期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 14, 期 19, 页码 4963-4976出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/14/19/318
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The current noise in a quantum dot (QD) coupled to two leads is investigated in the Kondo regime with and without the influence of magnetic fields by employing a finite-U slave-boson mean-field approach to calculate the current-current correlation function at zero temperature. The numerical results show that the Fano factor is always reduced significantly due to the Kondo-correlation effect, and the most pronounced suppression appears at the electron-hole symmetry case 2epsilon(d) + U = 0. In addition, the application of a magnetic field enhances the Fano factor at small external voltage, which is attributed to the reduction of the Kondo-enhanced density of states and transmission probability in a QD.
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