Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films

Wang, Zhiming; Zhong, Z.; Walker, S. McKeown; Ristic, Z.; Ma, J. -Z.; Bruno, F. Y.; Riccò, S.; Sangiovanni, G.; Eres, Gyula; Plumb, Nicholas C.; Patthey, L.; Shi, M.; Mesot, J.; Baumberger, Felix; Radovic, Milan

doi:10.1021/acs.nanolett.7b00317

Title: Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO₂ thin films

Journal Article · Fri Mar 10 00:00:00 EST 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b00317· OSTI ID:1351790

^[1]; Zhong, Z. ^[2]; Walker, S. McKeown ^[3]; Ristic, Z. ^[4]; Ma, J. -Z. ^[5];

^[3]; Riccò, S. ^[3]; Sangiovanni, G. ^[2]; Eres, Gyula ^[6]; Plumb, Nicholas C. ^[7]; Patthey, L. ^[7]; Shi, M. ^[7]; Mesot, J. ^[8]; Baumberger, Felix ^[9]; Radovic, Milan ^[7]

Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. of Geneva, Geneva (Switzerland); Chinese Academy of Sciences, Ningbo (People's Republic of China)
Univ. Wurzburg, Wurzburg (Germany)
Univ. of Geneva, Geneva (Switzerland)
Ecole Polytechnique Federale Lausanne (EPFL), Lausanne (Switzlerland)
Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Ecole Polytechnique Federale Lausanne (EPFL), Lausanne (Switzlerland); ETH Zurich, Zurich (Switzerland)
Univ. of Geneva, Geneva (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)

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 photo-stimulated 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. Furthermore, 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1351790

Journal Information:: Nano Letters, Vol. 17, Issue 4; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Band Structure and Spin–Orbital Texture of the (111)‐KTaO ₃ 2D Electron Gas Bruno, Flavio Y.; McKeown Walker, Siobhan; Riccò, Sara Advanced Electronic Materials, Vol. 5, Issue 5 https://doi.org/10.1002/aelm.201800860	journal	March 2019
The Itinerant 2D Electron Gas of the Indium Oxide (111) Surface: Implications for Carbon‐ and Energy‐Conversion Applications Jovic, Vedran; Moser, Simon; Papadogianni, Alexandra Small, Vol. 16, Issue 12 https://doi.org/10.1002/smll.201903321	journal	March 2020
Band Structure and Spin–Orbital Texture of the $(111)‐KTaO_{3}$ 2D Electron Gas Bruno, Flavio Y.; McKeown Walker, Siobhan; Riccò, Sara Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-05605	text	January 2019

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36 MATERIALS SCIENCE
anatase titanium dioxide
angle resolved photoemission spectroscopy
two-dimensional electron liquid
lateral patterning
surface reconstruction

Title: Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films

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Title: Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO₂ thin films