Organic-to-inorganic structural chirality transfer in a 2D hybrid perovskite and impact on Rashba-Dresselhaus spin-orbit coupling

Manoj K. Jana, Ruyi Song, Haoliang Liu, Dipak Raj Khanal, Svenja M. Janke, Rundong Zhao, Chi Liu, Z. Valy Vardeny, Volker Blum and David B. Mitzi ()
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Manoj K. Jana: Duke University
Ruyi Song: Duke University
Haoliang Liu: University of Utah
Dipak Raj Khanal: University of Utah
Svenja M. Janke: Duke University
Rundong Zhao: Duke University
Chi Liu: Duke University
Z. Valy Vardeny: University of Utah
Volker Blum: Duke University
David B. Mitzi: Duke University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Translation of chirality and asymmetry across structural motifs and length scales plays a fundamental role in nature, enabling unique functionalities in contexts ranging from biological systems to synthetic materials. Here, we introduce a structural chirality transfer across the organic–inorganic interface in two-dimensional hybrid perovskites using appropriate chiral organic cations. The preferred molecular configuration of the chiral spacer cations, R-(+)- or S-(−)-1-(1-naphthyl)ethylammonium and their asymmetric hydrogen-bonding interactions with lead bromide-based layers cause symmetry-breaking helical distortions in the inorganic layers, otherwise absent when employing a racemic mixture of organic spacers. First-principles modeling predicts a substantial bulk Rashba-Dresselhaus spin-splitting in the inorganic-derived conduction band with opposite spin textures between R- and S-hybrids due to the broken inversion symmetry and strong spin-orbit coupling. The ability to break symmetry using chirality transfer from one structural unit to another provides a synthetic design paradigm for emergent properties, including Rashba-Dresselhaus spin-polarization for hybrid perovskite spintronics and related applications.

Date: 2020
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DOI: 10.1038/s41467-020-18485-7

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