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Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite

Daniel Niesner, Max Wilhelm, Ievgen Levchuk, Andres Osvet, Shreetu Shrestha, Miroslaw Batentschuk, Christoph Brabec, and Thomas Fauster
Phys. Rev. Lett. 117, 126401 – Published 13 September 2016
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Abstract

As they combine decent mobilities with extremely long carrier lifetimes, organic-inorganic perovskites open a whole new field in optoelectronics. Measurements of their underlying electronic structure, however, are still lacking. Using angle-resolved photoelectron spectroscopy, we measure the valence band dispersion of single-crystal CH3NH3PbBr3. The dispersion of the highest energy band is extracted applying a modified leading edge method, which accounts for the particular density of states of organic-inorganic perovskites. The surface Brillouin zone is consistent with bulk-terminated surfaces both in the low-temperature orthorhombic and the high-temperature cubic phase. In the low-temperature phase, we find a ring-shaped valence band maximum with a radius of 0.043Å1, centered around a 0.16 eV deep local minimum in the dispersion of the valence band at the high-symmetry point. Intense circular dichroism is observed. This dispersion is the result of strong spin-orbit coupling. Spin-orbit coupling is also present in the room-temperature phase. The coupling strength is one of the largest ones reported so far.

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  • Received 12 May 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.126401

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Daniel Niesner1,*, Max Wilhelm1, Ievgen Levchuk2, Andres Osvet2, Shreetu Shrestha2, Miroslaw Batentschuk2, Christoph Brabec2,3, and Thomas Fauster1

  • 1Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 7, 91058 Erlangen, Germany
  • 2Institute of Materials for Electronics and Energy Technology (I-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Martensstrasse 7, 91058 Erlangen, Germany
  • 3Bavarian Center for Applied Energy Research (ZAE Bayern), Haberstrasse 2a, 91058 Erlangen, Germany

  • *daniel.niesner@fau.de

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Issue

Vol. 117, Iss. 12 — 16 September 2016

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