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Electrically Tunable Single Polaritonic Quantum Dot at Room Temperature.

Hyeongwoo Lee1, Benjamin G Whetten2, Byong Jae Kim3

  • 1Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

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We demonstrate electric field control of exciton-polaritons in a single quantum dot at room temperature. This tunability allows dynamic switching between weak and strong light-matter coupling regimes.

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Area of Science:

  • Optics and Photonics
  • Quantum Dots
  • Plasmonics

Background:

  • Exciton-polaritons are hybrid light-matter quasiparticles with unique optical properties.
  • Plasmonic cavities enhance light-matter interactions.
  • Quantum dots are semiconductor nanocrystals with tunable optical properties.

Purpose of the Study:

  • To demonstrate electric field tunability of a single exciton-polariton system.
  • To investigate the transition between weak and strong coupling regimes.
  • To explore the application of electric-field tip-enhanced spectroscopy.

Main Methods:

  • Utilizing electric-field tip-enhanced strong coupling spectroscopy.
  • Confining a single quantum dot within a nanoplasmonic tip cavity.
  • Applying a variable DC local electric field.

Main Results:

  • Achieved dynamic control over the Rabi frequency of the exciton-polariton.
  • Observed a transition from weak to strong coupling.
  • Demonstrated room-temperature operation.

Conclusions:

  • Electric field control of exciton-polaritons in quantum dots is feasible.
  • The quantum confined Stark effect governs behavior in the strong coupling regime.
  • This work opens avenues for tunable quantum optical devices.