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 journalArticlepeer-review

100 Citations (Scopus)

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 languageEnglish
Article number177601
JournalPhysical Review Letters
Volume113
Issue number17
DOIs
Publication statusPublished - 20 Oct 2014

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