Bechgaard-Fabre盐中的退禁闭转变和维度交叉：压力和温度相关的光学研究
Deconfinement transition and dimensional crossover in the Bechgaard-Fabre salts: pressure- and temperature-dependent optical investigations
摘要：
研究了有机导体（TMTSF）$_2$ PF $_6$和莫特绝缘体（TMTTF）$_2$ PF $_6$的红外响应随温度和压力的变化以及偏振方向与分子叠层平行和垂直的情况。通过在（TMTTF）$_2$ PF $_6$上施加外部压力，Mott能隙迅速减小，直到当能隙能量约为链间转移积分的两倍时发生解禁闭转变。在其去精细状态（TMTTF）下，$_2$ PF $_6$在降低温度时表现出从准一维到高维金属的交叉。对于（TMTSF）$_2$ PF $_6$，随着外部压力的增加或温度的降低，观察到这种尺寸交叉。我们定量地确定在压力-温度图的基础上，在垂直于分子堆叠的光学响应的相干程度的尺寸交叉线。
英文摘要：
The infrared response of the organic conductor (TMTSF)$_2$PF$_6$ and the Mott insulator (TMTTF)$_2$PF$_6$ are investigated as a function of temperature and pressure and for the polarization parallel and perpendicular to the molecular stacks. By applying external pressure on (TMTTF)$_2$PF$_6$, the Mott gap rapidly diminishes until the deconfinement transition occurs when the gap energy is approximately twice the interchain transfer integral. In its deconfined state (TMTTF)$_2$PF$_6$ exhibits a crossover from a quasi-one-dimensional to a higher-dimensional metal upon reducing the temperature. For (TMTSF)$_2$PF$_6$ this dimensional crossover is observed either with increase in external pressure or with decrease in temperature. We quantitatively determine the dimensional crossover line in the pressure-temperature diagram based on the degree of coherence in the optical response perpendicular to the molecular stacks.
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