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Title: Evidence of Rotational Fröhlich Coupling in Polaronic Trions
Authors: Trushin, Maxim 
Sarkar, Soumya 
Mathew, Sinu 
Goswami, Sreetosh 
Sahoo, Prasana
Wang, Yan
Yang, Jieun
Li, Weiwei
MacManus-Driscoll, Judith L
Chhowalla, Manish
Adam, Shaffique 
Venkatesan, T 
Keywords: cond-mat.mes-hall
Issue Date: 19-Nov-2019
Publisher: American Physical Society (APS)
Citation: Trushin, Maxim, Sarkar, Soumya, Mathew, Sinu, Goswami, Sreetosh, Sahoo, Prasana, Wang, Yan, Yang, Jieun, Li, Weiwei, MacManus-Driscoll, Judith L, Chhowalla, Manish, Adam, Shaffique, Venkatesan, T (2019-11-19). Evidence of Rotational Fröhlich Coupling in Polaronic Trions. Physical Review Letters 125 (8). ScholarBank@NUS Repository.
Abstract: Electrons commonly couple through Fr\"ohlich 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 Fr\"ohlich 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 MoS$_2$ and the bulk transition metal oxide SrTiO$_3$. The low-temperature {binding energy} changes from 60 meV in [001]-oriented substrates to 90 meV for [111] orientation, as a result of the counter-intuitive interplay between the rotational axis of the MoS$_2$ trion and that of the SrTiO$_3$ phonon mode.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/physrevlett.125.086803
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