钾插层并五苯中Mott态形成的证据
Evidence for the formation of a Mott state in potassium-intercalated pentacene
摘要：
研究了并五苯薄膜中钾离子的电子输运性质。从温度依赖性的电导率测量，我们发现，钾插层并五苯显示在很宽的钾浓度范围内的金属行为。令人惊讶的是，当钾浓度增加到超过每个分子一个原子时，电导率表现出重新进入绝缘状态。我们通过电子结构计算从理论上分析了我们的观察结果，我们得出结论，这种现象源于莫特金属-绝缘体转变，由电子-电子相互作用驱动。
英文摘要：
We investigate electronic transport through pentacene thin-films intercalated with potassium. From temperature-dependent conductivity measurements we find that potassium-intercalated pentacene shows metallic behavior in a broad range of potassium concentrations. Surprisingly, the conductivity exhibits a re-entrance into an insulating state when the potassium concentration is increased past one atom per molecule. We analyze our observations theoretically by means of electronic structure calculations, and we conclude that the phenomenon originates from a Mott metal-insulator transition, driven by electron-electron interactions.
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