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Energy Carried By Electromagnetic Waves01:22

Energy Carried By Electromagnetic Waves

Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

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Published on: November 11, 2013

Electronic energy transfer on a vibronically coupled quantum aggregate.

Jan Roden1, Georg Schulz, Alexander Eisfeld

  • 1Max Planck Institute for the Physics of Complex Systems, Nothnitzer Str. 38, 01187 Dresden, Germany. roden@mpipks-dresden.mpg.de

The Journal of Chemical Physics
|August 7, 2009
PubMed
Summary
This summary is machine-generated.

Electronic excitation (exciton) transfer is slowed by vibrations and environmental interactions. Coupling to continuous environmental states can completely halt exciton migration, leading to trapping.

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Area of Science:

  • Physical Chemistry
  • Quantum Mechanics
  • Materials Science

Background:

  • Electronic excitation transfer is crucial in many physical and biological processes.
  • Understanding exciton dynamics requires considering molecular vibrations and environmental interactions.

Purpose of the Study:

  • To investigate how vibronic structure and environmental coupling affect exciton transport.
  • To identify key parameters governing electronic excitation migration.

Main Methods:

  • Analytical and numerical calculations.
  • Time evolution operator and time-dependent Green's function analysis.

Main Results:

  • Vibrational coupling generally slows down and inhibits exciton migration.
  • Dephasing effects due to vibrations disrupt coherent transfer.
  • Interaction with continuous environmental states leads to exciton trapping.

Conclusions:

  • Environmental interactions and internal vibrations significantly impede electronic excitation transport.
  • Exciton trapping occurs when coupling to a continuous spectrum of environmental states.