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从理论上研究了串型耦合双量子点之间库仑作用对其近藤共振的影响. 采用非平衡态格林函数和奴役玻色子平均场近似方法求解了系统的哈密顿量; 计算了系统电子的态密度、透射率、占居数和近藤温度随双量子点之间库仑作用能的变化, 同时也计算了电极处于极化时双量子点之间库仑作用能对系统电子态密度的影响. 结果表明,双量子点之间库仑作用能够极大地影响系统的基态物理性质. 同时还对相关的物理问题进行了讨论.
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关键词:
- 双量子点之间库仑作用 /
- 近藤共振 /
- 透射率 /
- 奴役玻色子平均场近似
We theoretically investigate the effect of the interdot coulomb interaction on Kondo resonance in series-coupled double quantum dots. The Anderson Hamiltonian of our system is solved by means of the slave-boson mean-field approximation, and the variations of the density of states, the transmission probability, the occupation number and the Kondo temperature with interdot Coulomb interaction are discussed in the Kondo regime, and the densities of states are calculated in the Kondo regime for various interdot Coulomb repulsions with parallel and antiparallel lead-polarization alignments. Our results reveal that the interdot Coulomb interaction between quantum dots greatly influences the physical property of this system, and relevant underlying physics of this problem is discussed.-
Keywords:
- interdot Coulomb interaction /
- Kondo resonance /
- transmission probability /
- slave-boson mean-field approximation
[1] Ono K, Austing D G, Tokura Y, Tarucha S 2002 Science 297 1313
[2] [3] [4] Van der Wiel W G, De Franceschi S, Elzerman J M, Fujisawa T, Tarucha S, Kouwenhoven L P 2003 Rev. Mod. Phys. 75 1
[5] Hanson R, Kouwenhoven L P, Petta J R, Tarucha S, Vandersypen L M K 2007 Rev. Mod. Phys. 79 1217
[6] [7] [8] Wang Z Q 2002 Acta Phys. Sin. 51 1808 (in Chinese) [汪仲清 2002 51 1808]
[9] [10] Hofstetter W, Knig J, Scheller H 2001 Phys. Rev. Lett. 87 156803
[11] [12] Tanaka Y, Kawakami N 2004 J. Phys. Soc. Jpn. 73 2795
[13] Tanaka Y, Kawakami N 2005 Phys. Rev. B 72 085304
[14] [15] Georges A, Meir Y 1999 Phys. Rev. Lett. 82 3508
[16] [17] Ji Y H, Rao J P, Lei M S 2002 Acta Phys. Sin. 51 395 (in Chinese) [嵇英华, 饶建平, 雷敏生 2002 51 395]
[18] [19] Long C Y, Liu B, Wang X F 2002 Acta Phys. Sin. 51 195 (in Chinese) [龙超云, 刘波, 王心福 2002 51 195]
[20] [21] [22] Takazawa Y, Imai Y, Kawakami N 2002 J. Phys. Soc. Jpn. 71 2234
[23] Wang Z C 2003 Acta Phys. Sin. 52 2874 (in Chinese) [王忠纯 2003 52 2874]
[24] [25] Tomosuke A, Mikio E 2001 Phys. Rev. B 63 125327
[26] [27] Pohjola T, Knig J, Salomaa M M, Schmid J, Schoeller H, Schn G 1997 Europhys. Lett. 40 189
[28] [29] Hewson A C 1993 The Kondo Problem to Heavy Fermions (Cambridge: Cambridge University Press)
[30] [31] Wu S Q, Chen X W, Sun W L, Wang S J 2004 Acta Phys. Sin. 53 2336 (in Chinese) [吴绍全, 谌雄文, 孙威立, 王顺金 2004 53 2336]
