Spin Physics of Excitons in Colloidal Nanocrystals

Journal Article · Wed Aug 15 04:00:00 EDT 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S106378341808019X· OSTI ID:22771058

Golovatenko, A. A. ^[1]; Shornikova, E. V. ^[2]; Yakovlev, D. R. ^[1]

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1. Ioffe Institute (Russian Federation)
2. Technische Universität Dortmund, Experimentelle Physik 2 (Germany)

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.

• OSTI ID: 22771058
• Journal Information: Physics of the Solid State, Journal Name: Physics of the Solid State Journal Issue: 8 Vol. 60; ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
COMPARATIVE EVALUATIONS
DETECTION
EXCITONS
MAGNETIC FIELDS
NANOSTRUCTURES
PHOTOLUMINESCENCE
POLARIZATION
POLARONS
RECOMBINATION
SEMICONDUCTOR MATERIALS
SPIN
SURFACES