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High‐temperature 2D Fermi surface of SrTiO 3 studied by energy‐filtered PEEM
Author(s) -
Mathieu Claire,
Gonzalez Sara,
Lubin Christophe,
Copie Olivier,
Feyer Vitaliy,
Schneider Claus M.,
Barrett Nick
Publication year - 2019
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6533
Subject(s) - photoemission electron microscopy , fermi level , oxide , electronic structure , fermi gas , chemistry , fermi energy , condensed matter physics , nanotechnology , materials science , electron , chemical physics , electron microscope , physics , optics , organic chemistry , quantum mechanics
Functional oxides displaying phenomena such as 2D electron gas (2DEG) at oxide interfaces represent potential technological breakthroughs for post‐CMOS (Complementary Metal Oxide Semiconductor) electronics. Noninvasive techniques are required to study the surface chemistry and electronic structure underlying their often unique electrical properties. The sensitivity of photoemission electron microscopy (PEEM) to local potential, chemistry, and electronic structure makes it an invaluable tool for probing the near surface region of microscopic regions and domains of functional materials. In particular, PEEM allows single shot acquisition of the 2D Fermi surface and full angular probing of the symmetry‐induced intensity modulations. We present results demonstrating a 2DEG at the surface of SrTiO 3 (001) at 140 K. The 2DEG is created by soft X‐ray irradiation and can be reversibly controlled by a combination of soft X‐rays and oxygen partial pressure.