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arXiv · 2007.13990

Quantum Well Electronic States in Spatially Decoupled 2D Pb Nanoislands on Nb-doped SrTiO3(001)

Guan-Yu Chen·Chia-Hsiu Hsu·Bo-You Liu·Li-Wei Chang·Deng-Sung Lin·Feng-Chuan Chuang·Pin-Jui Hsu
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Abstract

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 {\AA}-1, have been extracted from a linear fit of the Pb(111) band dipersion along the {\Gamma}-L direction. In addition, the energy-dependent scattering phase shift {\phi}(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.

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Guan-Yu Chen, Chia-Hsiu Hsu, Bo-You Liu, Li-Wei Chang, Deng-Sung Lin, Feng-Chuan Chuang, Pin-Jui Hsu. 2020-07-28. Quantum Well Electronic States in Spatially Decoupled 2D Pb Nanoislands on Nb-doped SrTiO3(001). https://doi.org/10.1016/j.apsusc.2020.147967

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