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Carrier-Density Control of the SrTiO3 (001) Surface 2D Electron Gas studied by ARPES

DOI: 10.1002/adma.201501556 DOI Help
PMID: 26010071 PMID Help

Authors: Siobhan Mckeown Walker (University of Geneva) , Flavio Bruno (University of Geneva) , Zhiming Wang (Swiss Light Source) , Alberto De La Torre (University of Geneva) , Sara Ricco (University of Geneva) , Anna Tamai (University of Geneva) , Timur Kim (Diamond Light Source) , Moritz Hoesch (Diamond Light Source) , Ming Shi (Swiss Light Source) , Mohammad Saeed Bahramy (University of Tokyo) , Philip King (University of St Andrews) , Felix Baumberger (University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Materials

State: Published (Approved)
Published: May 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.

Journal Keywords: Angle-Resolved Photoemission Spectroscopy; 2D Electron Gas; Oxygen Vacancies; Strontium Titanate

Subject Areas: Physics


Instruments: I05-ARPES

Other Facilities: SLS