Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-11-26
Phys. Rev. B 83, 115115 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 5 figures, revised version as published
Scientific paper
10.1103/PhysRevB.83.115115
We study electron transport through a serial double quantum dot with Rashba spin-orbit interaction (SOI) and Zeeman field of amplitude B in 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. Resulting from 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-anti-bonding 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.
Andergassen Sabine
Grap S.
Meden Volker
Paaske Jens
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