Effect of an impurity on 3-electron quantum dots in magnetic fields  

作　　者：LIU Yimin1,2, HUANG Gangming1 & BAO Chengguang1 1. Department of Physics, Zhongshan University, Guangzhou 510275, China 2. Department of Physics, Shaoguan University, Shaoguan 512005, China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2004年第5期521-530,共10页中国科学：物理学、力学、天文学（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.10174098 and 10374119);by the Doctorate Foundation of the Ministry of Education of China.

摘　　要：The ground-state property of a 2-dimensional 3-electron quantum dot (QD) subjected to an external magnetic fieldB and affected by an impurity is studied. The impurity is located at thez-axis by a distanced from the plane of the dot. The evolution of the angular momentumL o and the spinS o of the ground state in accordance withB andd has been calculated, and the results are summarized and plotted in a (L o,S o) diagram. The spatial distribution of the electrons (the size and the geometric features) and the optical absorption have also been investigated. The (L o S o) diagram indicates thatL o andS o may jump whend and/orB vary. It was found that, due to the constraints arising from symmetry, each symmetric geometry is accessible only to a specific group of states having specificL o andS o.The ground-state property of a 2-dimensional 3-electron quantum dot (QD) subjected to an external magnetic field B and affected by an impurity is studied. The impurity is located at the z-axis by a distance d from the plane of the dot. The evolution of the angular momentum L0 and the spin S0 of the ground state in accordance with B and d has been calculated, and the results are summarized and plotted in a (L0, S0) diagram. The spatial distribution of the electrons (the size and the geometric features) and the optical absorption have also been investigated. The (L0, S0) diagram indicates that L0 and S0 may jump when d and/or B vary. It was found that, due to the constraints arising from symmetry, each symmetric geometry is accessible only to a specific group of states having specific L0 and S0.

关 键 词：quantum dot  ground state  CHARGED impurity  magnetic field. 

分 类 号：O413[理学—理论物理]