Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-06-13
J. Magn. & Magn. Mater. 310, 1139 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
2pages, 2figures: fig1 is revised to show a narrow dip found in the series conductance
Scientific paper
We study transport through a triangle triple quantum dot connected to two noninteracting leads using the numerical renormalization group (NRG). The triangle has a high-spin ground state of S=1 caused by a Nagaoka ferromagnetism, when it is isolated and has one extra electron introduced into a half-filling. The results show that the conduction electrons screen the local moment via two separate stages with different energy scales. The half of the S=1 is screened first by one of the channel degrees, and then at very low temperature the remaining half is fully screened to form a Kondo singlet. The transport is determined by two phase shifts for quasi-particles with even and odd parities, and then a two-terminal conductance in the series configuration is suppressed $g_{\rm series} \simeq 0$, while plateau of a four-terminal parallel conductance reaches a Unitary limit value $g_{\rm parallel} \simeq 4e^2/h$ of two conducting modes.
Nisikawa Yunori
Numata Takahide
Oguri Akira
Tanaka Yoshihide
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