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Related Experiment Videos

Trion-Species-Resolved Quantum Beats in MoSe2.

Gabriella D Shepard1,2, Jenny V Ardelean3, Obafunso A Ajayi3

  • 1Department of Physics, Stevens Institute of Technology , Hoboken, New Jersey 07030, United States.

ACS Nano
|October 17, 2017
PubMed
Summary

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Monolayer MoSe2 reveals long coherence times for excitons and trions in linear optical response. This breakthrough enables advanced on-chip quantum information processing and nanolasers.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Monolayer photonic materials are crucial for on-chip optoelectronics.
  • Understanding exciton and trion optical coherence is vital but challenging.
  • Previous studies relied on nonlinear optics with broadened materials.

Purpose of the Study:

  • To directly reveal trion coherence properties in the linear optical response.
  • To investigate coherence in h-BN-encapsulated and electrically gated MoSe2.
  • To explore the impact of charge carrier concentration on trion dephasing.

Main Methods:

  • Utilized h-BN-encapsulated, electrically gated MoSe2.
  • Performed autocorrelation measurements.
  • Conducted gate-dependent optical response studies.
Keywords:
2D materialscoherencedephasing timeexcitonquantum beatstrion

Related Experiment Videos

  • Analyzed quantum beat signatures.

    • Main Results:

    • Achieved long dephasing times up to 1.16 ps for positively charged excitons.
    • Demonstrated that positively charged trions form via localized hole states, reducing dephasing.
    • Observed coherent coupling between excitons and trions with a dephasing time up to 0.6 ps.

    Conclusions:

    • Prolonged exciton/trion coherences were achieved in a linear optical experiment.
    • Results are directly applicable to nanolasers and quantum information processing.
    • Findings pave the way for advanced on-chip coherent control.