Polaron and dielectric mismatch effects on impurity-related optical absorption and refractive index changes in a spherical quantum dot

被引：4
作者：
Vartanian, A. L. [1 ]
Asatryan, A. L. [1 ]
Vardanyan, L. A. [1 ]
机构：
[1] Yerevan State Univ, Dept Solid State Phys, 1 A Manoogian, Yerevan 0025, Armenia
来源：
SUPERLATTICES AND MICROSTRUCTURES | 2018年 / 113卷
关键词：
Polaron; Dielectric mismatch; Optical properties; Impurity; Quantum dot; Electric field; ELECTRIC-FIELD; IMAGE-CHARGE; BOUND POLARON; BINDING-ENERGY; POLARIZATION CHARGES; HYDROGENIC IMPURITY; TRANSITIONS; NANODOTS; WIRES; STATE;
D O I：
10.1016/j.spmi.2017.11.032
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The influence of both dielectric mismatch and electron-phonon interaction (EPI) effects on the linear and nonlinear optical properties of spherical quantum dots (QDs) with a shallow hydrogenic impurity under electric field are studied. The interplay among confinement geometry, dielectric mismatch, electron-phonon interaction, and the Stark effect on the oscillator strengths, absorption coefficients (ACs) and refractive index changes (RICs) has been revealed. The results show that the polaron effect and/or image charges lead to the blue shifts of absorption coefficients and refractive index changes. As a result of a quantum confinement Stark effect the red shifts of optical characteristics with increasing electric field have been observed. This indicates that the impurity-related optical characteristics of quantum dots can be controlled by the Stark confinement. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：442 / 458
页数：17
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