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Tunable two-dimensional electron system at the (110) surface of SnO<sub>2</sub>

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

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DAI, J., Emmanouil FRANTZESKAKIS, Franck FORTUNA, Patrick LÖMKER, R. YUKAWA, M. THEES, Shamashis SENGUPTA, Patrick LE FÈVRE, Martina MÜLLER, Andrés F. SANTANDER-SYRO, 2020. Tunable two-dimensional electron system at the (110) surface of SnO2. In: Physical Review B. American Physical Society (APS). 101(8), 085121. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.101.085121

@article{Dai2020-02-16T21:13:41ZTunab-53582, title={Tunable two-dimensional electron system at the (110) surface of SnO2}, year={2020}, doi={10.1103/PhysRevB.101.085121}, number={8}, volume={101}, issn={2469-9950}, journal={Physical Review B}, author={Dai, J. and Frantzeskakis, Emmanouil and Fortuna, Franck and Lömker, Patrick and Yukawa, R. and Thees, M. and Sengupta, Shamashis and Le Fèvre, Patrick and Müller, Martina and Santander-Syro, Andrés F.}, note={Article Number: 085121} }

Sengupta, Shamashis 2020-02-16T21:13:41Z Tunable two-dimensional electron system at the (110) surface of SnO<sub>2</sub> Dai, J. Fortuna, Franck eng Müller, Martina Sengupta, Shamashis Frantzeskakis, Emmanouil Santander-Syro, Andrés F. Le Fèvre, Patrick Müller, Martina Santander-Syro, Andrés F. Thees, M. Le Fèvre, Patrick Fortuna, Franck 2021-05-04T11:20:47Z We report the observation of a two-dimensional electron system (2DES) at the (110) surface of the transparent bulk insulator SnO<sub>2</sub> 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—an extraordinary fact recalling the well known catalytic properties SnO<sub>2</sub>. 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 SnO<sub>2</sub>, 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. Frantzeskakis, Emmanouil Yukawa, R. Yukawa, R. Lömker, Patrick Thees, M. 2021-05-04T11:20:47Z terms-of-use Dai, J. Lömker, Patrick

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