Exchange cotunneling through quantum dots with spin-orbit coupling

TY - JOUR

T1 - Exchange cotunneling through quantum dots with spin-orbit coupling

AU - Paaske, Jens

AU - Andersen, Andreas

AU - Flensberg, Karsten

PY - 2010/8/31

Y1 - 2010/8/31

N2 - We investigate the effects of spin-orbit interaction (SOI) on the exchange cotunneling through a spinful Coulomb blockaded quantum dot. In the case of zero magnetic field, Kondo effect is shown to take place via a Kramers doublet and the SOI will merely affect the Kondo temperature. In contrast, we find that the breaking of time-reversal symmetry in a finite field has a marked influence on the effective Anderson and Kondo models for a single level. The nonlinear conductance can now be asymmetric in bias voltage and may depend strongly on the direction of the magnetic field. A measurement of the angle dependence of finite-field cotunneling spectroscopy thus provides valuable information about orbital and spin degrees of freedom and their mutual coupling.

AB - We investigate the effects of spin-orbit interaction (SOI) on the exchange cotunneling through a spinful Coulomb blockaded quantum dot. In the case of zero magnetic field, Kondo effect is shown to take place via a Kramers doublet and the SOI will merely affect the Kondo temperature. In contrast, we find that the breaking of time-reversal symmetry in a finite field has a marked influence on the effective Anderson and Kondo models for a single level. The nonlinear conductance can now be asymmetric in bias voltage and may depend strongly on the direction of the magnetic field. A measurement of the angle dependence of finite-field cotunneling spectroscopy thus provides valuable information about orbital and spin degrees of freedom and their mutual coupling.

U2 - 10.1103/PhysRevB.82.081309

DO - 10.1103/PhysRevB.82.081309

M3 - Journal article

SN - 0163-1829

VL - 82

SP - 081309(R)

JO - Physical Review B Condensed Matter

JF - Physical Review B Condensed Matter

ER -