Spin-dependent negative differential conductance in transport through single-molecule magnets

doi:10.1088/1674-1056/22/4/047201

Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (4): 47201-047201.doi: 10.1088/1674-1056/22/4/047201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Spin-dependent negative differential conductance in transport through single-molecule magnets

罗威, 王瑞强, 胡梁宾, 杨谋

Laboratory of Quantum Information Technology, ICMP and SPTE, South China Normal University, Guangzhou 510006, China

收稿日期:2012-09-11 修回日期:2012-10-18 出版日期:2013-03-01 发布日期:2013-03-01
基金资助:
Project supported by the Program for New Century Excellent Talents in University of China (Grant No. NCET-10-0090), the National Natural Science Foundation of China (Grant Nos. 10974058, 11174088, and 11274124), and the Guangdong Provincial Natural Science Foundation (Grant No. S2012010010681).

Spin-dependent negative differential conductance in transport through single-molecule magnets

Luo Wei (罗威), Wang Rui-Qiang (王瑞强), Hu Liang-Bin (胡梁宾), Yang Mou (杨谋)

Laboratory of Quantum Information Technology, ICMP and SPTE, South China Normal University, Guangzhou 510006, China

Received:2012-09-11 Revised:2012-10-18 Online:2013-03-01 Published:2013-03-01
Contact: Wang Rui-Qiang E-mail:rqwanggz@163.com
Supported by:
Project supported by the Program for New Century Excellent Talents in University of China (Grant No. NCET-10-0090), the National Natural Science Foundation of China (Grant Nos. 10974058, 11174088, and 11274124), and the Guangdong Provincial Natural Science Foundation (Grant No. S2012010010681).

摘要/Abstract

摘要： Transport properties are theoretically studied through an anisotropy single-molecule magnet symmetrically connected to two identical ferromagnetic leads. It is found that even though in parallel configuration of leads' magnetizations, the total current still greatly depends on the spin polarization of leads at certain particular bias region, and thus for large polarization a prominent negative differential conductance (NDC) emerges. This originates from the joint effect of single-direction transitions and spin polarization, which removes the symmetry between spin-up and spin-down transitions. The present mechanism of NDC is remarkably different from the previously reported mechanisms. To clarify the physics of the NDC, we further monitored the shot noise spectroscopy and found that the appearance of the NDC is accompanied by the rapid decrease of Fano factor.

关键词: spintronics, single-molecule magnets, negative differential conductance, shot noise

Abstract: Transport properties are theoretically studied through an anisotropy single-molecule magnet symmetrically connected to two identical ferromagnetic leads. It is found that even though in parallel configuration of leads' magnetizations, the total current still greatly depends on the spin polarization of leads at certain particular bias region, and thus for large polarization a prominent negative differential conductance (NDC) emerges. This originates from the joint effect of single-direction transitions and spin polarization, which removes the symmetry between spin-up and spin-down transitions. The present mechanism of NDC is remarkably different from the previously reported mechanisms. To clarify the physics of the NDC, we further monitored the shot noise spectroscopy and found that the appearance of the NDC is accompanied by the rapid decrease of Fano factor.

Key words: spintronics, single-molecule magnets, negative differential conductance, shot noise

中图分类号: (Spin polarized transport)

72.25.-b

75.50.Xx (Molecular magnets) 73.23.Hk (Coulomb blockade; single-electron tunneling) 72.70.+m (Noise processes and phenomena)

罗威, 王瑞强, 胡梁宾, 杨谋. Spin-dependent negative differential conductance in transport through single-molecule magnets[J]. Chin. Phys. B, 2013, 22(4): 47201-047201.

Luo Wei (罗威), Wang Rui-Qiang (王瑞强), Hu Liang-Bin (胡梁宾), Yang Mou (杨谋). Spin-dependent negative differential conductance in transport through single-molecule magnets[J]. Chin. Phys. B, 2013, 22(4): 47201-047201.

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Spin-dependent negative differential conductance in transport through single-molecule magnets

Spin-dependent negative differential conductance in transport through single-molecule magnets

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