论文标题
NB掺杂的SRTIO3（001）在空间脱钩的2D PB纳米兰州中的量子井电子状态
Quantum Well Electronic States in Spatially Decoupled 2D Pb Nanoislands on Nb-doped SrTiO3(001)
论文作者
论文摘要
二维（2D）PB纳米群岛已经建立了研究量子大小对生长机制，电子结构以及高温超导性的理想平台。在这里，我们通过扫描隧道显微镜和光谱法扫描了NB掺杂的SRTIO3（001）对2D PB纳米兰州的生长和量子井电子状态。与PB/SI（111），PB/CU（111）和PB/AG（111）相反，在NB掺杂的SRTIO3（001）表面上没有形成的PB润湿层，导致隔离的PB纳米群岛，具有4个原子质层的高度，如该岛的建筑块，其高度明显。根据在占用和无占用能量区域中均匀分析的厚度依赖性量子井状态，恒定组速度VG = 1.804+-0.106 m/s和Fermi WaveVector KF =1.575Å-1，已从PB（111）沿γ-Leedriess的PB（111）频带二级联的线性拟合中提取。另外，通过相蓄积模型获得的能量依赖性散射相位移动ϕ（e）显示出类似于Pb/ag的金属样散射界面（111）。因此，这些空间脱钩的2D PB纳米群岛实现了探索掺杂的钛氧化钛型底物上纳米级超导体中固有的量子限制现象的机会。
Two-dimensional (2D) Pb nanoisland has established an ideal platform for studying the quantum size effects on growth mechanism, electronic structures as well as high-temperature superconductivity. Here, we investigate the growth and quantum well electronic states of the 2D Pb nanoisland on Nb-doped SrTiO3(001) by scanning tunneling microscopy and spectroscopy. In contrast to Pb/Si(111), Pb/Cu(111) and Pb/Ag(111), there is no wetting layer of Pb formed on Nb-doped SrTiO3(001) surface, resulting in isolated Pb nanoislands with an apparent height of 4 atomic layers as the building blocks for the island growth. According to the thickness-dependent quantum well states resolved in both occupied and unoccupied energy regions, the constant group velocity vg = 1.804+-0.106 m/s and Fermi wavevector kF = 1.575 Å-1, have been extracted from a linear fit of the Pb(111) band dipersion along the Γ-L direction. In addition, the energy-dependent scattering phase shift ϕ(E) obtained by means of phase accumulation model shows a metallic-like scattering interface analogous to Pb/Ag(111). These spatially decoupled 2D Pb nanoislands thus realize an opportunity to explore the intrinic quantum confinement phenomena in nanoscale superconductors on the doped titanium-oxide-type substrate.
