有一篇文章中是这样描述的 In order to understand the electronic transport properties, the transmission spectra of these four systems under zero bias are plotted in Fig. 3. For ZGNR, a transmission peak appears around the Fermi level Ef and the quantum platform is observed. 有没有哪位大神解释一下在没有施加偏压时候,透射谱在费米能级附近出现的特征峰是什么物理意义????