Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite

Niesner D, Wilhelm M, Levchuk I, Osvet A, Shrestha S, Batentschuk M, Brabec C, Fauster T (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016


Book Volume: 117

Article Number: 126401

Journal Issue: 12


DOI: 10.1103/PhysRevLett.117.126401


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 0.043 Å-1, 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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Niesner, D., Wilhelm, M., Levchuk, I., Osvet, A., Shrestha, S., Batentschuk, M.,... Fauster, T. (2016). Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite. Physical Review Letters, 117(12).


Niesner, Daniel, et al. "Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite." Physical Review Letters 117.12 (2016).

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