SU(4) Kondo effect in carbon nanotubes.
We investigate theoretically the nonequilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the role of a pseudospin, which is entangled with the spin. Quantum fluctuations between these 4 degrees of freedom result in an SU(4) Kondo effect at low temperatures. This exotic Kondo effect manifests as a four-peak splitting in the nonlinear conductance when an axial magnetic field is applied.
Choi
Manh-Soo
MS
Department of Physics, Korea University, Seoul 136-701, Korea.
López
Rosa
R
Aguado
Ramón
R