title: Tunneling through a quantum dot in local spin singlet-triplet crossover region with Kondo effect.
abstract: Tunneling conductance through a quantum dot is calculated around the local spin singlet-triplet crossover region including the Kondo effect. The calculation is carried out using the numerical renormalization group method. When the potential on the dot deepens, two electrons filling a lower energy orbital redistribute to gain Hund's coupling energy. This redistribution induces a bump in the conductance between the Coulomb peaks. The Kondo temperature on the bump is high due to the fluctuation on the singlet-triplet crossover region. The behaviors agree well with recent experiment.
authors.affiliation: Mesoscopic Correlation Project, ERATO, JST, NTT Atsugi R & D Center, Atsugi-shi, Kanagawa 243-0198, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Izumida
authors.forename: O
authors.initials: O
authors.lastname: Sakai
authors.forename: S
authors.initials: S
authors.lastname: Tarucha