Field-induced dissociation of two-dimensional excitons in transition-metal dichalcogenides

Abstract

Generation of photocurrents in semiconducting materials requires dissociation of excitons into free charge carriers. While thermal agitation is sufficient to induce dissociation in most bulk materials, an additional push is required to induce efficient dissociation of the strongly bound excitons in monolayer transition-metal dichalcogenides (TMDs). Recently, static in-plane electric fields have proven to be a promising candidate. In the present paper, we introduce a numerical procedure, based on exterior complex scaling, capable of computing field-induced exciton dissociation rates for a wider range of field strengths than previously reported in literature. We present both Stark shifts and dissociation rates for excitons in various TMDs calculated within the Mott-Wannier model. Here, we find that the field induced dissociation rate is strongly dependent on the dielectric screening environment. Furthermore, applying weak-field asymptotic theory (WFAT) to the Keldysh potential, we are able to derive an analytical expression for exciton dissociation rates in the weak-field region.

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Cited by in corpus (11)

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• A colloquium on the variational method applied to excitons in 2D materials
• Spectral measurement of the breakdown limit of $\beta -G{a}_2{O}_3$ and tunnel ionization of self-trapped excitons and holes
• Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene
• Phonon-assisted Exciton Dissociation in Transition Metal Dichalcogenides
• Exciton dissociation in two-dimensional transition metal dichalcogenides: Excited states and substrate effects
• Dephasing of Strong-Field-Driven Floquet States Revealed by Time- and Spectrum-Resolved Quantum-Path Interferometry
• Analytical Quantitative Semi-Classical Approach to the LoSurdo-Stark Effect and Ionization in 2D excitons
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Efficient ionization of two dimensional excitons by intense single cycle terahertz pulses
• Finite-difference time-domain simulation of strong-field ionization: Perfectly matched layer approach