论文标题
通过SP3碳原子从基础金属底物中脱钩的电子脱钩
Electronic Decoupling of Polyacenes from the Underlying Metal Substrate by sp3 Carbon Atoms
论文作者
论文摘要
我们报告了Sp3杂交碳原子在吸附在金属表面上的碱性衍生物中的作用，即使分子与支撑底物解耦。特别是，我们使用了Ag（100）底物和氢化甲苯分子，其中最长的共轭节段确定其前沿分子轨道相当于连续五个环。 The non-planarity that the sp3 atoms impose on the carbon backbone results in electronically decoupled molecules, as demonstrated by the presence of charging resonances in dI/dV tunneling spectra and the associated double tunneling barriers, or in the Kondo peak that is due to a net spin S=1/2 of the molecule as its LUMO becomes singly charged.从分子充电时的隧道屏障变化以及隧道过程中涉及的不同轨道的隧道屏障变化方面，进一步理解了充电共振的空间依赖性外观作为差分电导光谱中的峰值或下降。
We report on the effect of sp3 hybridized carbon atoms in acene derivatives adsorbed on metal surfaces, namely decoupling the molecules from the supporting substrates. In particular, we have used a Ag(100) substrate and hydrogenated heptacene molecules, in which the longest conjugated segment determining its frontier molecular orbitals amounts to five consecutive rings. The non-planarity that the sp3 atoms impose on the carbon backbone results in electronically decoupled molecules, as demonstrated by the presence of charging resonances in dI/dV tunneling spectra and the associated double tunneling barriers, or in the Kondo peak that is due to a net spin S=1/2 of the molecule as its LUMO becomes singly charged. The spatially dependent appearance of the charging resonances as peaks or dips in the differential conductance spectra is further understood in terms of the tunneling barrier variation upon molecular charging, as well as of the different orbitals involved in the tunneling process.
