Gigantic photoresponse in 1/4-filled-band organic salt (EDO-TTF)2PF6
Gigantic photoresponse in 1/4-filled-band organic salt (EDO-TTF)2PF6
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DOI：
10.1126/science.1105067
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发表时间：
2005-01-07
期刊：
影响因子：
56.9
通讯作者：
Koshihara, S
中科院分区：
文献类型：
--
作者：
Chollet, M;Guerin, L;Koshihara, S
我们报道了有机盐(EDO-TTF)(2)PF6具有3/4填充带(1/4填充空穴)，它形成了一种具有强电子和晶格关联的有机金属，对光激发表现出高度敏感的响应。在近室温下，用很弱的激发强度就能诱导出从绝缘体相到金属相的超快光致相变。这种响应使该材料在室温操作的开关器件中的应用具有吸引力。观察到的光致光谱变化表明，这种光致相变过程是由电荷有序的协同熔化以及相干声子的产生引起的。
We report that the organic salt (EDO-TTF)(2)PF6 with 3/4-filled-band (1/4-filled in terms of holes), which forms an organic metal with strong electron and lattice correlation, shows a highly sensitive response to photoexcitation. An ultrafast, photoinduced phase transition from the insulator phase to the metal phase can be induced with very weak excitation intensity at near room temperature. This response makes the material attractive for applications in switching devices with room-temperature operation. The observed photoinduced spectroscopic change shows that this photoinduced phase transition process is caused by the cooperative melting of charge ordering assisted by coherent phonon generation.