半金属ErAs纳米粒子嵌入GaAs中的局域态密度和界面效应
Local Density of States and Interface Effects in Semimetallic ErAs Nanoparticles Embedded in GaAs
摘要：
ErAs纳米粒子嵌入GaAs矩阵的原子和电子结构的检查通过截面扫描隧道显微镜和光谱（XSTM/XSTS）。局域态密度（LDOS）表现出有限的最小费米能级表明，纳米粒子保持半金属，尽管在ErAs的量子限制以前的模型的预测。我们还使用XSTS测量整个ErAs/GaAs界面的LDOS的变化，并提出界面原子结构的结果，防止带隙的开放的电子状态。
英文摘要：
The atomic and electronic structures of ErAs nanoparticles embedded within a GaAs matrix are examined via cross-sectional scanning tunneling microscopy and spectroscopy (XSTM/XSTS). The local density of states (LDOS) exhibits a finite minimum at the Fermi level demonstrating that the nanoparticles remain semimetallic despite the predictions of previous models of quantum confinement in ErAs. We also use XSTS to measure changes in the LDOS across the ErAs/GaAs interface and propose that the interface atomic structure results in electronic states that prevent the opening of a band gap.
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