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Applied Physics Letters / Volume 100 / Issue 1 / DEVICE PHYSICS

Appl. Phys. Lett. 100, 013502 (2012); http://dx.doi.org/10.1063/1.3673840 (3 pages)

Perfect spin-filter and highly spin-polarized current in a quantum network device

Hua-Hua Fu1 and Kai-Lun Yao1,2

1Department of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
2China Center of Advanced Science and Technology (CCAST), Beijing 100080, People’s Republic of China

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(Received 19 August 2011; accepted 10 December 2011; published online 3 January 2012)

We report a design to realize perfect spin-filter and highly spin-polarized current in a quantum network device composed of multiple quantum dots (QDs). By producing an energy difference between the site energy of the upper QDs and down ones, the linear conductance spectra present well-defined insulating bands with very steep edges due to the Fano antiresonance in some suitable conditions. Considering a Zeeman splitting, highly to 100% spin-polarized windows appear in the conductance spectra, which makes the network device can be used as a perfect spin filter to generate completely spin-polarized current. This idea opens a practical way to prompt other similar configures of the network to realize perfect spin-filter.

© 2012 American Institute of Physics

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KEYWORDS and PACS

Keywords

electrical conductivity, semiconductor devices, semiconductor quantum dots, spin polarised transport, Zeeman effect

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3673840

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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