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Carrier-Density Control of the SrTiO3 (001) Surface 2D Electron Gas studied by ARPES
Siobhan McKeown Walker1, Flavio Yair Bruno1, Zhiming Wang2
1Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva, Switzerland.
Advanced Materials (Deerfield Beach, Fla.)
|May 27, 2015
Abstract:
The origin of the 2D electron gas (2DEG)stabilized at the bare surface of SrTiO3 (001) is investigated. Using high-resolution angle-resolved photoemission and core-level spectroscopy, it is shown conclusively that this 2DEG arises from light-induced oxygen vacancies. The dominant mechanism driving vacancy formation is identified, allowing unprecedented control over the 2DEG carrier density.