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

doi:10.1088/1674-1056/20/1/017307

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

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