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Chin. Phys. B, 2011, Vol. 20(1): 017307    DOI: 10.1088/1674-1056/20/1/017307
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Shot noise of the spin inelastic tunneling through a quantum dot with single molecule-magnet

Chang Bo(常博)and Liang Jiu-Qing(梁九卿)
Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China
Abstract  We have studied the quantum fluctuations of inelastic spin-electron scattering in quantum dot with an embedded biaxial single molecule-magnet and particularly investigated the zero-frequency shot noise and Fano factor in different magnetic fields. It is found that the shot noise and Fano factor exhibit a stepwise behaviour as bias increases in the presence of interaction between the electron and molecule-magnet for a weak magnetic field. As magnetic field becomes strong, a dip is displayed in the shot-noise-bias curve due to the suppression of inelastic shot noise caused by the quantum tunneling of magnetisation. Because of the spontaneous inelastic tunneling at zero bias, a small shot noise occurs, which results in the case of Fano factor F >> 1. Moreover, our results show that the sweeping speed can also influence the shot noise and Fano factor obviously.
Keywords:  quantum dot      shot noise      molecular magnet      quantum tunneling of spin  
Received:  29 June 2010      Revised:  26 August 2010      Accepted manuscript online: 
PACS:  73.63.Kv (Quantum dots)  
  74.78.Na (Mesoscopic and nanoscale systems)  
  75.50.Xc  
  75.45.+j (Macroscopic quantum phenomena in magnetic systems)  

Cite this article: 

Chang Bo(常博)and Liang Jiu-Qing(梁九卿) Shot noise of the spin inelastic tunneling through a quantum dot with single molecule-magnet 2011 Chin. Phys. B 20 017307

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