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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Persistent Inter-Excitonic Quantum Coherence in CdSe Quantum Dots.

Justin R Caram1, Haibin Zheng1, Peter D Dahlberg2

  • 1Department of Chemistry, The Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA.

The Journal of Physical Chemistry Letters
|April 11, 2014
PubMed
Summary
This summary is machine-generated.

Researchers observed long-lived quantum coherence in cadmium selenide quantum dots at room temperature. This intradot phenomenon, lasting ~80 fs, opens new avenues for developing advanced optoelectronic materials.

Keywords:
Coherent DynamicsSemiconducting NanocrystalsTwo dimensional spectroscopy

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Area of Science:

  • Quantum mechanics
  • Materials science
  • Optoelectronics

Background:

  • Quantum superpositions are key for novel optoelectronic materials.
  • Developing materials with controllable quantum properties is a significant scientific goal.

Purpose of the Study:

  • To investigate quantum coherence between excitonic states in colloidal quantum dots.
  • To understand the factors influencing the lifetime and nature of this coherence.

Main Methods:

  • Utilized Two-Dimensional Electronic Spectroscopy (2DES) to measure quantum coherence.
  • Studied zinc-blende colloidal Cadmium Selenide (CdSe) quantum dots at room temperature.
  • Employed theoretical modeling to analyze coherence lifetime and phase preservation.

Main Results:

  • Observed persistent quantum coherence with a lifetime of approximately 80 femtoseconds (fs).
  • Demonstrated that coherence is an intradot phenomenon, dependent on quantum dot size.
  • Showed that correlated interexcitonic fluctuations maintain the relative phase between excitonic states.

Conclusions:

  • Quantum coherence can be engineered in colloidal quantum dots.
  • Findings suggest a pathway for creating materials with enhanced optoelectronic properties.
  • Long-lived interexcitonic quantum coherence is achievable in CdSe quantum dots.