TY - GEN
T1 - Nonequilibrium Transport through a Kondo-dot in a Magnetic Field
AU - Wölfle, Peter
AU - Rosch, Achim
AU - Paaske, Jens
AU - Kroha, Johann
PY - 2002
Y1 - 2002
N2 - Electron transport through a quantum-dot in the Coulomb blockade regime is modeled by a Kondo-type hamiltonian describing spin-dependent tunneling and exchange interaction with the local spin. We consider the regime of large transport voltage V and magnetic field B with max(V, B) » Tk, the Kondo temperature, and show that a renormalized perturbation theory can be formulated describing the local magnetization M and the differential conductance G quantitatively. Based on the structure of leading logarithmic corrections in bare perturbation theory we argue that the perturbative renormalization group has to be generalized to allow for frequency dependent coupling functions. We simplify the full RG equations in the spirit of poor man’s scaling and calculate M and G in leading order of 1/ln[(V, B)/T k].
AB - Electron transport through a quantum-dot in the Coulomb blockade regime is modeled by a Kondo-type hamiltonian describing spin-dependent tunneling and exchange interaction with the local spin. We consider the regime of large transport voltage V and magnetic field B with max(V, B) » Tk, the Kondo temperature, and show that a renormalized perturbation theory can be formulated describing the local magnetization M and the differential conductance G quantitatively. Based on the structure of leading logarithmic corrections in bare perturbation theory we argue that the perturbative renormalization group has to be generalized to allow for frequency dependent coupling functions. We simplify the full RG equations in the spirit of poor man’s scaling and calculate M and G in leading order of 1/ln[(V, B)/T k].
U2 - 10.1007/3-540-45618-X_14
DO - 10.1007/3-540-45618-X_14
M3 - Conference article
SN - 1438-4329
VL - 42
SP - 175
EP - 185
JO - Advances in Solid State Physics
JF - Advances in Solid State Physics
ER -