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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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Hyperpolarized Xenon for NMR and MRI Applications
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Published on: September 6, 2012

An electrically pumped polariton laser.

Christian Schneider1, Arash Rahimi-Iman, Na Young Kim

  • 1Technische Physik and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Universität Würzburg, D-97074 Würzburg, Am Hubland, Germany. christian.schneider@physik.uni-wuerzburg.de

Nature
|May 17, 2013
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate the first electrically pumped polariton laser, a crucial step for energy-efficient coherent light generation. This breakthrough promises practical applications for polaritonic light sources and condensates.

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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Semiconductor device physics

Background:

  • Conventional semiconductor lasers require significant energy due to stimulated photon emission.
  • Exciton-polaritons in microcavities offer a pathway to more energy-efficient coherent light via stimulated scattering.
  • Optically pumped polariton lasers have shown promise, but electrically pumped versions are needed for practical use.

Purpose of the Study:

  • To achieve and demonstrate the first electrically pumped polariton laser.
  • To overcome the limitations of conventional semiconductor lasers for energy efficiency.
  • To pave the way for practical applications of polaritonic light sources.

Main Methods:

  • Fabrication of a microcavity containing multiple quantum wells for exciton-polariton formation.
  • Electrical pumping of the microcavity structure to achieve stimulated scattering.
  • Application of a magnetic field to probe the hybrid light-matter nature of polaritons and confirm laser emission.

Main Results:

  • Successful demonstration of an electrically pumped polariton laser.
  • Unambiguous confirmation of polariton laser emission through magnetic field probing.
  • Evidence of the hybrid light-matter characteristics of the emitted polaritons.

Conclusions:

  • This work presents a significant advancement towards practical, energy-efficient polaritonic light sources.
  • The electrically pumped polariton laser is a key step for realizing electrically injected condensates.
  • Future work can focus on room-temperature operation using wide-bandgap materials.