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High-temperature 2D Fermi surface of SrTiO3 studied by energy-filtered PEEM |
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| Authors: | Claire Mathieu Sara Gonzalez Christophe Lubin Olivier Copie Vitaliy Feyer Claus M. Schneider Nick Barrett |
| Affiliation: | 1. SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif-sur-Yvette Cedex, France;2. SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif-sur-Yvette Cedex, France BaDElPh beamline, Elettra–Sincrotrone Trieste, S.S. 14 km 163.5 in AREA Science Park, Basovizza I-34149 Trieste, Italy;3. Institut Jean Lamour, UMR 7198 CNRS/Université de Lorraine, Vandoeuvre-lès-Nancy, France;4. Peter Grünberg Institute (PGI-6), JARA-FIT, Research Center Jülich, Jülich, Germany NanoESCA beamline, Elettra–Sincrotrone Trieste, S.S. 14 km 163.5 in AREA Science Park, Basovizza I-34149 Trieste, Italy;5. Peter Grünberg Institute (PGI-6), JARA-FIT, Research Center Jülich, Jülich, Germany |
| Abstract: | 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 SrTiO3(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. |
| Keywords: | Fermi surface PEEM SrTiO3 2DEG |