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Ab initio investigation of photoinduced non-thermal phase transition in β -cristobalite |
Shi-Quan Feng(冯世全)1, Hua-Ping Zang(臧华平)2, Yong-Qiang Wang(王永强)1, Xin-Lu Cheng(程新路)3, Jin-Sheng Yue(岳金胜)4 |
1. The High Pressure Research Center of Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, China; 2. School of Physics and Engineering, Zhengzhou University, Zhengzhou 450002, China; 3. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; 4. Luoyang Sunrui Sprcial Equipment CO., LTD, Luoyang 471003, China |
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Abstract Using the linear-response method, we investigate the phonon properties of β -cristobalite crystal under electronic excitation effect. We find that the transverse-acoustic phonon frequency becomes imaginary as the electron temperature is increased, which means that the lattice of β -cristobalite becomes unstable under intense laser irradiation. In addition, for the optic phonon mode, the LO(H)-TO(H) splitting disappears when the electronic temperature reaches a certain value, corresponding to the whole transverse-acoustic phonon branches becoming negative. It means that the electronic excitation destroys the macroscopic electric field of β -cristobalite. Based on the calculated phonon band structures, some thermodynamic properties are calculated as a function of temperature at different electronic temperatures. These investigations provide evidence that non-thermal melting takes place during a femtosecond pulse laser interaction with β -cristobalite.
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Received: 24 July 2015
Revised: 18 September 2015
Accepted manuscript online:
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PACS:
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67.25.bd
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(Thermodynamic properties)
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63.20.dk
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(First-principles theory)
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05.70.Ce
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(Thermodynamic functions and equations of state)
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Fund: Project support by the National Natural Science Foundation of China (Grant Nos. 11374217 and 11547158). |
Corresponding Authors:
Shi-Quan Feng
E-mail: fengsq2013@126.com
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Cite this article:
Shi-Quan Feng(冯世全), Hua-Ping Zang(臧华平), Yong-Qiang Wang(王永强), Xin-Lu Cheng(程新路), Jin-Sheng Yue(岳金胜) Ab initio investigation of photoinduced non-thermal phase transition in β -cristobalite 2016 Chin. Phys. B 25 016701
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