Ultrafast band-gap renormalization and build-up of optical gain in monolayer MoTe2

L. Meckbach, J. Hader, U. Huttner, J. Neuhaus, J. T. Steiner, T. Stroucken, J. V. Moloney, S. W. Koch

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Abstract

The dynamics of band-gap renormalization and gain build-up in monolayer MoTe2-H is investigated by evaluating the nonequilibrium Dirac-Bloch equations with the incoherent carrier-carrier and carrier-phonon scattering treated via quantum-Boltzmann type scattering equations. For the case where an approximately 300-fs-long high-intensity optical pulse generates charge-carrier densities in the gain regime, the strong Coulomb coupling leads to a relaxation of excited carriers on a few-femtosecond timescale. The pump-pulse generation of excited carriers induces a large band-gap renormalization during the timescale of the pulse. Efficient phonon coupling leads to a subsequent carrier thermalization within a few picoseconds, which defines the timescale for the optical gain build-up energetically close to the low-density exciton resonance.

Original languageEnglish (US)
Article number075401
JournalPhysical Review B
Volume101
Issue number7
DOIs
StatePublished - Feb 15 2020

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Meckbach, L., Hader, J., Huttner, U., Neuhaus, J., Steiner, J. T., Stroucken, T., Moloney, J. V., & Koch, S. W. (2020). Ultrafast band-gap renormalization and build-up of optical gain in monolayer MoTe2. Physical Review B, 101(7), [075401]. https://doi.org/10.1103/PhysRevB.101.075401