Publikation:

Tunable 2D Electron- and 2D Hole States Observed at Fe/SrTiO3 Interfaces

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2024

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Baumgarten, Lutz
Alarab, Fatima
Lechermann, Frank
Strocov, Vladimir N.

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Advanced Materials. Wiley. 2024, 36(15), 2309217. ISSN 0935-9648. eISSN 1521-4095. Verfügbar unter: doi: 10.1002/adma.202309217

Zusammenfassung

Oxide electronics provide the key concepts and materials for enhancing silicon-based semiconductor technologies with novel functionalities. However, a basic but key property of semiconductor devices still needs to be unveiled in its oxidic counterparts: the ability to set or even switch between two types of carriers—either negatively (n) charged electrons or positively (p) charged holes. Here, direct evidence for individually emerging n- or p-type 2D band dispersions in STO-based heterostructures is provided using resonant photoelectron spectroscopy. The key to tuning the carrier character is the oxidation state of an adjacent Fe-based interface layer: For Fe and FeO, hole bands emerge in the empty bandgap region of STO due to hybridization of Ti- and Fe- derived states across the interface, while for Fe3O4 overlayers, an 2D electron system is formed. Unexpected oxygen vacancy characteristics arise for the hole-type interfaces, which as of yet had been exclusively assigned to the emergence of 2DESs. In general, this finding opens up the possibility to straightforwardly switch the type of conductivity at STO interfaces by the oxidation state of a redox overlayer. This will extend the spectrum of phenomena in oxide electronics, including the realization of combined n/p-type all-oxide transistors or logic gates.

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ISO 690DÜRING, Pia Maria, Paul ROSENBERGER, Lutz BAUMGARTEN, Fatima ALARAB, Frank LECHERMANN, Vladimir N. STROCOV, Martina MÜLLER, 2024. Tunable 2D Electron- and 2D Hole States Observed at Fe/SrTiO3 Interfaces. In: Advanced Materials. Wiley. 2024, 36(15), 2309217. ISSN 0935-9648. eISSN 1521-4095. Verfügbar unter: doi: 10.1002/adma.202309217
BibTex
@article{During2024-04Tunab-69384,
  year={2024},
  doi={10.1002/adma.202309217},
  title={Tunable 2D Electron- and 2D Hole States Observed at Fe/SrTiO<sub>3</sub> Interfaces},
  number={15},
  volume={36},
  issn={0935-9648},
  journal={Advanced Materials},
  author={Düring, Pia Maria and Rosenberger, Paul and Baumgarten, Lutz and Alarab, Fatima and Lechermann, Frank and Strocov, Vladimir N. and Müller, Martina},
  note={Article Number: 2309217}
}
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