Carrier-density control of the SrTiO3 (001) surface 2DEG studied by ARPES

Siobhan Ellen McKeown Walker, Flavio Y Bruno, Zhiming Wang, Alberto de la Torre, Sara Riccó, Anna Tamai, Timur Kim, Moritz Hoesch, Ming Shi, Mohammed Saeed Bahramy, Phil King, Felix Baumberger

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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.

Original languageEnglish
Article number27
Pages (from-to)3894-3899
JournalAdvanced Materials
Issue number26
Early online date22 May 2015
Publication statusPublished - 2015


  • Strontium titanate
  • Angle resolved photoemission spectroscopy
  • Two-dimensional electron gas
  • Oxygen vacancies


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