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By using the nonequilibrium Green’s function technique, the charge and spin transport properties through an A-B interferometer that has a parallel-coupled double-quantum-dot molecule embedded in each arm, (named as parallel-coupled double-quantum-dot molecule A-B interferometer) are investigated. In the absence of magnetic flux, as compared with the A-B interferometer with two quantum dots embedded in each arm, electron tunnelling becomes far easier for parallel-coupled double-quantum-dot molecule A-B interferometer. When the magnetic field is introduced, one can observe in the conductance spectrum one Fano resonance and one anti-resonance, both of which will die away simultaneously when the magnetic flux takes a proper value. Besides, spin transport can be manipulated by tuning the bias voltage between the two leads, magnetic flux, and Rashba spin orbit interaction.
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Keywords:
- nonequilibrium Green’ /
- s function /
- quantum dot /
- A-B interferometer
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[10] Chang B, Wang Q, Xie H, Liang J Q 2011 Phys. Lett. A 375 2932
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[17] Kobayashi K, Aikawa H, Katsumoto S, Iye Y 2002 Phys. Rev. Lett. 88 256806
[18] Ladron de Guevara M L, Claro F, Orellana P A 2003 Phys. Rev. B 67 195335
[19] Sun Q F, Wang J, Guo H 2005 Phys. Rev. B 71 165310
[20] Feng Chi, Jin-Long Liu, Lian-Liang Sun 2007 J. Appl. Phys. 101 093704
[21] Li J, Liu Y, Ping J, Ye Y, Li X Q 2012 Acta Phys. Sin. 61 137202 (in Chinese) [栗军, 刘玉, 平婧, 叶银, 李新奇 2012 61 137202]
[22] Jauho A P, Wingreen N S, Meir Y 1994 Phys. Rev. B 50 5528
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[1] Donarini A, Begemann G, Grifoni M 2010 Phys. Rev. B 82 125451
[2] He Z L, L T Q 2012 Phys. Lett. A 376 2501
[3] Nishikawa Y, Crow D J G, Hewson A C 2012 Phys. Rev. B 86 125134
[4] Calvo H L, Classen L, Splettstoesser J, Wegewijs M R 2012 Phys. Rev. B 86 245308
[5] Yang X F, Liu Y S 2010 Nanoscale Res. Lett. 5 1228
[6] Gao e, Zhao H K 2010 Phys. Lett. A 374 770
[7] Lu H Z, L R, Zhu B F 2005 Phys. Rev. B 71 235320
[8] Li Y X, Choi H Y, Lee H W 2008 Phys. Lett. A 372 2073
[9] Hou T, Wu S Q, Bi A H, Yang F B, Chen J F, Fan M 2009 Chin. Phys. B 18 783
[10] Chang B, Wang Q, Xie H, Liang J Q 2011 Phys. Lett. A 375 2932
[11] Yang M, Ran X J, Cui Y, Wang R Q 2011 Chin. Phys. B 20 097201
[12] An X T, Mu H Y, Xian L F, Liu J J 2012 Acta Phys. Sin. 61 157201 (in Chinese) [安兴涛, 穆惠英, 咸立芬, 刘建军 2012 61 157201]
[13] Wang Q, Liu J, Tang N, Zeng H S 2011 Chin. Phys. B 20 020303
[14] Deng Y X, Yan X H, Tang N S 2006 Acta Phys. Sin. 55 2027 (in Chinese) [邓宇翔, 颜晓红, 唐娜斯 2006 55 2027]
[15] Wu L J, Han Y, Gong W J, Tan T Y 2011 Acta Phys. Sin. 60 107303 (in Chinese) [吴丽君, 韩宇, 公卫江, 谭天亚 2011 60 107303]
[16] Yacoby A, Heiblum M, Mahalu D, Shtrikman H 1995 Phys. Rev. Lett. 74 4047
[17] Kobayashi K, Aikawa H, Katsumoto S, Iye Y 2002 Phys. Rev. Lett. 88 256806
[18] Ladron de Guevara M L, Claro F, Orellana P A 2003 Phys. Rev. B 67 195335
[19] Sun Q F, Wang J, Guo H 2005 Phys. Rev. B 71 165310
[20] Feng Chi, Jin-Long Liu, Lian-Liang Sun 2007 J. Appl. Phys. 101 093704
[21] Li J, Liu Y, Ping J, Ye Y, Li X Q 2012 Acta Phys. Sin. 61 137202 (in Chinese) [栗军, 刘玉, 平婧, 叶银, 李新奇 2012 61 137202]
[22] Jauho A P, Wingreen N S, Meir Y 1994 Phys. Rev. B 50 5528
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