Valley-magnetophonon resonance for interlayer excitons

D. S. Smirnov; J. Holler; M. Kempf; J. Zipfel; P. Nagler; M. V. Ballottin; A. A. Mitioglu; A. Chernikov; P. C. M. Christianen; C. Schüller; T. Korn

Valley-magnetophonon resonance for interlayer excitons

Mesoscale and Nanoscale Physics 2022-05-09 v1 Materials Science

Authors: D. S. Smirnov , J. Holler , M. Kempf , J. Zipfel , P. Nagler , M. V. Ballottin , A. A. Mitioglu , A. Chernikov , P. C. M. Christianen , C. Schüller , T. Korn

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Abstract

Heterobilayers consisting of MoSe $_2$ and WSe $_2$ monolayers can host optically bright interlayer excitons with intriguing properties such as ultralong lifetimes and pronounced circular polarization of their photoluminescence due to valley polarization, which can be induced by circularly polarized excitation or applied magnetic fields. Here, we report on the observation of an intrinsic valley-magnetophonon resonance for localized interlayer excitons promoted by invervalley hole scattering. It leads to a resonant increase of the photoluminescence polarization degree at the same field of 24.2 Tesla for H-type and R-type stacking configurations despite their vastly different excitonic energy splittings. As a microscopic mechanism of the hole intervalley scattering we identify the scattering with chiral TA phonons of MoSe $_2$ between excitonic states mixed by the long-range electron hole exchange interaction.

Keywords

excitonic physics in transition metal dichalcogenides

Cite

@article{arxiv.2205.03376,
  title  = {Valley-magnetophonon resonance for interlayer excitons},
  author = {D. S. Smirnov and J. Holler and M. Kempf and J. Zipfel and P. Nagler and M. V. Ballottin and A. A. Mitioglu and A. Chernikov and P. C. M. Christianen and C. Schüller and T. Korn},
  journal= {arXiv preprint arXiv:2205.03376},
  year   = {2022}
}

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7+5 pages, 2+0 figures

Valley-magnetophonon resonance for interlayer excitons

Abstract

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