elsa [1 ]
Wang, Siming [2 ,3 ,4 ]
Ramirez, Juan Gabriel [2 ,3 ]
Liu, Mengkun [2 ,5 ]
Zhang, Jingdi [1 ,2 ]
Geng, Kun [1 ]
Schuller, Ivan K. [2 ,3 ,4 ]
Averitt, Richard D. [1 ,2 ]
机构
[1] Boston Univ, Dept Phys, Boston, MA 02215 USA
[2] Univ Calif San Diego, Phys Dept, La Jolla, CA 92093 USA
[3] Univ Calif San Diego, Ctr Adv Nanosci, La Jolla, CA 92093 USA
[4] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA
[5] SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA
关键词
MOTT TRANSITION; METAL; RELAXATION; ELECTRONS; STATES; HEAT; PURE; TIME;
D O I
10.1103/PhysRevB.92.085130
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Optical-pump terahertz-probe spectroscopy is used to investigate ultrafast far-infrared conductivity dynamics during the insulator-to-metal transition in vanadium sesquioxide (V2O3). The resultant conductivity increase occurs on a tens of picosecond time scale, exhibiting a strong dependence on the initial temperature and fluence. We have identified a scaling of the conductivity dynamics upon renormalizing the time axis with a simple power law (alpha similar or equal to 1/2) that depends solely on the initial, final, and conductivity onset temperatures. Qualitative and quantitative considerations indicate that the dynamics arise from nucleation and growth of the metallic phase which can be described by the Avrami model. We show that the temporal scaling arises from spatial scaling of the growth of the metallic volume fraction, highlighting the self-similar nature of the dynamics. Our results illustrate the important role played by mesoscopic effects in phase transition dynamics.
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页数:6
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