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Current and Shot Noise in a Quantum Dot Coupled to Ferromagnetic Leads in the Kondo Regime |
| LÜ Rong1,2;LIU Zhi-Rong3 |
| 1Center for Advanced Study, Tsinghua University, Beijing 100084
2Ludwig-Maximilians-Universität, Theresienstr. 37, 80333 München, Germany
3Max Planck Institute for Metals Research, Heisenbergstrasse 3, D-70569 Stuttgart, Germany |
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| Cite this article: |
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LÜ, Rong, LIU Zhi-Rong 2007 Chin. Phys. Lett. 24 195-198 |
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Abstract Using the Keldysh nonequilibrium Green function technique, we study the current and shot noise spectroscopy of an interacting quantum dot coupled to two ferromagnetic leads with different polarizations in the Kondo regime. General formulas of current and shot noise are obtained, which can be applied in both the parallel (P) and antiparallel (AP) alignment cases. For large polarization values, it is revealed that the behaviour of differential conductance and shot noise are completely different for spin up and spin down configurations in the P alignment case. However, the differential conductance and shot noise have similar properties for different spin configurations in the P alignment case with the small polarization value and in the AP alignment case with any polarization value.
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73.23.Hk
72.70.+m
73.63.Kv
72.25.-b
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Published: 01 January 2007
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| PACS: |
73.23.Hk
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(Coulomb blockade; single-electron tunneling)
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72.70.+m
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(Noise processes and phenomena)
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73.63.Kv
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(Quantum dots)
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72.25.-b
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(Spin polarized transport)
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