Control of a two-dimensional electron gas on SrTiO3 (111) by atomic oxygen

S. McKeown Walker; A. De La Torre; F.Y. Bruno; A. Tamai; T.K. Kim; M. Hoesch; M. Shi; M.S. Bahramy; P.D.C. King; F. Baumberger

doi:10.1103/PhysRevLett.113.177601

Control of a two-dimensional electron gas on SrTiO₃ (111) by atomic oxygen

S. McKeown Walker, A. De La Torre, F.Y. Bruno, A. Tamai, T.K. Kim, M. Hoesch, M. Shi, M.S. Bahramy, P.D.C. King, F. Baumberger

Research output: Contribution to journal › Article › peer-review

Abstract

We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO₃. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.

Original language	English
Article number	177601
Journal	Physical Review Letters
Volume	113
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.113.177601
Publication status	Published - 20 Oct 2014

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10.1103/PhysRevLett.113.177601

King_2014_PRL_Control
© 2014 American Physical Society. Reproduced in accordance with APS transfer of copyright agreement. The final version can also be found via the publisher's website: http://dx.doi.org/10.1103/PhysRevLett.113.177601
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title = "Control of a two-dimensional electron gas on SrTiO3 (111) by atomic oxygen",

abstract = "We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.",

author = "{McKeown Walker}, S. and {De La Torre}, A. and F.Y. Bruno and A. Tamai and T.K. Kim and M. Hoesch and M. Shi and M.S. Bahramy and P.D.C. King and F. Baumberger",

note = "This work was supported by Swiss National Science Foundation (200021-146995). P. D. C. K. was supported by the UK-EPSRC and the Royal Society and M. S. B. by Grant-in-Aid for Scientific Research (S) (No. 24224009) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.",

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doi = "10.1103/PhysRevLett.113.177601",

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T1 - Control of a two-dimensional electron gas on SrTiO3 (111) by atomic oxygen

AU - McKeown Walker, S.

AU - De La Torre, A.

AU - Bruno, F.Y.

AU - Tamai, A.

AU - Kim, T.K.

AU - Hoesch, M.

AU - Shi, M.

AU - Bahramy, M.S.

AU - King, P.D.C.

AU - Baumberger, F.

N1 - This work was supported by Swiss National Science Foundation (200021-146995). P. D. C. K. was supported by the UK-EPSRC and the Royal Society and M. S. B. by Grant-in-Aid for Scientific Research (S) (No. 24224009) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.

PY - 2014/10/20

Y1 - 2014/10/20

N2 - We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.

AB - We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.

UR - http://journals.aps.org/prl/supplemental/10.1103/PhysRevLett.113.177601

U2 - 10.1103/PhysRevLett.113.177601

DO - 10.1103/PhysRevLett.113.177601

M3 - Article

AN - SCOPUS:84908139506

SN - 0031-9007

VL - 113

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

M1 - 177601

ER -

Control of a two-dimensional electron gas on SrTiO₃ (111) by atomic oxygen

Abstract

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Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Control of a two-dimensional electron gas on SrTiO3 (111) by atomic oxygen

Abstract

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Projects

Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

Cite this

Control of a two-dimensional electron gas on SrTiO₃ (111) by atomic oxygen