Buzzi M, Nicoletti D, Fava S, Jotzu G, Miyagawa K, Kanoda K, Henderson A, Siegrist T, Schlueter J A, Nam M-S, Ardavan A, Cavalleri A
Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany.
Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Phys Rev Lett. 2021 Nov 5;127(19):197002. doi: 10.1103/PhysRevLett.127.197002.
Resonant optical excitation of certain molecular vibrations in κ-(BEDT-TTF){2}Cu[N(CN){2}]Br has been shown to induce transient superconductinglike optical properties at temperatures far above equilibrium T_{c}. Here, we report experiments across the bandwidth-tuned phase diagram of this class of materials, and study the Mott insulator κ-(BEDT-TTF){2}Cu[N(CN){2}]Cl and the metallic compound κ-(BEDT-TTF){2}Cu(NCS){2}. We find nonequilibrium photoinduced superconductivity only in κ-(BEDT-TTF){2}Cu[N(CN){2}]Br, indicating that the proximity to the Mott insulating phase and possibly the presence of preexisting superconducting fluctuations are prerequisites for this effect.
已证明，在远高于平衡态临界温度(T_{c})的温度下，对κ-(BEDT-TTF)₂Cu[N(CN)₂]Br中某些分子振动进行共振光激发，会诱导出类似超导的瞬态光学性质。在此，我们报告了针对这类材料在带宽调谐相图上进行的实验，并研究了莫特绝缘体κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl和金属化合物κ-(BEDT-TTF)₂Cu(NCS)₂。我们发现，只有在κ-(BEDT-TTF)₂Cu[N(CN)₂]Br中存在非平衡光致超导现象，这表明接近莫特绝缘相以及可能存在预先存在的超导涨落是产生这种效应的先决条件。
