采用Tokuda修正的线性组合算符和幺正变换方法,研究了非对称量子点中弱耦合束缚磁极化子的性质.推导出了磁极化子基态能量随量子点横向、纵向受限长度和磁场的变化关系.进行了数值计算,计算结果表明:考虑自旋影响时,束缚磁极化子基态能量分裂成自旋向上(向下)两个分支.并且磁极化子基态能量、自旋向上(向下)分裂能随量子点横向、纵向受限长度的增加而减少,随磁场强度的增加而增大.
The properties of bound magnetopolaron,which is weakly coupled to LO-phonon in an asymmetric quantum dot (QD) were studied by using Tokuda modified linear combination operator and unitary transformation methods.The expression of ground-state energy as functions of the transverse and longitudinal confinement lengths and magnetic field was derived.After a simple numerical calculation,it's found that the ground-state energy of bound magnetopolaron splits into two branches after taking the spin influence into account.The ground-state energy and spin-up(down) splitting energy decrease with increasing the transverse and longitudinal confinement lengths,and they axe increasing functions of magnetic field.
参考文献
| [1] | Liang X T.Non-Markovian dynamics and phonon decoherence of a double quantum dot charge qubit[J].Phys.Rev.B,2005,72:245328-245332. |
| [2] | Stavrou V N,Hu X D.Charge decoherence in laterally coupled quantum dots due to electron-phonon interactions[J].Phys.Rev.B,2005,72:075362-075369. |
| [3] | Wu Z J,Zhu K D,Yuan X Z,et al.Charge qubit dynamics in a double quantum dot coupled to phonons[J].Phys.Rev.B,2005,71:205323-205329. |
| [4] | Kuroda K,Kuroda T,Watanabe K,et al.Final-state readout of exciton qubit by observing resonantly excited photoluminescence in quantum dots[J].Appl.Phys.Lett.,2007,90(5):051909-1-3. |
| [5] | Ladriére-Pioro M,Tokura Y,Obata T,et al.Micromagnets for coherent control of spin-charge qubit in lateral quantum dots[J].Appl.Phys.Lett.,2007,90(2):024105-1-3. |
| [6] | P(O)tz W.Control of the non-Markovian dynamics of a qubit[J].Appl.Phys.Lett.,2006,89(25):254102-1-3. |
| [7] | Eashba E I,Efros A L.Orbital mechanisms of electron-spin manipulation by an electric field[J].Phys.Rev.Lett.,2003,91:126405-126408. |
| [8] | Rokhinson L P.,Larkina V,Lyanda-Geller Y B,et al.Spin separation in cyclotron motion[J].Phys.Rev.Lett.,2004,93:146601-146604. |
| [9] | Hu L,Gao J,Shen S Q.Influence of spin transfer and contact resistance on measurement of the spin Hall effect[J].Phys.Rev.B,2003,68:115302-115309. |
| [10] | Kandemir B S,Cetin A.Thermal conductivity anisotropy in a ferromagnetic superconductor,UGe2[J].J.Phys.:Condens.Matter.,2005,17:667-679. |
| [11] | Gong L L,Xiao J L.Magnetic flux assisted spin accumulation in a quantum dot ring with Rashba spin-orbital interaction[J].Physica E,2009,41:1293-1296. |
| [12] | Liu J,Xiao J L,Huo S F,et al.Properties of a bound polaron under a perpendicular magnetic field[J].Comm.Theor.Phys.,2007,48:930-934. |
| [13] | Zhang H R,Xiao J L.Effective mass of strong-coupling bound polaron in a triangular quantum well induced by Rashba effect[J].Comm.Theor.Phys.,2008,50:995-998. |
| [14] | Zhang H R,Xiao J L.Effective mass of strong-coupling polaron in a triangular quantum well induced by Rashba effect[J].Physica B,2007,403:1933-1936. |
| [15] | Hu Y G,Yin J W,Xiao J L.Average number of optical phonons of weak-coupling impurity bound magnetopolaron ina parabolic quantum dot[J].Chinese Journal of Quantum Electronics(量子电子学报),2009,26(5):636-640 (inChinese). |
| [16] | Huybrechts W J.Internal excited state of the optical polaron[J].Phys.C:Solid State Phys.,1977,10:3761-3769. |
| [17] | Kartheuser E.Polaron in Ionic Crystal and Polar Semiconductor[M].Northe-Holland,Amsterdam,1972. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%