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

Authors :: Walker SM
Bruno FY
Wang Z
de la Torre A
Riccó S
Tamai A
Kim TK
Hoesch M
Shi M
Bahramy MS
King PD
Baumberger F
Source :: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2015 Jul 08; Vol. 27 (26), pp. 3894-9. Date of Electronic Publication: 2015 May 22.
Publication Year :: 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.<br /> (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

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