Hydrostatic pressure and magnetic field effects on donor states in pyramidal quantum dots

被引：13
作者：
Tiriba, G. C. [1 ]
Niculescu, E. C. [1 ]
Burileanu, L. M. [1 ]
机构：
[1] Univ Politehn Bucuresti, Dept Phys, RO-060042 Bucharest, Romania
来源：
SUPERLATTICES AND MICROSTRUCTURES | 2014年 / 75卷
关键词：
Quantum dot; Hydrogen like impurity; Diamagnetic shift; Magnetic field; Hydrostatic pressure; PHOTOIONIZATION CROSS-SECTION; BINDING-ENERGY; IMPURITY STATES; ELECTRIC-FIELD; HYDROGENIC IMPURITY; DROPLET EPITAXY; SHALLOW DONOR; THICKNESS; SPECTRA;
D O I：
10.1016/j.spmi.2014.09.010
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The simultaneous effects of the hydrostatic pressure and magnetic field on the ground state of impurity confined by a GaAs pyramid-shaped QD are investigated within the effective mass approximation. By using a variational method, the binding energy and the extent of the electron wavefunction in the structure are examined for different dot sizes and impurity positions. The influence of above mentioned parameters on the diamagnetic shift of the impurity energy is also discussed. We found that the diamagnetic coefficient could be appreciably tuned by a proper tailoring of the heterostructure parameters (dot size, impurity position) as well as by changing the hydrostatic pressure and/or the magnetic field strength. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：749 / 760
页数：12
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