ZERO-BIAS CONDUCTANCE THROUGH SIDE-COUPLED DOUBLE QUANTUM DOTS
Low temperature zero-bias conductance through two side-coupled quantum dots is investigated usingWilson’s numerical renormalization group technique. A low-temperature phase diagram is computed. Near the particle-hole symmetric point localized electrons form a spin-singlet associated with weak conductance. For weak inter-dot coupling we find enhanced conductance due to the two-stage Kondo effect when two electrons occupy quantum dots . When quantum dots are populated with a single electron, the system enters the Kondo regime with enhanced conductance. Analytical expressions for the width of the Kondo regime and the Kondo temperature in this regime are given.
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- Lara, G. A., Orellana, P. A., Yanez, J. M., and Anda, E. V. (2004) Kondo effect in side coupled double quantum-dot molecule, cond-mat/0411661.Google Scholar