Probing Permanent Dipole Moments and Removing Exciton Fine Structures in Single Perovskite Nanocrystals by an Electric Field

Bihu Lv, Tianyuan Zhu, Ying Tang, Yan Lv, Chunfeng Zhang, Xiaoyong Wang, Dajun Shu, and Min Xiao
Phys. Rev. Lett. 126, 197403 – Published 10 May 2021
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Abstract

Single perovskite nanocrystals have emerged as a novel type of semiconductor nanostructure capable of emitting single photons with rich exciton species and fine energy-level structures. Here we focus on single excitons and biexcitons in single perovskite CsPbI3 nanocrystals to show, for the first time, how their optical properties are modulated by an external electric field at the cryogenic temperature. The electric field can cause a blueshift in the photoluminescence peak of single excitons, from which the existence of a permanent dipole moment can be deduced. Meanwhile, the fine energy-level structures of single excitons and biexcitons in a single CsPbI3 nanocrystal can be simultaneously eliminated, thus preparing a potent platform for the potential generation of polarization-entangled photon pairs.

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  • Received 7 May 2020
  • Revised 27 September 2020
  • Accepted 8 April 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.197403

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Bihu Lv1,*, Tianyuan Zhu1,*, Ying Tang1,*, Yan Lv1, Chunfeng Zhang1, Xiaoyong Wang1,†, Dajun Shu1,‡, and Min Xiao1,2,§

  • 1National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 2Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA

  • *These authors contributed equally to this work.
  • Corresponding author. wxiaoyong@nju.edu.cn
  • Corresponding author. djshu@nju.edu.cn
  • §Corresponding author. mxiao@uark.edu

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Issue

Vol. 126, Iss. 19 — 14 May 2021

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