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首页> 外文期刊>The Journal of Chemical Physics >Incommensurate quantum-size oscillations in acene-based molecular wires-Effects of quantum fluctuations
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Incommensurate quantum-size oscillations in acene-based molecular wires-Effects of quantum fluctuations

机译:加入量子尺寸振荡在基于活性的分子线 - 量子波动的影响

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摘要

Molecular wires of the acene-family can be viewed as a physical realization of a two-rung ladder Hamiltonian. For acene-ladders, closed-shell ab initio calculations and elementary zone-folding arguments predict incommensurate gap oscillations as a function of the number of repetitive ring units, N-R, exhibiting a period of about ten rings. Results employing open-shell calculations and a mean-field treatment of interactions suggest anti-ferromagnetic correlations that could potentially open a large gap and wash out the gap oscillations. Within the framework of a Hubbard model with repulsive on-site interaction, U, we employ a Hartree-Fock analysis and the density matrix renormalization group to investigate the interplay of gap oscillations and interactions. We confirm the persistence of incommensurate oscillations in acene-type ladder systems for a significant fraction of parameter space spanned by U and NR. (C) 2017 Author(s).
机译:Acene-族的分子线可以被视为双梯哈密顿人的物理实现。 对于Acene-Ladders,封闭壳AB初始计算和基本区域折叠参数将不计的间隙振荡作为重复环单元的数量N-R的函数预测,表现出大约十个环的时间。 采用开壳计算的结果和相互作用的平均场处理表明抗铁磁相关性可能打开大的间隙并冲出间隙振荡。 在具有令人厌恶的现场交互的Hubbard模型的框架内,我们采用了Hartree-Fock分析和密度矩阵重整化组来调查间隙振荡和相互作用的相互作用。 我们确认了在ACENE型梯形系统中所得振荡的持续存在,以获得U和NR的大部分参数空间。 (c)2017年作者。

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