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The European Physical Journal Special Topics

, Volume 228, Issue 3, pp 669–673 | Cite as

Infrared spectroscopy of two-dimensional electron systems

  • Paolo CalvaniEmail author
  • Alexei Kalaboukhov
  • Pavel P. Shibayev
  • M. Salehi
  • J. Moon
  • Seongshik Oh
  • Enrico Falsetti
  • Michele Ortolani
  • Fabio Miletto Granozio
  • Jean-Blaise Brubach
  • Pascale Roy
  • Alessandro Nucara
Regular Article
  • 24 Downloads
Part of the following topical collections:
  1. Superconductivity and Functional Oxides

Abstract

We have used grazing-angle infrared spectroscopy with polarized radiation to detect the Berreman effect (BE) in the two-dimensional electron systems (2DES) which form spontaneously at two interfaces: one between an amorphous film LaAlO3 and its SrTiO3 substrate (LAO/STO), and another at the interface between the topological insulator (TI) Bi2Se3 and its sapphire substrate. In both systems we have thus extracted the 2DES parameters at different temperatures. In the quasi-2DES under amorphous LAO, the surface density ns is higher than under crystalline LAO, while the mobility is nearly the same and the thickness d is 7 nm. In ultrapure Bi2Se3 on sapphire, preliminary data provided d < 1 nm and ns ≈ 1013 cm−2, indicating, by comparison with existing estimates, that the BE indeed detects the topological surface states.

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References

  1. 1.
    A. Ohtomo et al., Nature 419, 378 (2002) ADSCrossRefGoogle Scholar
  2. 2.
    A. Ohtomo, H.Y. Hwang, Nature 427, 423 (2004) ADSCrossRefGoogle Scholar
  3. 3.
    J. Mannhart, D.G. Schlom, Science 327, 1607 (2010) ADSCrossRefGoogle Scholar
  4. 4.
    D.W. Berreman, Phys. Rev. 130, 2193 (1963) ADSCrossRefGoogle Scholar
  5. 5.
    A. Dubroka, M. Rössle, K.W. Kim, V.K. Malik, L. Schultz, S. Thiel, C.W. Schneider, J. Mannhart, G. Herranz, O. Copie, M. Bibes, A. Barthélémy, C. Bernhard, Phys. Rev. Lett. 104, 156807 (2010) ADSCrossRefGoogle Scholar
  6. 6.
    A. Nucara, M. Corasaniti, A. Kalaboukhov, M. Ortolani, E. Falsetti, A. Sambri, F. Miletto Granozio, F. Capitani, J.-B. Brubach, P. Roy, U. Schade, P. Calvani, Phys. Rev. B 97, 155126 (2018) ADSCrossRefGoogle Scholar
  7. 7.
    B. Harbecke, B. Heinz, P. Grosse, Appl. Phys. A 38, 263 (1985) ADSCrossRefGoogle Scholar
  8. 8.
    P.P. Aurino, A. Kalaboukhov, N. Tuzla, E. Olsson, T. Claeson, D. Winkler, Appl. Phys. Lett. 102, 201610 (2013) ADSCrossRefGoogle Scholar
  9. 9.
    M. Dressel, G. Grüner, Electrodynamics of Solids (Cambridge University Press, Cambridge, 2002) Google Scholar
  10. 10.
    C.L. Kane, E.J. Mele, Phys. Rev. Lett. 95, 226801 (2005) ADSCrossRefGoogle Scholar
  11. 11.
    N.P. Butch, K. Kirshenbaum, P. Syers, A.B. Sushkov, G.S. Jenkins, H.D. Drew, J. Paglione, Phys. Rev. B 81, 241301 (2010) ADSCrossRefGoogle Scholar
  12. 12.
    M. Brahlek, N. Koirala, N. Bansal, S. Oh, Solid State Commun. 54, 215 (2014) Google Scholar
  13. 13.
    N. Bansal, Y.S. Kim, M. Brahlek, E. Edrey, S. Oh, Phys. Rev. Lett. 109, 116804 (2012) ADSCrossRefGoogle Scholar
  14. 14.
    P. Di Pietro, M. Ortolani, O. Limaj, A. Di Gaspare, V. Giliberti, F. Giorgianni, M. Brahlek, N. Bansal, N. Koirala, S. Oh, P. Calvani, S. Lupi, Nat. Nanotechnol. 8, 556 (2013) ADSCrossRefGoogle Scholar
  15. 15.
    P. Di Pietro, F.M. Vitucci, D. Nicoletti, L. Baldassarre, P. Calvani, R. Cava, Y.S. Hor, U. Schade, S. Lupi, Phys. Rev. B 86, 045439 (2012) ADSCrossRefGoogle Scholar

Copyright information

© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Paolo Calvani
    • 1
    Email author
  • Alexei Kalaboukhov
    • 2
  • Pavel P. Shibayev
    • 3
  • M. Salehi
    • 3
  • J. Moon
    • 3
  • Seongshik Oh
    • 3
  • Enrico Falsetti
    • 4
  • Michele Ortolani
    • 4
  • Fabio Miletto Granozio
    • 5
  • Jean-Blaise Brubach
    • 6
  • Pascale Roy
    • 6
  • Alessandro Nucara
    • 1
  1. 1.CNR-SPIN and Dipartimento di Fisica, Universitá di Roma “La Sapienza”RomaItaly
  2. 2.Department of Microtechnology & NanoscienceChalmers UniversityGothenburgSweden
  3. 3.Rutgers, The State University of New JerseyPiscatawayUSA
  4. 4.Dipartimento di Fisica, Universitá di Roma La SapienzaRomaItaly
  5. 5.CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant’AngeloNapoliItaly
  6. 6.Synchrotron SOLEILGif-sur-YvetteFrance

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