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Atomic fluctuations in electronic materials revealed by dephasing.

Samuel Palato1, Hélène Seiler1, Parmeet Nijjar2

  • 1Department of Chemistry, McGill University, Montréal, QC H3A 0B8, Canada.

Proceedings of the National Academy of Sciences of the United States of America
|May 16, 2020
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Electronic dephasing in cadmium selenide quantum dots is driven by atomic-level fluctuations, not static size variations. This finding, revealed through advanced spectroscopy, impacts quantum information and materials science.

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coherence mappingelectronic coherencequantum coherencetwo-dimensional electronic spectroscopyultrafast spectroscopy

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Spectroscopy

Background:

  • Electronic state fluctuations significantly influence electronic material properties, impacting photovoltaics and quantum information.
  • Spectroscopic methods, particularly multidimensional techniques, directly measure electronic fluctuations and dephasing processes.

Purpose of the Study:

  • To investigate the origin and timescale of electronic dephasing in cadmium selenide quantum dots (QDs).
  • To differentiate between vibrational and electronic coherence origins using advanced spectroscopy.
  • To challenge existing models of exciton behavior in QDs.

Main Methods:

  • Utilized multidimensional spectroscopy with coherence mapping in amplitude and phase.
  • Studied the model system of cadmium selenide (CdSe) quantum dots (QDs).
  • Compared experimental results with ab initio molecular dynamics simulations.

Main Results:

  • Successfully mapped coherent longitudinal optical (LO) phonons as an internal standard.
  • Observed unexpectedly fast electronic dephasing between the first two exciton states in CdSe QDs.
  • Experimental findings contradicted predictions from the standard effective mass model.

Conclusions:

  • Electronic dephasing in CdSe QDs is primarily governed by atomic-level electronic structure fluctuations.
  • Static size distribution is not the dominant factor in observed electronic dephasing.
  • This technique provides a unique pathway to study electronic fluctuations in complex materials.