场发射谐振中能带结构对波函数损耗的影响
Impact of Band Structure on Wave Function Dissipation in Field Emission Resonance
摘要：
我们在Ag（111）和Ag（100）表面上证明了场发射共振（FER）线宽的倒数随电场的变化而变化，它与FER中共振电子的平均寿命成正比。Ag（111）的变化几乎是平滑的，而Ag（100）的变化是零星的，波动很大。这种巨大的差异可以通过它们不同的投影体能带结构和量子力学的系综解释来解释，根据量子力学的系综解释，所有共振电子都由单个波函数控制。Ag（100）具有高于其真空能级的能隙，而Ag（111）没有。因此，与FER线宽相关的波函数的耗散率在Ag（111）上几乎稳定，而在Ag（100）上波动。研究结果表明，通过FER可以研究Ag（100）表面的量子俘获效应和表面偶极层。
英文摘要：
We demonstrated on Ag(111) and Ag(100) surfaces that the reciprocal of the field emission resonance (FER) linewidth, which is proportional to the mean lifetime of resonant electrons in FER, may vary with the electric field. The variation on Ag(111) was nearly smooth, whereas that on Ag(100) was sporadic and fluctuated remarkably. This drastic difference can be explained through their dissimilar projected bulk band structures and the ensemble interpretation of quantum mechanics, according to which all resonant electrons are governed by a single wave function. Ag(100) has an energy gap above its vacuum level, whereas Ag(111) does not. Consequently, the dissipation rate of the wave function, which is relevant to the FER linewidth, on Ag(111) was almost stable, whereas that on Ag(100) fluctuated. The fluctuation revealed that the quantum trapping effect and surface dipole layer on Ag(100) surface can be investigated through FER.
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