给出了具有椭球边界量子棒经过坐标变换成球形边界的哈密顿量.采用线性组合算符和幺正变换的方法研究了在非均匀抛物限制势下量子棒中强耦合磁极化子的性质.导出了量子棒中强耦合磁极化子的振动频率和声子平均数随磁场的回旋频率、电子-声子耦合强度、椭球的纵横比和横向和纵向有效受限长度的变化关系.结果表明:振动频率和声子平均数随电子-声子耦合强度和磁场的回旋频率的增加而增加,随横向和纵向有效受限长度的减小而迅速增大.当e'>1时,振动频率和声子平均数随椭球的纵横比增加而增加. e'<1时,随着椭球的纵横比减少,振动频率和声子平均数都增大.当e'=1时,振动频率和声子平均数取极小值.
参考文献
[1] | Katz D,Wizansky T,et al.Size-dependent tunneling and optical spectroscopy of CdSe quantum rods[J].Phys.Rev.Lett.,2002,89(8):086801-1-4. |
[2] | Bruchez M,Moronne M,Gin P,et al.Semiconductor nanocrystals as fluorescent biological labels[J].Science,1998,281:2013-2016. |
[3] | Klimov V I,Mikhailovsky A A,et al.Optical gain and stimulated emission in nanocrystal quantum dots[J].Science,2000,290:314-317. |
[4] | Sek G,Podemski P,Misiewicz J,et al.Photoluminescence from a single InGaAs epitaxial quantum rod[J].Appl.Phys.Lett.,2008,92(2):021901-1. |
[5] | Hu J T,Li L S,Yang W D,et al.Linearly polarized emission from colloidal semiconductor quantum rods[J].Science,2001,292:2060-2063. |
[6] | Kan S H,Mokari T,Rothenberg E,et al.Synthesis and size-dependent properties of zinc-blende semiconductor quantum rods[J].Nature Materials,2003,2:155-158. |
[7] | Shweky I,Aharoni A,Mokari T,et al.Seeded growth of InP quantum rods using indium acetate and myristic acid[J].Materials Science and Engineering C 2006,26:788-794. |
[8] | Li X Z,Xia J B.Electronic structure and optical properties of quantum rods[J].Phys.Rev.B,2002,66(11):115316-1-6. |
[9] | Li X Z,Xia J B.Effects of electric field on the electronic structure and optical properties of quantum rods with wurtzite structure[J].Phys.Rev.B,2003,68(16):165316-1-7. |
[10] | Li J B,Wang L W.High energy excitations in CdSe quantum rods[J].Nano.Lett.,2003,3:101-105. |
[11] | Li J B,Wang L W.Electronic structure of InP quantum rods:differences between wurtzite zinc blende and different orientations[J].Nano.Lett.,2004,4:29-33. |
[12] | Comas F,Studart N,Marques G E.Optical phonons in CdSe quantum rods[J].Solid State Commun.,2004,130:477-480. |
[13] | Zhang X W,Xia J B.Linear-polarization optical property of CdSe quantum rods[J].Chinese Journal of Semiconductors (半导体学报),2006,27(12):2094-2100(in Chinese). |
[14] | Zhang X W,Zhu Y H,Xia J B.Optical properties and g factors of GaAs quantum rods[J].Physica E,2006,33:376-380. |
[15] | Hu Y G,Yin J W,Xiao J L.Average number of optical phonons of weak-coupling impurity bound magnetopolaron in a parabolic quantum dot[J].Chinese Journal of Quantum Electronics(量子电子学报),2009,26(5):636-640(in Chinese). |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%