Conference on Quantum Matter in Low Dimensions: Opportunities and Challenges

Exchange cotunneling in quantum dots with spin-orbit coupling

9 Sept 2010, 11:00

40m

Albanova University Center, room FD5

Speaker

Jens Paaske (NBI, Copenhagen)

Description

In this talk I shall report on 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 takes place via a Kramers doublet and the SOI will merely affect the Kondo temperature. In contrast, 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 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.
Reference: J. Paaske, A. Andersen, K. Flensberg, arXiv:1006.2371

Presentation materials

Slides

2010-09-09-3-Paaske.pdf