期刊
NANO LETTERS
卷 17, 期 4, 页码 2561-2567出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00317
关键词
Titanium dioxide; two-dimensional electron liquid; surface reconstruction; lateral patterning; angle-resolved photoemission spectroscopy
类别
资金
- Alexander von Humboldt fellowship
- Swiss National Science Foundation [200021-146995]
- DFG [SFB 1170]
- Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U.S. Department of Energy
- Swiss National Science Foundation (SNF) [200021_146995] Funding Source: Swiss National Science Foundation (SNF)
Engineering the electronic band structure of two-dimensional electron liquids (2DELs) confined at the surface or interface of transition metal oxides is key to unlocking their full potential. Here we describe a new approach to tailoring the electronic structure of an oxide surface 2DEL demonstrating the lateral modulation of electronic states with atomic scale precision on an unprecedented length scale comparable to the Fermi wavelength. To this end, we use pulsed laser deposition to grow anatase TiO2 films terminated by a (1 x 4) in-plane surface reconstruction. Employing photostimulated chemical surface doping we induce 2DELs with tunable carrier densities that are confined within a few TiO2 layers below the surface. Subsequent in situ angle-resolved photoemission experiments demonstrate that the (1 x 4) surface reconstruction provides a periodic lateral perturbation of the electron liquid. This causes strong backfolding of the electronic bands, opening of unidirectional gaps and a saddle point singularity in the density of states near the chemical potential.
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