Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field
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Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field. / Grap, Stephan; Andergassen, Sabine; Paaske, Jens; Meden, Volker.
In: Physical Review B, Vol. 83, No. 11, 11.03.2011, p. 115115 .Research output: Contribution to journal › Journal article › Research › peer-review
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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
VL - 83
SP - 115115
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 11
ER -
ID: 36141385