Correlation-induced conductance suppression at level degeneracy in a quantum dot.
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.
Nilsson
H A
HA
Nanometer Structure Consortium, Lund University, Box 118, 221 00 Lund, Sweden.
Karlström
O
O
Larsson
M
M
Caroff
P
P
Pedersen
J N
JN
Samuelson
L
L
Wacker
A
A
Wernersson
L-E
LE
Xu
H Q
HQ