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  1. Friedrich-Alexander-Universität
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Lehrstuhl für Festkörperphysik (FKP)

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      • AG Fauster
      • AG Schneider
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  4. Topological insulators and Rashba systems

Topological insulators and Rashba systems

In page navigation: Research
  • Publications
    • Publications (Fauster)
    • Publications (Niesner)
  • Workgroups
    • AG Fauster
    • AG Niesner
    • AG Schneider
      • Publications (Schneider)
  • Methods
    • Two-photon photoemission
    • Scanning tunneling microscopy
    • Low energy electron diffraction
  • Topics
    • Molecules on surfaces
    • Synthetic carbon allotropes
    • Topological insulators and Rashba systems
    • Lead halide perovskites
    • Metal oxide surfaces, thin films, and nanostructures
    • Surface atomic structure determination
  • Project funding

Topological insulators and Rashba systems

Unoccupied surface band structure of a topological insulator from measurements and calculations. From Niesner et al., PRB 2014.

In traditional semiconductors, electronic properties like the band structure and the charge transport are widely independent of the electron spin. This is different in ‘spintronics’, which aim to design highly efficient devices by manipulating electron spins. Therefore, materials are needed in which a spin polarization can be generated, transported, and ultimately switched.

Both topological insulators and Rashba systems have spin-polarized rather than spin-degenerate electronic bands, even though they are not magnetic. In topological insulators, the spin-polarized states are metallic and localized at the surface of an, ideally insulating, bulk material. Rashba systems have semiconducting spin-polarized bands, which can occur both at surfaces or in bulk materials.

We use angle-resolved photoelectron spectroscopy to study the electronic structure of new Rashba systems and topological insulators. Femtosecond time-resolved experiments are applied to investigate the fundamental electron and spin dynamics in these systems. Techniques using circularly polarized light have proven particularly useful for this purpose. The research is done within an international network of collaborations with theoretical physicists and experts in crystal growth

Contact

  • Dr. Daniel Niesner
  • Prof. Dr. Thomas Fauster (Website: https://www.fkp.physik.nat.fau.eu/person/thomas-fauster/)

Publications

  • Niesner D., Hauck M., Shrestha S., Levchuk I., Matt G., Osvet A., Batentschuk M., Brabec C., Weber HB., Fauster T.:
    Structural fluctuations cause spin-split states in tetragonal (CH₃NH₃)PbI₃ as evidenced by the circular photogalvanic effect
    In: Proceedings of the National Academy of Sciences of the United States of America 115 (2018), p. 9509-9514
    ISSN: 0027-8424
    DOI: 10.1073/pnas.1805422115
  • Rosenzweig P., Otto S., Fauster T.:
    Complex manifold of Rashba and image-potential states on Bi/Ag(111)
    In: Physical Review B 98 (2018), Article No.: 085430
    ISSN: 2469-9950
    DOI: 10.1103/PhysRevB.98.085430
  • Ketterl AS., Otto S., Bastian M., Andres B., Gahl C., Minar J., Ebert H., Braun J., Tereshchenko OE., Kokh KA., Fauster T., Weinelt M.:
    Origin of spin-polarized photocurrents in the topological surface states of Bi2Se3
    In: Physical Review B 98 (2018), Article No.: 155406
    ISSN: 2469-9950
    DOI: 10.1103/PhysRevB.98.155406
  • Kellner J., Bihlmayer G., Liebmann M., Otto S., Pauly C., Boschker JE., Bragaglia V., Cecchi S., Wang RN., Deringer VL., Küppers P., Bhaskar P., Golias E., Sánchez-Barriga J., Dronskowski R., Fauster T., Rader O., Calarco R., Morgenstern M.:
    Mapping the band structure of GeSbTe phase change alloys around the Fermi level
    In: Communications Physics 1 (2018), Article No.: 5
    ISSN: 2399-3650
    DOI: 10.1038/s42005-018-0005-8
  • Niesner D., Wilhelm M., Levchuk I., Osvet A., Shrestha S., Batentschuk M., Brabec C., Fauster T.:
    Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite
    In: Physical Review Letters 117 (2016), Article No.: 126401
    ISSN: 0031-9007
    DOI: 10.1103/PhysRevLett.117.126401
    URL: http://link.aps.org/doi/10.1103/PhysRevLett.117.126401
  • Niesner D., Otto S., Hermann V., Fauster T., Menshchikova TV., Eremeev SV., Aliev ZS., Amiraslanov IR., Babanly MB., Echenique PM., Chulkov EV.:
    Bulk and surface electron dynamics in a p-type topological insulator SnSb2Te4
    In: Physical Review B 89 (2014), Article No.: 081404
    ISSN: 1098-0121
    DOI: 10.1103/PhysRevB.89.081404
  • Niesner D., Otto S., Fauster T., Chulkov EV., Eremeev SV., Tereshchenko OE., Kokh KA.:
    Electron dynamics of unoccupied states in topological insulators
    In: Journal of Electron Spectroscopy and Related Phenomena 195 (2014), p. 258-262
    ISSN: 0368-2048
    DOI: 10.1016/j.elspec.2014.03.013
  • Niesner D., Fauster T., Eremeev SV., Menshchikova TV., Koroteev YM., Protogenov AP., Chulkov EV., Tereshchenko OE., Kokh KA., Alekperov O., Nadjafov A., Mamedov N.:
    Unoccupied topological states on bismuth chalcogenides
    In: Physical Review B 86 (2012), Article No.: 205403
    ISSN: 1098-0121
    DOI: 10.1103/PhysRevB.86.205403
Lehrstuhl für Festkörperphysik
Friedrich-Alexander-Universität Erlangen-Nürnberg

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