Hybrid organic-inorganic perovskites (HOIPs) are prime candidates for studying Rashba effects due to the heavy metal and halogen atoms in their crystal structure coupled with predicted inversion symmetry breaking. Nevertheless, observation of the Rashba effect in cubic CH3NH3PbBr3 single crystals that possess bulk inversion symmetry is the subject of extensive debate due to the lack of conclusive experiments and theoretical explanations. Here, we provide experimental evidence that Rashba state in cubic CH3NH3PbBr3 single crystals at room temperature occurs exclusively on the crystal surface and depends on specific surface termination that results in local symmetry breaking. We demonstrate this using a suite of spatially resolved and depth-sensitive techniques, including circular photogalvanic effect, inverse spin Hall effect, and multiphoton microscopy, that are supported by first principle calculations. Our work suggests using surface Rashba states in these materials for spintronic applications.
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Observation of spatially resolved Rashba states on the surface of CH3NH3PbBr3 single crystals
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September 2021
Research Article|
July 30 2021
Observation of spatially resolved Rashba states on the surface of CH3NH3PbBr3 single crystals
Zhengjie Huang;
Zhengjie Huang
1
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
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Shai R. Vardeny;
Shai R. Vardeny
2
Center for Integrated Nanotechnologies, Los Alamos National Laboratory
, Los Alamos, New Mexico, 87545, USA
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Tonghui Wang;
Tonghui Wang
3
Department of Materials Science and Engineering and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
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Zeeshan Ahmad
;
Zeeshan Ahmad
4
Pritzker School of Molecular Engineering, University of Chicago
, Chicago, Illinois 60637, USA
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Ashish Chanana
;
Ashish Chanana
5
Department of Physics and Astronomy, University of Utah
, Salt Lake City, Utah 84112, USA
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Eric Vetter;
Eric Vetter
1
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
3
Department of Materials Science and Engineering and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
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Shijia Yang;
Shijia Yang
1
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
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Xiaojie Liu;
Xiaojie Liu
5
Department of Physics and Astronomy, University of Utah
, Salt Lake City, Utah 84112, USA
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Giulia Galli
;
Giulia Galli
4
Pritzker School of Molecular Engineering, University of Chicago
, Chicago, Illinois 60637, USA
6
Department of Chemistry, University of Chicago
, Chicago, Illinois 60637, USA
7
Argonne National Laboratory
, Lemont, Illinois 60439, USA
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Aram Amassian
;
Aram Amassian
a)
3
Department of Materials Science and Engineering and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
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Z. Valy Vardeny
;
Z. Valy Vardeny
a)
5
Department of Physics and Astronomy, University of Utah
, Salt Lake City, Utah 84112, USA
a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
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Dali Sun
Dali Sun
a)
1
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University
, Raleigh, North Carolina 27695, USA
a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
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a)Authors to whom correspondence should be addressed: [email protected]; [email protected]; and [email protected]
Appl. Phys. Rev. 8, 031408 (2021)
Article history
Received:
April 12 2021
Accepted:
July 13 2021
Citation
Zhengjie Huang, Shai R. Vardeny, Tonghui Wang, Zeeshan Ahmad, Ashish Chanana, Eric Vetter, Shijia Yang, Xiaojie Liu, Giulia Galli, Aram Amassian, Z. Valy Vardeny, Dali Sun; Observation of spatially resolved Rashba states on the surface of CH3NH3PbBr3 single crystals. Appl. Phys. Rev. 1 September 2021; 8 (3): 031408. https://doi.org/10.1063/5.0053884
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