Interaction-Induced Resonance in Conductance and Thermopower of Quantum Wires

Details Interaction-Induced Resonance in Conductance and Thermopower of Quantum Wires Interaction-Induced Resonance in Conductance and Thermopower of Quantum Wires

2006-09-10

arxiv.org/abs/cond-mat/0609228v1

Phys. Rev. Lett. 97, 256802 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

We study the effect of electron-electron interaction on the transport properties of short clean quantum wires adiabatically connected to reservoirs. Interactions lead to resonances in a multi-channel wire at particular values of the Fermi energy. We investigate in detail the resonance in a two-channel wire. The (negative) conductance correction peaks at the resonance, and decays exponentially as the Fermi energy is tuned away; the resonance width being given by the temperature. Likewise, the thermopower shows a characteristic structure, which is surprisingly well approximated by the so-called Mott formula. Finally, four-fold splitting of the resonance in a magnetic field provides a unique signature of the effect.

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