Author(s): Do, TTH (Do, T. Thu Ha); del Aguila, AG (del Aguila, Andres Granados); Zhang, D (Zhang, Dong); Xing, J (Xing, Jun); Liu, S (Liu, Sheng); Prosnikov, MA (Prosnikov, M. A.); Gao, WB (Gao, Weibo); Chang, K (Chang, Kai); Christianen, PCM (Christianen, Peter C. M.); Xiong, QH (Xiong, Qihua)

Source: NANO LETTERS Volume: 20 Issue: 7 Pages: 5141-5148 DOI: 10.1021/acs.nanolett.0c01364 Published: JUL 8 2020

Abstract: The fast-growing field of atomically thin semiconductors urges a new understanding of two-dimensional excitons, which entirely determine their optical responses. Here, taking layered lead halide perovskites as an example of unconventional two-dimensional semiconductors, by means of versatile optical spectroscopy measurements, we resolve fine-structure splitting of bright excitons of up to similar to 2 meV, which is among the largest values in two-dimensional semiconducting systems. The large fine-structure splitting is attributed to the strong electron-hole exchange interaction in layered perovskites, which is proven by the optical emission in high magnetic fields of up to 30 T. Furthermore, we determine the g-factors for these bright excitons as similar to+1.8. Our findings suggest layered lead halide perovskites are an ideal platform for studying exciton spin-physics in atomically thin semiconductors that will pave the way toward exciton manipulation for novel device applications.

Accession Number: WOS:000548893200059

PubMed ID: 32459491

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Zhang, Dong         R-9989-2017         0000-0002-4227-665X

gao, weibo         F-9408-2017         0000-0003-3971-621X

ISSN: 1530-6984

eISSN: 1530-6992

Full Text: https://pubs.acs.org/doi/10.1021/acs.nanolett.0c01364