Cavity-modified temperature dynamics of valley-polarized exciton-polaritons in monolayer MoS2

ORAL

Abstract

Exciton-polaritons, strongly-coupled light-matter quasiparticles, can preserve the valley selectivity of monolayer transition metal dichalcogenides embedded in a microcavity. The cavity field character of the exciton-polaritons modifies the emission properties of the monolayer, leading to preservation of luminescence polarization at room temperature distinct from bare monolayers. Here, we explore both experimentally and theoretically broad regimes of cavity coupling with MoS2 and their impact on exciton-polariton valley polarization observed over a large temperature range. An intuitive and general cavity coupling model captures these observations by considering the relative rates of exciton and photon relaxation and intervalley scattering. The experimental and theoretical agreement demonstrates that exciton-polariton valley polarization dynamics can be well-controlled using cavity decay rates, coupling strengths, and detunings by microcavity engineering.

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Presenters

  • Yen-Jung Chen

    Physics and Astronomy, Northwestern University

Authors

  • Yen-Jung Chen

    Physics and Astronomy, Northwestern University

  • Itamar Balla

    Department of Materials Science and Engineering, Northwestern University, Materials Science and Engineering, Northwestern University

  • Hadallia Bergeron

    Department of Materials Science and Engineering, Northwestern University, Materials Science and Engineering, Northwestern University

  • Lei Liu

    Physics and Astronomy, Northwestern University

  • Mark Hersam

    Department of Material Science, Northwestern University, Northwestern Univ., Department of Materials Science and Engineering, Northwestern University, Materials Science and Engineering, Northwestern University

  • Nathaniel Stern

    Department of Physics, Northwestern University, Department of Physics and Astronomy, Northwestern University, Physics and Astronomy, Northwestern University