Photoinduced phase transitions in two-dimensional charge-density-wave 1T-TaS2

• 来源期刊: 中国物理B（英文版）
• 关键词: charge density wave phase transition 1T-TaS2 photodetection
• 年，卷（期）: 2019,（5）
• 页码范围: 1-11
• 页数: 11页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/5/058504

摘要

Charge-density-wave (CDW) materials with strongly correlated electrons have broadband light absorption and ultra-fast response to light irradiation, and hence hold great potential in photodetection. 1T-TaS2 is a typical CDW material with various thermodynamically CDW ground states at different temperatures and fertile out-of-equilibrium intermedi-ate/hidden states. In particular, the light pulses can trigger melting of CDW ordering and also forms hidden states, which exhibits strikingly different electrical conductivity compared to the ground phase. Here, we review the recent research on phase transitions in 1T-TaS2 and their potential applications in photodetection. We also discuss the ultrafast melting of CDW ordering by ultrafast laser irradiation and the out-of-equilibrium intermediate/hidden states by optical/electrical pulse. For photodetection, demonstrations of photoconductors and bolometers are introduced. Finally, we discuss some of the challenges that remain.