Electric-field-induced Mott transition in an organic molecular crystal
Electric-field-induced Mott transition in an organic molecular crystal
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DOI：
10.1103/physrevb.84.125129
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发表时间：
2011-09-16
影响因子：
3.7
通讯作者：
Kato, Reizo
中科院分区：
文献类型：
--
作者：
Kawasugi, Yoshitaka;Yamamoto, Hiroshi M.;Kato, Reizo
研究了场效应对有机超导体kappa-(BEDT-TTf)(2)Cu[N(CN)(2)]Br应变诱导Mott绝缘态的影响。研究了栅极电压与电导率、霍尔系数和热电势的关系。当电导率服从激活型绝缘公式时，霍尔系数和热电势在高栅电压下呈现出向类金属带状结构的连续转变。这表明在有限的静电掺杂下Hubbard带的合并，即场诱导的Mott相变。
We study the field effect on the strain-induced Mott-insulating state of an organic superconductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br. The gate voltage dependences of the conductivity, Hall coefficient, and thermopower were investigated. While the conductivity obeyed an activation-type insulating formula, the Hall coefficient and thermopower exhibited continuous transition to a metal-like band structure under high gate voltage. This indicates the merger of Hubbard bands at finite electrostatic doping; that is, the field-induced Mott transition.