Transport properties of quantum dots with strong electron-phonon interaction

Tomoki Tasai, Mikio Eto

Research output: Contribution to journalArticle

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

Fingerprint

Electron transport properties
Electron-phonon interactions
Phonons
electron phonon interactions
Semiconductor quantum dots
Gene Conversion
transport properties
quantum dots
phonons
Electrons
Resonant tunneling
Polarons
Bias voltage
electrons
Large scale systems
polarons
resonant tunneling
interference
oscillations
composite materials

Keywords

  • Electron-phonon interaction
  • Polaron
  • Resonant tunneling
  • Self-assembled quantum dot

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Transport properties of quantum dots with strong electron-phonon interaction. / Tasai, Tomoki; Eto, Mikio.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 17, No. 1-4, 04.2003, p. 139-142.

Research output: Contribution to journalArticle

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