Abstract
We theoretically examine the effects of polaron formation in quantum dots on the transport properties. When a separation between two electron-levels in a quantum dot matches the energy of the longitudinal optical (LO) phonons, the polarons are strongly formed. The Rabi splitting between the levels 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 electrons and phonons.
| Original language | English |
|---|---|
| Pages (from-to) | 1495-1500 |
| Number of pages | 6 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 72 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2003 Jun |
Keywords
- LO phonon
- Polaron
- Quantum dot
- Rabi splitting
- Resonant tunneling
- Self-consistent Born approximation
ASJC Scopus subject areas
- Physics and Astronomy(all)