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Coherent ultrafast excitonic oscillations in monolayer WS2

Jorge Cervantes-Villanueva1,*, Alberto García-Cristóbal1, Davide Sangalli2, and Alejandro Molina-Sánchez1

  • *Contact author: jorge.cervantes@uv.es
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Phys. Rev. Materials 10, 114001 – Published 2 November, 2026

DOI: https://doi.org/10.1103/6btt-d5tq

Abstract

Monolayer transition metal dichalcogenides are a suitable platform for studying excitonic coherence in the light-matter coupling regime. We present an ab initio time-dependent GW–Bethe-Salpeter equation investigation of coherent excitonic dynamics in monolayer WS2. By solving the coherent coupling between the A, A*, and B excitons under linearly polarized pump fields, we identify the microscopic origin of the resulting oscillatory dynamics and rationalize it using an effective theoretical model. Building on this first-principles time-resolved framework, we propose a tailored pump-probe scheme that enables the controlled generation and regeneration of coherent oscillations between excitonic states. These findings establish a predictive route for controlling excitonic coherence in two-dimensional materials, with direct relevance for ultrafast optoelectronic switches and solid-state quantum logic devices.

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Phys. Rev. Materials 10, 114001– Published 2 November, 2026
  • Received 27 March 2026
  • Accepted 28 September 2026
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