Intervalley electron-hole exchange interaction and impurity-assisted recombination of indirect excitons in WS${}_2$ and WSe${}_2$ monolayers

Abstract

The variety of excitonic states in tungsten-based dichalcogenide monolayers stems from unique interplay between the spin and valley degrees of freedom. One of the exciton species is the indirect exciton (momentum or valley dark), which is responsible to a series of resonances when the monolayer is charge neutral. We investigate the short-range electron-hole exchange interaction of the indirect exciton, as well as its recombination mechanism mediated by impurities. The analysis provides thorough understanding of the energy and polarization of the zero-phonon indirect exciton resonance in the emission spectrum.

References in corpus (9)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Valley Phonons and Exciton Complexes in a Monolayer Semiconductor
• Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2
• Gate tunable dark trions in monolayer WSe${}_2$
• Long-Lived Valley Polarization of Intra-Valley Trions in Monolayer WSe2
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe${}_2$
• Donor-driven spin relaxation in multi-valley semiconductors
• Intrinsic Donor-Bound Excitons in Ultraclean Monolayer Semiconductors

Cited by in corpus (4)

• Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout
• Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides
• Ab initio quantum approach to electron-hole exchange for semiconductors hosting Wannier excitons
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors