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Related Experiment Videos

Multivalley engineering in semiconductor microcavities.

M Sun1,2, I G Savenko1,3,4, H Flayac5

  • 1Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Republic of Korea.

Scientific Reports
|April 4, 2017
PubMed
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We theoretically show that coupled exciton-photon systems in microcavities can create multiple ground states. This polarization-valley coupling enables valleytronics and momentum symmetry breaking.

Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Materials science

Background:

  • Semiconductor microcavities confine light-matter interactions.
  • Periodic potentials can engineer exciton and photon properties.
  • Polarization-valley coupling is a key phenomenon in spintronics and valleytronics.

Purpose of the Study:

  • To theoretically investigate exciton-photon coupling in microcavities with separate periodic potentials.
  • To explore the emergence of degenerate ground states and their properties.
  • To predict phenomena like spontaneous momentum symmetry breaking and two-mode squeezing.

Main Methods:

  • Theoretical modeling of exciton-photon coupling.
  • Analysis of systems with embedded periodic potentials for excitons and photons.

Related Experiment Videos

  • Investigation of ground-state properties at non-zero in-plane momenta.

    • Main Results:

    • Demonstration of degenerate ground states at non-zero in-plane momenta.
    • Observation of polarization-valley coupling due to separated valleys in reciprocal space.
    • Prediction of spontaneous momentum symmetry breaking and two-mode squeezing.

    Conclusions:

    • The studied system provides a basis for valleytronics.
    • Multivalley dispersion allows for novel quantum phenomena.
    • The findings open new avenues for controlling quantum states in semiconductor systems.