Exciton-polaritons in transition-metal dichalcogenides and their direct excitation via energy transfer

Abstract

Excitons, composite electron-hole quasiparticles, are known to play an important role in optoelectronic phenomena in many semiconducting materials. Recent experiments and theory indicate that the band-gap optics of the newly discovered monolayer transition-metal dichalcogenides (TMDs) is dominated by tightly bound valley excitons. The strong interaction of excitons with long-range electromagnetic fields in these 2D systems can significantly affect their intrinsic properties. Here, we develop a semi-classical framework for intrinsic exciton-polaritons in monolayer TMDs that treats their dispersion and radiative decay on the same footing and can incorporate effects of the dielectric environment. It is demonstrated how both inter- and intra-valley long-range interactions influence the dispersion and decay of the polaritonic eigenstates. We also show that exciton-polaritons can be efficiently excited via resonance energy transfer from quantum emitters such as quantum dots, which may be useful for various applications.

6 pages, 2 figures

References in corpus (10)

• Valley polarization in MoS2 monolayers by optical pumping
• The Valley Hall Effect in MoS2 Transistors
• Strong light-matter coupling in two-dimensional atomic crystals
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Valley excitons in two-dimensional semiconductors
• Exciton band structure of monolayer MoS2
• Reduced dielectric screening and enhanced energy transfer in single and few-layer MoS2
• Unconventional Quantum Hall Effect and Tunable Spin Hall Effect in MoS2 Trilayers
• Electrical control of near-field energy transfer between quantum dots and 2D semiconductors
• Excitons in long molecular chains near the reflecting interface

Cited by in corpus (15)

• Nano-optical imaging of WSe2 waveguide modes revealing light-exciton interactions
• Spin-flip processes and radiative decay of dark intravalley excitons in transition metal dichalcogenide monolayers
• Light-Matter Interactions in Two-Dimensional Transition Metal Dichalcogenides: Dominant Excitonic Transitions in mono- and few-layer MoX${}_2$ and Band Nesting
• Novel valley depolarization dynamics and valley Hall effect of exciton in mono- and bilayer MoS${}_2$
• Interlayer Coupling in Two-Dimensional Semiconductor Materials
• Near-field relaxation of a quantum emitter to 2D semiconductors: surface dissipation and exciton polaritons
• Exciton-phonon relaxation bottleneck and radiative decay of thermal exciton reservoir in two-dimensional materials
• Resonantly excited exciton dynamics in two-dimensional MoSe${}_2$ monolayers
• Ab initio study of electromagnatic modes in two-dimensional semiconductors: Application to doped phosphorene
• Radiative and Non-Radiative Exciton Energy Transfer in Monolayers of Two-Dimensional Transition Metal Dichalcogenides
• Cavity exciton-polaritons in two-dimensional semiconductors from first principles
• Anisotropic exciton transport in transition-metal dichalcogenides
• Exciton-polaritons of a 2D semiconductor layer in a cylindrical microcavity
• Semiconductor Bloch equation analysis of optical Stark and Bloch-Siegert shifts in monolayers WSe${}_2$ and MoS${}_2$
• Valley-selective energy transfer between quantum dots in atomically thin semiconductors