We theoretically examine the transport properties of quantum dots with strong electron-phonon interaction. When a separation between discrete electron-levels in a quantum dot matches the energy of the LO phonons, the electron-phonon interaction results in polarons, coherent states consisting of an electron and LO phonons. The Rabi splitting between two levels in the quantum dot is observable in a peak structure of the differential conductance G as a function of the bias voltage. The polaron formation suppresses the peak height of G, which is due to the competition between the resonant tunneling (resonance between a level in the dot and states in the leads) and the polaron formation (Rabi oscillation between two levels in the dot). G shows a sharp dip at the midpoint between the split peaks. This is attributable to the destructive interference between bonding and anti-bonding states in a composite system of an electron and phonons.
|ジャーナル||Physica E: Low-Dimensional Systems and Nanostructures|
|出版ステータス||Published - 2003 4|
|イベント||Proceedings pf the International Conference on Superlattices - ICSNN 2002 - Touluse, France|
継続期間: 2002 7 22 → 2002 7 26
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