Strong Rashba-Dresselhaus Effect in Nonchiral 2D Ruddlesden-Popper Perovskites
Journal Article
·
· Advanced Optical Materials
- University of Georgia, Athens, GA (United States); OSTI
- University of Utah, Salt Lake City, UT (United States)
- University of Georgia, Athens, GA (United States)
- University Ha Dong, Hanoi (Vietnam)
- Hanoi University of Science and Technology, Hanoi (Vietnam)
- Georgia Institute of Technology, Atlanta, GA (United States)
Chirality transfer from organic chiral molecules to lead halides is theorized as the origin of the strong Rashba-Dresselhaus effect causing large circular dichroism (CD) and circularly polarized luminescence (CPL) in metal halide perovskites (MHPs). In this report a concrete empirical evidence is provided that such strong CD and CPL can occur even in nonchiral 2D Ruddlesden-Popper perovskites (RPPs) (BA)2(MA)n-1PbnI3n+1 (where MA = CH3NH3 and BA = CH3(CH2)3NH3). The CD and CPL responses occurring at the excitonic transition of the MHPs are strongest (≈100 mdeg and 4.8%, respectively) when a single lead halide octahedral [PbI6]4- layer is repeatedly stacked between two nonchiral molecules BA+ (n = 1). However, they are rapidly quenched as n increases. It is hypothesized that strong Rashba-Dresselhaus splitting in the 2D RPPs originates the strong CD and CPL signatures. Density functional theory calculations reveal that the large interlayer distortions in the inorganic layers at the organic/inorganic interface give rise to the strong Rashba-Dresselhaus splitting. A Rashba-Dresselhaus field of ≈600 and ≈50 mT for n = 1 and 2, respectively, is estimated by magnetic circular dichroism spectroscopy. The studies may have significant impact on designing 2D RPPs with large Rashba-Dresselhaus effects at room temperature for spintronic applications.
- Research Organization:
- University of Georgia, Athens, GA (United States); University of Utah, Salt Lake City, UT (United States)
- Sponsoring Organization:
- Stylenquaza LLC.DBA Vicostone USA; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); Vingroup Innovation Foundation (VINIF)
- Grant/Contract Number:
- SC0019041
- OSTI ID:
- 1976228
- Alternate ID(s):
- OSTI ID: 1826805
- Journal Information:
- Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 1 Vol. 10; ISSN 2195-1071
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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