Spin Physics of Excitons in Colloidal Nanocrystals

被引：10

作者：

Rodina, A. V. ^{[1
]}

Golovatenko, A. A. ^{[1
]}

Shornikova, E. V. ^{[2
,3
]}

Yakovlev, D. R. ^{[1
,2
]}

机构：

[1] Ioffe Inst, St Petersburg 194021, Russia

[2] Tech Univ Dortmund, Expt Phys 2, Dortmund, Germany

[3] Russian Acad Sci, Siberian Branch, Rzhanov Inst Semicond Phys, Novosibirsk 630090, Russia

来源：

PHYSICS OF THE SOLID STATE | 2018年 / 60卷 / 08期

基金：

俄罗斯基础研究基金会;

关键词：

CDSE QUANTUM DOTS; BAND-EDGE EXCITON; DYNAMIC SELF-POLARIZATION; DANGLING-BOND SPINS; FINE-STRUCTURE; RECOMBINATION DYNAMICS; MAGNETIC POLARONS; EXCHANGE INTERACTION; RADIATIVE DECAY; SIZE DEPENDENCE;

D O I：

10.1134/S106378341808019X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页码：1537 / 1553

页数：17

共 117 条

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