Magnetic-field tuning of the intraexcitonic absorption and gain in transition metal dichalcogenides

T. Stroucken, J. Neuhaus, S. W. Koch

Research output: Contribution to journalArticlepeer-review

Abstract

A systematic microscopic approach combining ab-initio density functional theory with the Dirac-Bloch equations is applied to investigate the intra-excitonic transitions of magneto-excitons in transition metal dichalcogenide monolayers. For the example of hBN-encapsulated MoS2, the linear optical response and mid-infrared spectra of the pre-excited system are numerically evaluated. It is shown that the transition probability between a subset of the magneto-excitons can be inverted under suitable conditions to display negative absorption, i.e., gain. With the help of an applied magnetic field, the absorption and gain spectra can be tuned over a wide spectral range. Evaluating the Zeeman shift of the excitonic states, effective g factors are deduced that depend on the dielectric environment of the sample under consideration.

Original languageEnglish (US)
Article number075438
JournalPhysical Review B
Volume104
Issue number7
DOIs
StatePublished - Aug 15 2021
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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