Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells

Liu, Xiaojie; Chanana, Ashish; Huynh, Uyen; Xue, Fei; Haney, Paul; Blair, Steve; Jiang, Xiaomei; Vardeny, Z. V.

doi:10.1038/s41467-019-14073-6

Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells

Journal Article · Thu Jan 16 00:00:00 EST 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-14073-6· OSTI ID:1619767

Liu, Xiaojie; Chanana, Ashish; Huynh, Uyen; ; Haney, Paul; Blair, Steve; Jiang, Xiaomei; Vardeny, Z. V.

Abstract

The two-dimensional (2D) Ruddlesden−Popper organic-inorganic halide perovskites such as (2D)-phenethylammonium lead iodide (2D-PEPI) have layered structure that resembles multiple quantum wells (MQW). The heavy atoms in 2D-PEPI contribute a large spin-orbit coupling that influences the electronic band structure. Upon breaking the inversion symmetry, a spin splitting (‘Rashba splitting’) occurs in the electronic bands. We have studied the spin splitting in 2D-PEPI single crystals using the circular photogalvanic effect (CPGE). We confirm the existence of Rashba splitting at the electronic band extrema of 35±10 meV, and identify the main inversion symmetry breaking direction perpendicular to the MQW planes. The CPGE action spectrum above the bandgap reveals spin-polarized photocurrent generated by ultrafast relaxation of excited photocarriers separated in momentum space. Whereas the helicity dependent photocurrent with below-gap excitation is due to spin-galvanic effect of the ionized spin-polarized excitons, where spin polarization occurs in the spin-split bands due to asymmetric spin-flip.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE); Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0014579

OSTI ID:: 1619767

Alternate ID(s):: OSTI ID: 1624238

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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