| 磁场和杂质对激子低能谱的效应 |
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| 引用本文： | 刘益民,黄钢明,鲍诚光. 磁场和杂质对激子低能谱的效应[J]. 中山大学学报(自然科学版), 2005, 44(5): 30-33 |
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| 作者姓名： | 刘益民 黄钢明 鲍诚光 |
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| 作者单位： | 1. 韶关学院物理学系,广东,韶关,512005
2. 中山大学物理学系,广东,广州,510275 |
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| 基金项目： | 国家自然科学基金，国家自然科学基金 |
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| 摘 要： | 探讨了磁场B和杂质对二维激子低态能谱的效应.杂质被固定在z轴上且与激子所在的平面的距离为d.用直接对角化方法获得了激子低态能量E随B和d的演化.当d一定时,对于中性杂质(或者无杂质) 和带正电杂质,E随B的增加而增加.而对于带负电杂质,激子的角动量L等于0时,能量E曲线上升;L等于1、2、3时,能量E曲线先下降后上升.当B一定时,对于带电杂质,E先随d增加而急剧增加,后随d增加而几乎不变.
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| 关 键 词： | 激子 磁场 杂质 能谱 |
| 文章编号： | 0529-6579(2005)05-0030-04 |
| 收稿时间： | 2005-01-12 |
| 修稿时间： | 2005-01-12 |
Effect of a Magnetic Field and an Impurity on the Low-lying Energy Spectra of an Exciton |
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| LIU Yi-min,HUANG Gang-ming,BAO Cheng-guang. Effect of a Magnetic Field and an Impurity on the Low-lying Energy Spectra of an Exciton[J]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2005, 44(5): 30-33 |
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| Authors: | LIU Yi-min HUANG Gang-ming BAO Cheng-guang |
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| Affiliation: | 1. Department of Physics, Shaoguan College, Shaoguan 512005, China; 2.Department of Physics, Sun Yat-sen University, Guangzhou 510275, China |
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| Abstract: | Effect of a magnetic field B and an impurity on the low-lying energy spectra of a two-dimensional exciton is studied. The impurity is located at the z-axis by a distance d from the plane of the exciton. The evolution of the low-lying energy E of the exciton in accord with B and d is obtained by exact diagonalization. When d is fixed, the increase of B leads to an increase of E in the cases of a neutral impurity (i.e. the impurity is absent) and a positive impurity. For a negative impurity, the increase of B leads to a monotone increase of E if angular momentum L is equal to 0. However, it leads firstly to a decrease when B is smaller and then an increase when B is larger if L is equal to 1, 2 and 3. When B is fixed, E increases rapidly at first and then is almost unchanged with the increase of d. |
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| Keywords: | exciton magnetic field impurity spectra |
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