Impurity effects on the Aharonov-Bohm optical signatures of neutral quantum-ring magnetoexcitons

被引：55

作者：

da Silva, LGGVD ^{[1
]}

Ulloa, SE

Govorov, AO

机构：

[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil

[2] Ohio Univ, Dept Phys & Astron, Nanoscale & Quantum Phenomena Inst, Athens, OH 45701 USA

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 15期

基金：

巴西圣保罗研究基金会;

关键词：

D O I：

10.1103/PhysRevB.70.155318

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the role of impurity scattering on the photoluminescence (PL) emission of polarized magnetoexcitons. We consider systems where both the electron and hole are confined on a ring structure (quantum rings) as well as on a type-II quantum dot. Despite their neutral character, excitons exhibit strong modulation of energy and oscillator strength in the presence of magnetic fields. Scattering impurities enhance the PL intensity on otherwise "dark" magnetic field windows and nonzero PL emission appears for a wide magnetic field range even at zero temperature. For higher temperatures, impurity-induced anticrossings on the excitonic spectrum lead to unexpected peaks and valleys on the PL intensity as function of magnetic field. Such behavior is absent on ideal systems and can account for prominent features in recent experimental results.

引用

页码：155318 / 1

页数：7

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