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Title: Polaronic Trions at the MoS2SrTiO3 Interface
Authors: Soumya Sarkar 
Sreetosh Goswami 
Maxim Trushin 
Surajit Saha 
Majid Panahandeh-Fard 
Saurav Prakash 
Sherman Jun Rong Tan
Mary Scott
Kian Ping Loh 
Shaffique Adam 
Sinu Mathew 
Thirumalai Venkatesan 
Keywords: 2D materials
antiferrodistortive transition
soft phonons
transition metal oxides
Issue Date: 26-Aug-2019
Publisher: WILEY
Citation: Soumya Sarkar, Sreetosh Goswami, Maxim Trushin, Surajit Saha, Majid Panahandeh-Fard, Saurav Prakash, Sherman Jun Rong Tan, Mary Scott, Kian Ping Loh, Shaffique Adam, Sinu Mathew, Thirumalai Venkatesan (2019-08-26). Polaronic Trions at the MoS2SrTiO3 Interface. Advanced Materials 31 : 1903569. ScholarBank@NUS Repository.
Abstract: The reduced electrical screening in 2D materials provides an ideal platform for realization of exotic quasiparticles, that are robust and whose functionalities can be exploited for future electronic, optoelectronic, and valleytronic applications. Recent examples include an interlayer exciton, where an electron from one layer binds with a hole from another, and a Holstein polaron, formed by an electron dressed by a sea of phonons. Here, a new quasiparticle is reported, “polaronic trion” in a heterostructure of MoS2/SrTiO3 (STO). This emerges as the Fröhlich bound state of the trion in the atomically thin monolayer of MoS2 and the very unique low energy soft phonon mode (≤7 meV, which is temperature and field tunable) in the quantum paraelectric substrate STO, arising below its structural antiferrodistortive (AFD) phase transition temperature. This dressing of the trion with soft phonons manifests in an anomalous temperature dependence of photoluminescence emission leading to a huge enhancement of the trion binding energy (≈70 meV). The soft phonons in STO are sensitive to electric field, which enables field control of the interfacial trion–phonon coupling and resultant polaronic trion binding energy. Polaronic trions could provide a platform to realize quasiparticle‐based tunable optoelectronic applications driven by many body effects.
Source Title: Advanced Materials
ISSN: 15214095
DOI: 10.1002/adma.201903569
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