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题名: Spin states in semiconductor quantum dot with a single magnetic ion
作者: Li XJ;  Yang W;  Chang K;  Xia JB
发表日期: 2008
摘要: We investigate theoretically CdTe quantum dots containing a single Mn2+ impurity, including the sp-d exchange interaction between carriers and the magnetic ion and the short-range exchange interaction between electron and hole. We find anticrossing behaviors in the energy spectrum of the electron-hole (e-h) pair that arise from the interplay between exchange interactions and the magnetic field. In addition to the s-d exchange interaction, we find that other mechanisms inducing the anticrossings become important in the strong heavy hole-light hole (hh-lh) mixing regime. The transition strengths between the states with spin projection of Mn2+ ion S-z not equal -5/2 (S-z = -5/2) decrease (increase) with increasing magnetic fields due to the alignment of the Mn2+ spin. The spin splitting of the e-h pair states depends sensitively on the external magnetic and electric field, which reveals useful information about the spin orientation and position of the magnetic ion. Meanwhile, the manipulation of the position of the magnetic ion offers us a way to control the spin splitting of the carriers. (C) 2008 Elsevier B.V. All rights reserved.
KOS主题词: Quantum dot
刊名: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Li, XJ ; Yang, W ; Chang, K ; Xia, JB .Spin states in semiconductor quantum dot with a single magnetic ion ,PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES,2008 ,40(10): 3097-3106
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