Tunable two-dimensional electron system at the (110) surface of SnO2

J. Dai; E. Frantzeskakis; F. Fortuna; P. Lömker; R. Yukawa; M. Thees; S. Sengupta; P. Le Fèvre; F. Bertran; J. E. Rault; K. Horiba; M. Müller; H. Kumigashira; A. F. Santander-Syro

doi:10.1103/PhysRevB.101.085121

Tunable two-dimensional electron system at the (110) surface of SnO2

J. Dai, E. Frantzeskakis, F. Fortuna, P. Lömker, R. Yukawa, M. Thees, S. Sengupta, P. Le Fèvre, F. Bertran, J. E. Rault, K. Horiba, M. Müller, H. Kumigashira, A. F. Santander-Syro

Division of Organic- and Biomaterials Research

Research output: Contribution to journal › Article › peer-review

Abstract

We report the observation of a two-dimensional electron system (2DES) at the (110) surface of the transparent bulk insulator SnO2 and the tunability of its carrier density by means of temperature or Eu deposition. The 2DES is insensitive to surface reconstructions and, surprisingly, it survives even after exposure to ambient conditions- A n extraordinary fact recalling the well known catalytic properties SnO2. Our data show that surface oxygen vacancies are at the origin of such 2DES, providing key information about the long-debated origin of n-type conductivity in SnO2, at the basis of a wide range of applications. Furthermore, our study shows that the emergence of a 2DES in a given oxide depends on a delicate interplay between its crystal structure and the orbital character of its conduction band.

Original language	English
Article number	085121
Journal	Physical Review B
Volume	101
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.101.085121
Publication status	Published - 2020 Feb 15

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Tunable two-dimensional electron system at the (110) surface of SnO2. / Dai, J.; Frantzeskakis, E.; Fortuna, F.; Lömker, P.; Yukawa, R.; Thees, M.; Sengupta, S.; Le Fèvre, P.; Bertran, F.; Rault, J. E.; Horiba, K.; Müller, M.; Kumigashira, H.; Santander-Syro, A. F.

In: Physical Review B, Vol. 101, No. 8, 085121, 15.02.2020.

Research output: Contribution to journal › Article › peer-review

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title = "Tunable two-dimensional electron system at the (110) surface of SnO2",

abstract = "We report the observation of a two-dimensional electron system (2DES) at the (110) surface of the transparent bulk insulator SnO2 and the tunability of its carrier density by means of temperature or Eu deposition. The 2DES is insensitive to surface reconstructions and, surprisingly, it survives even after exposure to ambient conditions- A n extraordinary fact recalling the well known catalytic properties SnO2. Our data show that surface oxygen vacancies are at the origin of such 2DES, providing key information about the long-debated origin of n-type conductivity in SnO2, at the basis of a wide range of applications. Furthermore, our study shows that the emergence of a 2DES in a given oxide depends on a delicate interplay between its crystal structure and the orbital character of its conduction band.",

author = "J. Dai and E. Frantzeskakis and F. Fortuna and P. L{\"o}mker and R. Yukawa and M. Thees and S. Sengupta and {Le F{\`e}vre}, P. and F. Bertran and Rault, {J. E.} and K. Horiba and M. M{\"u}ller and H. Kumigashira and Santander-Syro, {A. F.}",

note = "Funding Information: Work at CSNSM and ISMO was supported by public grants from the Centre National de la Recherche Scientifique (CNRS, project PICS FermiAds No. 272651), the French National Research Agency (ANR, project LACUNES No. ANR-13-BS04-0006-01), and the “Laboratoire d'Excellence Physique Atomes Lumi{\`e}re Mati{\`e}re” (LabEx PALM, projects ELECTROX, 2DEGS2USE and 2DTROX) overseen by the ANR as part of the “Investissements d'Avenir” program (reference: ANR-10-LABX-0039). Work at KEK-PF was supported by Grants-in-Aid for Scientific Research (Nos. 16H02115 and 16KK0107) from the Japan Society for the Promotion of Science (JSPS). Experiments at KEK-PF were performed under the approval of the Program Advisory Committee (Proposals 2016G621, 2015S2005, and 2018S2004) at the Institute of Materials Structure Science at KEK. ",

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AU - Thees, M.

AU - Sengupta, S.

AU - Le Fèvre, P.

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AU - Rault, J. E.

AU - Horiba, K.

AU - Müller, M.

AU - Kumigashira, H.

AU - Santander-Syro, A. F.

N1 - Funding Information: Work at CSNSM and ISMO was supported by public grants from the Centre National de la Recherche Scientifique (CNRS, project PICS FermiAds No. 272651), the French National Research Agency (ANR, project LACUNES No. ANR-13-BS04-0006-01), and the “Laboratoire d'Excellence Physique Atomes Lumière Matière” (LabEx PALM, projects ELECTROX, 2DEGS2USE and 2DTROX) overseen by the ANR as part of the “Investissements d'Avenir” program (reference: ANR-10-LABX-0039). Work at KEK-PF was supported by Grants-in-Aid for Scientific Research (Nos. 16H02115 and 16KK0107) from the Japan Society for the Promotion of Science (JSPS). Experiments at KEK-PF were performed under the approval of the Program Advisory Committee (Proposals 2016G621, 2015S2005, and 2018S2004) at the Institute of Materials Structure Science at KEK.

PY - 2020/2/15

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N2 - We report the observation of a two-dimensional electron system (2DES) at the (110) surface of the transparent bulk insulator SnO2 and the tunability of its carrier density by means of temperature or Eu deposition. The 2DES is insensitive to surface reconstructions and, surprisingly, it survives even after exposure to ambient conditions- A n extraordinary fact recalling the well known catalytic properties SnO2. Our data show that surface oxygen vacancies are at the origin of such 2DES, providing key information about the long-debated origin of n-type conductivity in SnO2, at the basis of a wide range of applications. Furthermore, our study shows that the emergence of a 2DES in a given oxide depends on a delicate interplay between its crystal structure and the orbital character of its conduction band.

AB - We report the observation of a two-dimensional electron system (2DES) at the (110) surface of the transparent bulk insulator SnO2 and the tunability of its carrier density by means of temperature or Eu deposition. The 2DES is insensitive to surface reconstructions and, surprisingly, it survives even after exposure to ambient conditions- A n extraordinary fact recalling the well known catalytic properties SnO2. Our data show that surface oxygen vacancies are at the origin of such 2DES, providing key information about the long-debated origin of n-type conductivity in SnO2, at the basis of a wide range of applications. Furthermore, our study shows that the emergence of a 2DES in a given oxide depends on a delicate interplay between its crystal structure and the orbital character of its conduction band.

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