Transport properties of quantum dots with strong electron-phonon interaction

Tomoki Tasai, Mikio Eto

Research output: Contribution to journalConference article

3 Citations (Scopus)

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 languageEnglish
Pages (from-to)139-142
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume17
Issue number1-4
DOIs
Publication statusPublished - 2003 Apr 1
EventProceedings pf the International Conference on Superlattices - ICSNN 2002 - Touluse, France
Duration: 2002 Jul 222002 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

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