$κ$ -(ET)$_2$ Cu $_2$(CN)$_3$模型参数的第一性原理确定
First principles determination of the model parameters in $κ$-(ET)$_2$Cu$_2$(CN)$_3$
摘要:
我们在{ \it ab initio}密度泛函理论的框架下,详细研究了$κ$ -(ET)$_2$ Cu $_2$(CN)$_3$的Hubbard模型参数的推导.我们表明,不同的计算(i)波函数的基础上,(ii)交换相关泛函和(iii)紧束缚模型提供了一个可靠的基准参数值。我们比较了我们的结果与现有的扩展Hückel分子轨道计算,并讨论了它的影响的性质的描述$κ$ -(ET)$_2$铜$_2$(CN)$_3$。对$κ$ -(ET)$_2$ Cu(SCN)$_2$的电子性质也作了简要的讨论。
英文摘要:
We present a detailed study of the derivation of the Hubbard model parameters for $κ$-(ET)$_2$Cu$_2$(CN)$_3$ in the framework of {\it ab initio} Density Functional Theory. We show that calculations with different (i) wavefunction basis, (ii) exchange correlation functionals and (iii) tight-binding models provide a reliable benchmark for the parameter values. We compare our results with available extended Hückel molecular orbital calculations and discuss its implications for the description of the properties of $κ$-(ET)$_2$Cu$_2$(CN)$_3$. The electronic properties of $κ$-(ET)$_2$Cu(SCN)$_2$ are also briefly discussed.
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