Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 139-142 |
| Number of pages | 4 |
| Journal | Physica E: Low-Dimensional Systems and Nanostructures |
| Volume | 17 |
| Issue number | 1-4 |
| DOIs | |
| Publication status | Published - 2003 Apr 1 |
| Event | Proceedings pf the International Conference on Superlattices - ICSNN 2002 - Touluse, France Duration: 2002 Jul 22 → 2002 Jul 26 |
Keywords
- Electron-phonon interaction
- Polaron
- Resonant tunneling
- Self-assembled quantum dot
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics