CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetotransport through an Aharonov-Bohm ring with parallel double quantum dots coupled to ferromagnetic leads |
Wu Shao-Quan(吴绍全)†, Hou Tao(侯涛), Zhao Guo-Ping(赵国平), and Yu Wan-Lun(余万伦) |
College of Physics and Electronic Engineering, Sichuan Normal University,Chengdu 610068, China |
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Abstract Using the Keldysh nonequilibrium Green function and equation-of-motion technique, this paper studies the magnetotransport through an Aharonov--Bohm (AB) ring with parallel double quantum dots coupled to ferromagnetic leads. It calculates the transmission probability in both the equilibrium and the nonequilibrium case, analyses the conductance and the tunnel magnetoresistance for various parameters, and obtains some new results. These results show that this system is provided with an excellent spin filtering property, and that a large tunnelling magnetoresistance and a negative tunnelling magnetoresistance can arise by adjusting relative parameters; these facts indicate that this system is a possible candidate for spin valve transistors, and has important applications in spintronics.
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Received: 23 June 2009
Revised: 08 August 2009
Accepted manuscript online:
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PACS:
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73.63.Kv
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(Quantum dots)
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72.20.My
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(Galvanomagnetic and other magnetotransport effects)
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75.70.Cn
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(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
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85.70.Kh
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(Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.)
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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Fund: Project supported by the Scientific
Research Fund of the Education Department of Sichuan Province of
China (Grant No.~2006A069) and Funds for Major Basic Research
Project of Sichuan Province of China (Grant No.~2006J13-155). |
Cite this article:
Wu Shao-Quan(吴绍全), Hou Tao(侯涛), Zhao Guo-Ping(赵国平), and Yu Wan-Lun(余万伦) Magnetotransport through an Aharonov-Bohm ring with parallel double quantum dots coupled to ferromagnetic leads 2010 Chin. Phys. B 19 047202
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