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

DOI: 10.1103/PhysRevLett.113.177601
PMID: 25379937

Authors: S. Mckeown Walker (University of Geneva) , A. De La Torre (University of Geneva) , F. Y. Bruno (University of Geneva) , A. Tamai (University of Geneva) , T. K. Kim (Diamond Light Source) , M. Hoesch (Diamond Light Source) , M. Shi (Swiss Light Source) , M. S. Bahramy (The University of Tokyo; RIKEN Center for Emergent Matter Science (CEMS)) , P. D. C. King (University of St Andrews) , F. Baumberger (University of Geneva; Swiss Light Source; University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 113 (17)

State: Published (Approved)
Published: October 2014

Abstract: We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO 3 . 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.

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Other Facilities: SIS at SLS

Added On: 07/12/2014 17:35

Discipline Tags:

Surfaces Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)