Magnetotransport through an Aharonov－Bohm ring with parallel double quantum dots coupled to ferromagnetic leads

doi:10.1088/1674-1056/19/4/047202

中国物理B ›› 2010, Vol. 19 ›› Issue (4): 47202-047202.doi: 10.1088/1674-1056/19/4/047202

Magnetotransport through an Aharonov－Bohm ring with parallel double quantum dots coupled to ferromagnetic leads

吴绍全, 侯涛, 赵国平, 余万伦

College of Physics and Electronic Engineering, Sichuan Normal University,Chengdu 610068, China

收稿日期:2009-06-23 修回日期:2009-08-08 出版日期:2010-04-15 发布日期:2010-04-15
基金资助:
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).

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

Received:2009-06-23 Revised:2009-08-08 Online:2010-04-15 Published:2010-04-15
Supported by:
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).

摘要/Abstract

摘要： 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.

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.

Key words: Kondo effect, double quantum dots, Aharonov--Bohm ring, magnetoresistance

中图分类号: (Quantum dots)

73.63.Kv

72.20.My (Galvanomagnetic and other magnetotransport effects) 75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures)) 85.70.Kh (Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.) 85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)

吴绍全, 侯涛, 赵国平, 余万伦. Magnetotransport through an Aharonov－Bohm ring with parallel double quantum dots coupled to ferromagnetic leads[J]. 中国物理B, 2010, 19(4): 47202-047202.

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[J]. Chin. Phys. B, 2010, 19(4): 47202-047202.

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Magnetotransport through an Aharonov－Bohm ring with parallel double quantum dots coupled to ferromagnetic leads

Magnetotransport through an Aharonov－Bohm ring with parallel double quantum dots coupled to ferromagnetic leads

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