Nonlinear exciton drift in piezoelectric two-dimensional materials

Abstract

Noncentrosymmetric nature of single-layer transition metal dichalcogenides manifest itself in the finite piezoelectricity and valley-Zeeman coupling. We microscopically model nonlinear exciton transport in nano-bubble of single-layers of transition metal dichalcogenide. Thanks to the giant piezoelectric effect, we obtain an enormous internal electric field, $E_{\mathrm{piezo}}\sim 10^7$V/m, resulting in a built-in dipole moment of excitons. We demonstrate that the piezo-induced dipole-dipole interaction provides a novel channel for the nonlinear exciton transport distinct from the conventional isotropic funneling of excitons and leading to the formation of hexagon-shaped exciton droplet on top of a circularly symmetric nano-bubble. The effect is tunable via the bubble size dependence of the piezo-electric field $E_{\mathrm{piezo}}\sim h_{\max }^2/R^3$ with $h_{\max }$ and $R$ being the bubble height and radius, respectively.

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Cited by in corpus (4)

• Microscopic origin of anomalous interlayer exciton transport in van der Waals heterostructures
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• Tunable strongly interacting dipolar excitons in hybrid perovskites
• Coherent spin dynamics of excitons in strained monolayer semiconductors