[32] [33] Wu S Q, He Z, Yan C H, Sun W L, Wang S J 2006 Acta Phys. Sin. 55 1413 (in Chinese) [吴绍全, 何忠, 阎从华, 孙威立, 王顺金 2006 55 1413]
[34] [35] Wu S Q 2009 Acta Phys. Sin. 58 4175 (in Chinese) [吴绍全 2009 58 4175]
[36] [37] [38] Rui S, Norio K 2005 Phys. Rev. B 72 085303
[39] [40] Borda L, Zarand G, Hofstetter W, Halperin B I, Von Delft J 2003 Phys. Rev. Lett. 90 026602
[41] Ye J F, Ye F, Ding G H 2003 Acta Phys. Sin. 52 468 (in Chinese) [叶剑斐, 叶飞, 丁国辉 2003 52 468]
[42] [43] [44] Wilhelm U, Weis J 2000 Physica E 6 668
[45] Sun Q F, Guo H 2002 Phys. Rev. B 66 155308
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[1] Ono K, Austing D G, Tokura Y, Tarucha S 2002 Science 297 1313
[2] [3] [4] Van der Wiel W G, De Franceschi S, Elzerman J M, Fujisawa T, Tarucha S, Kouwenhoven L P 2003 Rev. Mod. Phys. 75 1
[5] Hanson R, Kouwenhoven L P, Petta J R, Tarucha S, Vandersypen L M K 2007 Rev. Mod. Phys. 79 1217
[6] [7] [8] Wang Z Q 2002 Acta Phys. Sin. 51 1808 (in Chinese) [汪仲清 2002 51 1808]
[9] [10] Hofstetter W, Knig J, Scheller H 2001 Phys. Rev. Lett. 87 156803
[11] [12] Tanaka Y, Kawakami N 2004 J. Phys. Soc. Jpn. 73 2795
[13] Tanaka Y, Kawakami N 2005 Phys. Rev. B 72 085304
[14] [15] Georges A, Meir Y 1999 Phys. Rev. Lett. 82 3508
[16] [17] Ji Y H, Rao J P, Lei M S 2002 Acta Phys. Sin. 51 395 (in Chinese) [嵇英华, 饶建平, 雷敏生 2002 51 395]
[18] [19] Long C Y, Liu B, Wang X F 2002 Acta Phys. Sin. 51 195 (in Chinese) [龙超云, 刘波, 王心福 2002 51 195]
[20] [21] [22] Takazawa Y, Imai Y, Kawakami N 2002 J. Phys. Soc. Jpn. 71 2234
[23] Wang Z C 2003 Acta Phys. Sin. 52 2874 (in Chinese) [王忠纯 2003 52 2874]
[24] [25] Tomosuke A, Mikio E 2001 Phys. Rev. B 63 125327
[26] [27] Pohjola T, Knig J, Salomaa M M, Schmid J, Schoeller H, Schn G 1997 Europhys. Lett. 40 189
[28] [29] Hewson A C 1993 The Kondo Problem to Heavy Fermions (Cambridge: Cambridge University Press)
[30] [31] Wu S Q, Chen X W, Sun W L, Wang S J 2004 Acta Phys. Sin. 53 2336 (in Chinese) [吴绍全, 谌雄文, 孙威立, 王顺金 2004 53 2336]
[32] [33] Wu S Q, He Z, Yan C H, Sun W L, Wang S J 2006 Acta Phys. Sin. 55 1413 (in Chinese) [吴绍全, 何忠, 阎从华, 孙威立, 王顺金 2006 55 1413]
[34] [35] Wu S Q 2009 Acta Phys. Sin. 58 4175 (in Chinese) [吴绍全 2009 58 4175]
[36] [37] [38] Rui S, Norio K 2005 Phys. Rev. B 72 085303
[39] [40] Borda L, Zarand G, Hofstetter W, Halperin B I, Von Delft J 2003 Phys. Rev. Lett. 90 026602
[41] Ye J F, Ye F, Ding G H 2003 Acta Phys. Sin. 52 468 (in Chinese) [叶剑斐, 叶飞, 丁国辉 2003 52 468]
[42] [43] [44] Wilhelm U, Weis J 2000 Physica E 6 668
[45] Sun Q F, Guo H 2002 Phys. Rev. B 66 155308
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