Double quantum dots: interdot interactions, co-tunneling, and Kondo resonances without spin

Abstract

We show that through an interdot off-site electron correlation in a double quantum-dot (DQD) device, Kondo resonances emerge in the local density of states without the electron spin-degree of freedom. We identify the physical mechanism behind this phenomenon: rather than forming a spin singlet in the device as required in the conventional Kondo physics, we found that exchange of electron position between the two quantum dots, together with the off-site Coulomb interaction, are sufficient to induce the Kondo resonance. Due to peculiar co-tunneling events, the Kondo resonance in one dot may be pinned at the chemical potential of the other one.

12 pages, 3 figures, LaTex

References in corpus (4)

• Revival of the Kondo effect
• Kondo resonant spectra in coupled quantum dots
• Measuring the Out-of-Equilibrium Splitting of the Kondo Resonance
• Kondo resonance in a multi-probe quantum dot

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