Optical orientation and alignment of excitons in ensembles of inorganic perovskite nanocrystals

  title={Optical orientation and alignment of excitons in ensembles of inorganic perovskite nanocrystals},
  author={Mikhail O. Nestoklon and Serguei V. Goupalov and R. I. Dzhioev and O. S. Ken and Vladimir L. Korenev and Yu. G. Kusrayev and V. F. Sapega and Chris de Weerd and Leyre Gomez and Tom Gregorkiewicz and Junhao Lin and Kazu Suenaga and Yasufumi Fujiwara and Lev B. Matyushkin and Irina N Yassievich},
  journal={Physical Review B},
We demonstrate the optical orientation and alignment of excitons in a two-dimensional layer of CsPbI3 perovskite nanocrystals prepared by colloidal synthesis and measure the anisotropic exchange splitting of exciton levels in the nanocrystals. From the experimental data at low temperature (2 K), we obtain the average value of anisotropic splitting of bright exciton states of the order of 120 μeV. Our calculations demonstrate that there is a significant contribution to the splitting due to the… 

Figures and Tables from this paper

Giant Fine Structure Splitting of the Bright Exciton in a Bulk MAPbBr3 Single Crystal.
This report reports on the first observation of the bright exciton fine structure splitting in a bulk semiconductor crystal, where the impact of quantum confinement can be specifically excluded, giving access to the intrinsic properties of the material.
Revealing the Exciton Fine Structure in Lead Halide Perovskite Nanocrystals
An overview of recent magneto-optical spectroscopic studies revealing the entire excitonic fine structure and relaxation mechanisms in perovskite NCs is given, which provides an explanation for their remarkably bright photoluminescence at low temperature although the ground exciton state is optically inactive.
Dielectric Confinement and Exciton Fine Structure in Lead Halide Perovskite Nanoplatelets
Owing to their flexible chemical synthesis and the ability to shape nanostructures, lead halide perovskites have emerged as high potential materials for optoelectronic devices. Here, we investigate
The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals
The exciton fine structure of individual cesium lead iodide perovskite nanocrystals is unveiled and it is demonstrated that it is governed by the electron-hole exchange interaction and nanocrystal shape anisotropy.
Transition from Doublet to Triplet Excitons in Single Perovskite Nanocrystals.
It is shown that the transition from doublet to triplet exciton peaks can be triggered in single CsPbI3 NCs from the same batch of samples upon being stored in the ambient environment, leading to enhanced Auger recombination and allowing us to extract the emission-energy dependence of the exciton energy-level fine structure.
Quantum Interference in a Single Perovskite Nanocrystal.
This stable demonstration of a coherent optical feature will advance single colloidal NCs into the quantum information regime, opening up an alternative yet prospective research direction beyond their traditional applications such as in optoelectronic devices and bioimaging.
Quasicubic model for metal halide perovskite nanocrystals.
An analytical quasicubic model is developed for the effect of tetragonal and orthorhombic lattice distortions on the exchange-related exciton fine structure in CsPbBr3 as well as some hybrid organic MHPs of recent interest, including formamidinium lead bromide and methylammonium lead iodide.
The ground exciton state of formamidinium lead bromide perovskite nanocrystals is a singlet dark state
Magneto-optical spectroscopy shows that the dark exciton state in single formamidinium lead bromide perovskite nanocrystals is located below the bright exciton triplet, which explains the intense brightness of the nanoparticles.
Ultrafast dynamics of photoexcited carriers in perovskite semiconductor nanocrystals
Abstract Perovskite semiconductor nanocrystals have emerged as a promising family of materials for optoelectronic applications including light-emitting diodes, lasers, light-to-electricity convertors
Coherent spin dynamics of electrons and holes in CsPbBr3 perovskite crystals
It is shown that elaborated time-resolved spectroscopy involving strong magnetic fields can be successfully used for perovskites and coherent spin dynamics of electrons and holes in cesium lead bromide perovkites are studied.


Bright-Exciton Fine-Structure Splittings in Single Perovskite Nanocrystals.
The above findings have prepared an efficient platform suitable for probing exciton and spin dynamics of semiconductor nanostructures at the visible-wavelength range, from which a variety of practical applications such as in entangled photon-pair source and quantum information processing can be envisioned.
Optical orientation and alignment of excitons in quantum dots
AbstractOptical orientation and alignment of excitons in InAlAs quantum dots in the AlGaAs matrix have been studied both theoretically and experimentally. Experiments performed in a longitudinal
The fine structure of excitonic levels in CdSe nanocrystals
The fine structure of the exciton ground level in a spherical nanocrystal of a zincblende or a wurtzite structure semiconductor was calculated with the inclusion of short-and long-range
Optical orientation of donor-bound excitons in nanosized InP/InGaP islands
Spin splitting of optically active and inactive excitons in nanosized n-InP/InGaP islands has been revealed. Optically inactive states become manifest in polarized-luminescence spectra as a result of
Fine structure of excitonic levels in quantum dots
The experimental results of a study of the fine structure of the levels of excitons localized in InAlAs quantum dots in an AlGaAs matrix are reported. Transformations from optical orientation to
Energy Transfer between Inorganic Perovskite Nanocrystals
Cesium lead halide nanocrystals are a new attractive material for optoelectronic applications since they combine the advantageous properties of perovskites and quantum dots. For future applications
Electrodynamical treatment of the electron-hole long-range exchange interaction in semiconductor nanocrystals
We show that the contribution to the fine structure of the ground exciton level in a semiconductor nanocrystal due to the long-range part of the electron-hole exchange interaction can be equivalently
Anisotropic exchange splitting of excitonic levels in small quantum systems
A theory of long-range exchange interaction between an electron and a hole in a zero-dimensional exciton has been developed taking into account the retardation effect. It has been shown that, for the
Direct Observation of Band Structure Modifications in Nanocrystals of CsPbBr3 Perovskite.
This work establishes an intimate relation between quantum dot size and even shape and its bandgap energy on a single object level and shows the presence of an effective coupling between proximal dots in an ensemble, leading to band structure modification.
Neutral and Charged Exciton Fine Structure in Single Lead Halide Perovskite Nanocrystals Revealed by Magneto-optical Spectroscopy.
The spectroscopic study of individual perovskite CsPbBr3 nanocrystals uses magneto-photoluminescence spectroscopy to determine their crystal structure and reveals the optical properties of charged excitons and allows the extraction of the electron and hole g-factors for perovkite systems.