Modeling of Evolution of a Complex Electronic System to an Ordered Hidden State: Application to Optical Quench in 1T-TaS2

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• 作者：S. Brazovskii (1) (2) (3)
  
  1. LPTMS-CNRS ; UMR8626 ; Univ. Paris-Sud ; Bat. 100 ; Orsay ; 91405 ; France
  2. Department of Complex Matter ; Jozef Stefan Institute ; Jamova 39 ; SI-1000 ; Ljubljana ; Slovenia
  3. International Institute of Physics ; 59078-400 Natal ; Rio Grande do Norte ; Brazil
  
• 关键词：Femtosecond optics ; PIPT ; Hidden phase ; Mott insulator ; Polaron ; CDW ; Wigner crystal
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：28
• 期：4
• 页码：1349-1353
• 全文大小：1,744 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

Femtosecond techniques addressing phase transitions induced by optical pumps have allowed recently to put an ambitious goal to attend hidden states which are inaccessible and even unknown under equilibrium conditions. Recently, the group from Slovenia led by D. Mihailovic achieved a bistable switching to a hidden electronic state in 1T-TaS2. The state is stable until an erase procedure reverts it to the thermodynamic ground state. A notoriously intricate nature of this material requires to consider simultaneous evolution of electrons and holes as mobile charge carriers, and crystallized electrons modifiable by intrinsic defects (voids and interstitials); all that on the CDW background. Our model considers mutual transformations among the three reservoirs of electrons, together with the heat production, which are dictated by imbalances of three partial chemical potentials. The phenomenological approach sheds a light on a very complicated and not yet resolved physics of this material which includes interplaying effects like CDW, Wigner crystal, commensurability, polarons, and Mott state.