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Lasing in Bose-Fermi mixtures.

Vladimir P Kochereshko1,2, Mikhail V Durnev1,2, Lucien Besombes3

  • 1Spin Optics Laboratory, Saint-Petersburg State University, 1, Ulianovskaya, 198504, St-Petersburg, Russia.

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|January 30, 2016
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Summary
This summary is machine-generated.

Magnetic fields dramatically alter mixed Bose-Fermi systems, enabling transitions between fermionic lasing, incoherent emission, and bosonic lasing in microcavities. This reveals a Bose gas to Fermi liquid transition driven by light-matter coupling.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Semiconductor physics

Background:

  • Fermionic lasers, like diode lasers, require population inversion for lasing.
  • Bosonic lasers utilize exciton-polaritons in semiconductor microcavities, which are neutral bosons coexisting with charged particles.
  • Magnetic fields confine charged particles while allowing neutral exciton-polaritons to move freely.

Purpose of the Study:

  • To investigate the influence of magnetic fields on the phase diagram of mixed Bose-Fermi systems.
  • To demonstrate the switching between different lasing regimes (fermionic, incoherent, bosonic) under magnetic field influence.
  • To explore the transition from a Bose gas to a Fermi liquid state mediated by magnetic fields and light-matter coupling.

Main Methods:

  • Fabrication and characterization of planar and pillar microcavity structures.
  • Optical pumping (continuous wave and pulsed) and electrical pumping (electron and hole injection).
  • Analysis of lasing properties under varying magnetic field strengths and excitation methods.

Main Results:

  • Magnetic fields significantly alter the phase diagram of mixed Bose-Fermi systems.
  • Demonstrated transitions between fermionic lasing, incoherent emission, and bosonic lasing regimes.
  • Observed evidence for a Bose gas to Fermi liquid transition induced by magnetic fields and light-matter interactions.

Conclusions:

  • Magnetic fields are crucial for controlling lasing dynamics in mixed Bose-Fermi systems.
  • The study highlights the tunable nature of lasing regimes in semiconductor microcavities.
  • Results provide insights into fundamental many-body physics in hybrid light-matter systems.