Electrically induced phase transition in α -(BEDT-TTF) 2 I 3 : Indications for Dirac-like hot charge carriers
Electrically induced phase transition in α -(BEDT-TTF) 2 I 3 : Indications for Dirac-like hot charge carriers
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α -(BEDT-TTF) 2 I 3 中的电致相变：类狄拉克热载流子的适应症
DOI：
10.1103/physrevb.93.245133
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发表时间：
2016
影响因子：
3.7
通讯作者：
M. Dressel
中科院分区：
文献类型：
--
作者：
T. Peterseim;T. Ivek;D. Schweitzer;M. Dressel
由于电荷有序化，二维有机导体发生了金属-绝缘体转变。我们已经进行了时间分辨的调查，其电子性质，以探索场和温度依赖的动力学。在一定的阈值电场下，系统从低导通状态切换到高导通状态，并伴随着负微分电阻。我们的随时间变化的红外研究表明，接近，强电场推动晶体进入金属状态，光学性质类似于。然而，在绝缘状态下，光谱响应证明了一个完全不同的电子诱导高导电状态。应用热电子的两态模型解释了具有高迁移率的电荷载流子的激发的观察。它们类似于在高压下发现的具有线性色散电子带的Dirac类电荷载流子。大量的数值模拟定量再现了我们的实验结果的所有细节。
The two-dimensional organic conductorundergoes a metal-insulator transition atdue to electronic charge ordering. We have conducted time-resolved investigations of its electronic properties in order to explore the field- and temperature-dependent dynamics. At a certain threshold field, the system switches from a low-conducting to a high-conducting state, accompanied by a negative differential resistance. Our time-dependent infrared investigations indicate that close to, the strong electric field pushes the crystal into a metallic state with optical properties similar to the one for. Well into the insulating state, however, at, the spectral response evidences a completely different electronically induced high-conducting state. Applying a two-state model of hot electrons explains the observations by excitation of charge carriers with a high mobility. They resemble the Dirac-like charge carriers with a linear dispersion of the electronic bands found inat high pressure. Extensive numerical simulations quantitatively reproduce our experimental findings in all details.