Atomically Precise Lateral Modulation of a Two-Dimensional Electron Liquid in Anatase TiO2 Thin Films.

@article{Wang2017AtomicallyPL,
  title={Atomically Precise Lateral Modulation of a Two-Dimensional Electron Liquid in Anatase TiO2 Thin Films.},
  author={Z Wang and Zhang Zhong and Siobhan McKeown Walker and Zoran Risti{\'c} and J-Z Ma and Flavio Y. Bruno and Sara Ricc{\'o} and Giorgio Sangiovanni and Gyula Eres and Nicholas C. Plumb and Luc Patthey and Ming Shi and Jo{\"e}l M{\'e}sot and Felix Baumberger and Milan Radovi{\'c}},
  journal={Nano letters},
  year={2017},
  volume={17 4},
  pages={
          2561-2567
        }
}
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… 
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  • 2017
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References

SHOWING 1-10 OF 44 REFERENCES
Engineering two-dimensional electron gases at the (001) and (101) surfaces of TiO 2 anatase using light
We report the existence of metallic two-dimensional electron gases (2DEGs) at the (001) and (101) surfaces of bulk-insulating TiO2 anatase due to local chemical doping by oxygen vacancies in the
Extreme mobility enhancement of two-dimensional electron gases at oxide interfaces by charge-transfer-induced modulation doping.
TLDR
It is shown that the electron mobility is enhanced by more than two orders of magnitude by inserting a single-unit-cell insulating layer of polar La(1-x)Sr(x)MnO3 at the interface between disordered LaAlO3 and crystalline SrTiO3 produced at room temperature.
Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface.
TLDR
It is shown that a similar two-dimensional electron gas, with an electron density as large as 8×10(13)  cm(-2), can be formed at the bare SrTiO(3) surface, and that the 2DEG density can be controlled through exposure of the surface to intense ultraviolet light.
Tailoring the nature and strength of electron-phonon interactions in the SrTiO3(001) 2D electron liquid.
TLDR
The prototypical two-dimensional electron liquid at the SrTiO3(001) surface is used to reveal a remarkably complex evolution of electron-phonon coupling with the tunable carrier density of this system, and constraints on the theoretical description of superconductivity are placed.
Two-dimensional electron gas with universal subbands at the surface of SrTiO3
TLDR
It is shown, using angle-resolved photoemission spectroscopy, that there is a highly metallic universal 2DEG at the vacuum-cleaved surface of SrTiO3 (including the non-doped insulating material) independently of bulk carrier densities over more than seven decades.
Nanoscale control of an interfacial metal-insulator transition at room temperature.
TLDR
The creation and erasure of nanoscale conducting regions at the interface between two insulating oxides, LaAlO3 and SrTiO3 are reported.
A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface
TLDR
A model interface is examined between two insulating perovskite oxides—LaAlO3 and SrTiO3—in which the termination layer at the interface is controlled on an atomic scale, presenting a broad opportunity to tailor low-dimensional charge states by atomically engineered oxide heteroepitaxy.
Formation and Observation of a Quasi-Two-Dimensional dxy Electron Liquid in Epitaxially Stabilized Sr(2-x)La(x)TiO4 Thin Films.
TLDR
An interplay of disorder and electron-phonon coupling acting cooperatively at similar energy scales provides a possible mechanism for explaining the low free carrier concentrations observed at various oxide heterostructures such as the LaAlO3/SrTiO3 interface.
Why some interfaces cannot be sharp
A central goal of modern materials physics and nanoscience is the control of materials and their interfaces to atomic dimensions. For interfaces between polar and nonpolar layers, this goal is
Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO3.
TLDR
Despite the strong spin-orbit coupling, the measurements provide a direct upper bound for the potential Rashba spin splitting of only Δk(parallel)}~0.02 Å(-1) at the Fermi level.
...
1
2
3
4
5
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