title: Correlation-induced conductance suppression at level degeneracy in a quantum dot.
abstract: The large, level-dependent g factors in an InSb nanowire quantum dot allow for the occurrence of a variety of level crossings in the dot. While we observe the standard conductance enhancement in the Coulomb blockade region for aligned levels with different spins due to the Kondo effect, a vanishing of the conductance is found at the alignment of levels with equal spins. This conductance suppression appears as a canyon cutting through the web of direct tunneling lines and an enclosed Coulomb blockade region. In the center of the Coulomb blockade region, we observe the predicted correlation-induced resonance. Our findings are supported by numerical and analytical calculations.
authors.affiliation: Nanometer Structure Consortium, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: H A
authors.initials: HA
authors.lastname: Nilsson
authors.forename: O
authors.initials: O
authors.lastname: Karlström
authors.forename: M
authors.initials: M
authors.lastname: Larsson
authors.forename: P
authors.initials: P
authors.lastname: Caroff
authors.forename: J N
authors.initials: JN
authors.lastname: Pedersen
authors.forename: L
authors.initials: L
authors.lastname: Samuelson
authors.forename: A
authors.initials: A
authors.lastname: Wacker
authors.forename: L-E
authors.initials: LE
authors.lastname: Wernersson
authors.forename: H Q
authors.initials: HQ
authors.lastname: Xu