Evidence of Rotational Fröhlich Coupling in Polaronic Trions

Maxim Trushin, Soumya Sarkar, Sinu Mathew, Sreetosh Goswami, Prasana Sahoo, Yan Wang, Jieun Yang, Weiwei Li, Judith L. MacManus-Driscoll, Manish Chhowalla, Shaffique Adam, T. Venkatesan

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Electrons commonly couple through Fröhlich interactions with longitudinal optical phonons to form polarons. However, trions possess a finite angular momentum and should therefore couple instead to rotational optical phonons. This creates a polaronic trion whose binding energy is determined by the crystallographic orientation of the lattice. Here, we demonstrate theoretically within the Fröhlich approach and experimentally by photoluminescence emission that the bare trion binding energy (20 meV) is significantly enhanced by the phonons at the interface between the two-dimensional semiconductor MoS2 and the bulk transition metal oxide SrTiO3. The low-temperature binding energy changes from 60 meV in [001]-oriented substrates to 90 meV for [111] orientation, as a result of the counterintuitive interplay between the rotational axis of the MoS2 trion and that of the SrTiO3 phonon mode.

Original languageEnglish
Article number086803
JournalPhysical review letters
Issue number8
Publication statusPublished - Aug 21 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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