skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Spin Physics of Excitons in Colloidal Nanocrystals

Abstract

We present a review of spin-dependent properties of excitons in semiconductor colloidal nanocrystals. The photoluminescences (PL) properties of neutral and charged excitons (trions) are compared. The mechanisms and the polarization of radiative recombination of a “dark” (spin-forbidden) exciton that determines the low-temperature PL of colloidal nanocrystals are discussed in detail. The radiative recombination of a dark exciton becomes possible as a result of simultaneous flips of the surface spin and electron spin in a dark exciton that leads to admixture of bright exciton states. This recombination mechanism is effective in the case of a disordered state of the spin system and is suppressed if the polaron ferromagnetic state forms. The conditions and various mechanisms of formation of the spin polaron state and possibilities of its experimental detection are discussed. The experimental and theoretical studies of magnetic field-induced circular polarization of PL in ensembles of colloidal nanocrystals are reviewed.

Authors:
;  [1];  [2];  [1]
  1. Ioffe Institute (Russian Federation)
  2. Technische Universität Dortmund, Experimentelle Physik 2 (Germany)
Publication Date:
OSTI Identifier:
22771058
Resource Type:
Journal Article
Journal Name:
Physics of the Solid State
Additional Journal Information:
Journal Volume: 60; Journal Issue: 8; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7834
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; COMPARATIVE EVALUATIONS; DETECTION; EXCITONS; MAGNETIC FIELDS; NANOSTRUCTURES; PHOTOLUMINESCENCE; POLARIZATION; POLARONS; RECOMBINATION; SEMICONDUCTOR MATERIALS; SPIN; SURFACES

Citation Formats

Rodina, A. V., E-mail: anna.rodina@mail.ioffe.ru, Golovatenko, A. A., Shornikova, E. V., and Yakovlev, D. R. Spin Physics of Excitons in Colloidal Nanocrystals. United States: N. p., 2018. Web. doi:10.1134/S106378341808019X.
Rodina, A. V., E-mail: anna.rodina@mail.ioffe.ru, Golovatenko, A. A., Shornikova, E. V., & Yakovlev, D. R. Spin Physics of Excitons in Colloidal Nanocrystals. United States. doi:10.1134/S106378341808019X.
Rodina, A. V., E-mail: anna.rodina@mail.ioffe.ru, Golovatenko, A. A., Shornikova, E. V., and Yakovlev, D. R. Wed . "Spin Physics of Excitons in Colloidal Nanocrystals". United States. doi:10.1134/S106378341808019X.
@article{osti_22771058,
title = {Spin Physics of Excitons in Colloidal Nanocrystals},
author = {Rodina, A. V., E-mail: anna.rodina@mail.ioffe.ru and Golovatenko, A. A. and Shornikova, E. V. and Yakovlev, D. R.},
abstractNote = {We present a review of spin-dependent properties of excitons in semiconductor colloidal nanocrystals. The photoluminescences (PL) properties of neutral and charged excitons (trions) are compared. The mechanisms and the polarization of radiative recombination of a “dark” (spin-forbidden) exciton that determines the low-temperature PL of colloidal nanocrystals are discussed in detail. The radiative recombination of a dark exciton becomes possible as a result of simultaneous flips of the surface spin and electron spin in a dark exciton that leads to admixture of bright exciton states. This recombination mechanism is effective in the case of a disordered state of the spin system and is suppressed if the polaron ferromagnetic state forms. The conditions and various mechanisms of formation of the spin polaron state and possibilities of its experimental detection are discussed. The experimental and theoretical studies of magnetic field-induced circular polarization of PL in ensembles of colloidal nanocrystals are reviewed.},
doi = {10.1134/S106378341808019X},
journal = {Physics of the Solid State},
issn = {1063-7834},
number = 8,
volume = 60,
place = {United States},
year = {2018},
month = {8}
}