Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field

TY - JOUR

T1 - Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field

AU - Grap, Stephan

AU - Andergassen, Sabine

AU - Paaske, Jens

AU - Meden, Volker

PY - 2011/3/11

Y1 - 2011/3/11

N2 - We study electron transport through a serial double quantum dot with Rashba spin-orbit interaction (SOI) and Zeeman field of amplitude B in the presence of local Coulomb repulsion. The linear conductance as a function of a gate voltage Vg equally shifting the levels on both dots shows two B=0 Kondo ridges, which are robust against SOI as time-reversal symmetry is preserved. As a result of the crossing of a spin-up and a spin-down level at vanishing SOI, two additional Kondo plateaus appear at finite B. They are not protected by symmetry and rapidly vanish if the SOI is turned on. Left-right asymmetric level-lead couplings and detuned on-site energies lead to a simultaneous breaking of left-right and bonding-antibonding state symmetry. In this case, the finite-B Kondo ridges in the Vg-B plane are bent with respect to the Vg axis. For the Kondo ridge to develop, different level renormalizations must be compensated by adjusting B.

AB - We study electron transport through a serial double quantum dot with Rashba spin-orbit interaction (SOI) and Zeeman field of amplitude B in the presence of local Coulomb repulsion. The linear conductance as a function of a gate voltage Vg equally shifting the levels on both dots shows two B=0 Kondo ridges, which are robust against SOI as time-reversal symmetry is preserved. As a result of the crossing of a spin-up and a spin-down level at vanishing SOI, two additional Kondo plateaus appear at finite B. They are not protected by symmetry and rapidly vanish if the SOI is turned on. Left-right asymmetric level-lead couplings and detuned on-site energies lead to a simultaneous breaking of left-right and bonding-antibonding state symmetry. In this case, the finite-B Kondo ridges in the Vg-B plane are bent with respect to the Vg axis. For the Kondo ridge to develop, different level renormalizations must be compensated by adjusting B.

U2 - 10.1103/PhysRevB.83.115115

DO - 10.1103/PhysRevB.83.115115

M3 - Journal article

SN - 2469-9950

VL - 83

SP - 115115

JO - Physical Review B

JF - Physical Review B

IS - 11

ER -