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Exciton routing in the heterostructure of a transition metal dichalcogenide monolayer on a paraelectric substrate
ITMO Univ, St Petersburg 197101, Russia..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. ITMO Univ, St Petersburg 197101, Russia.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Univ Exeter, Dept Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 16, article id 165303Article in journal (Refereed) Published
Abstract [en]

We propose a scheme for the spatial exciton energy control and exciton routing in a transition-metal dichalcogenide (TMD) monolayer which lies on a quantum paraelectric substrate. It relies on the ultrasensitive response of the substrate dielectric permittivity to temperature changes, allowing for spatially inhomogeneous screening of Coulomb interaction in a monolayer. As an example, we consider the heterostructure of TMD and strontium titanate oxide SrTiO3, where large dielectric screening can be attained. We study the impact of substrate temperature on the characteristic electronic features of TMD monolayers such as the particle band gap and exciton binding energy, Bohr radius, and nonlinearity (an exciton-exciton interaction). The combination of particle band gap and exciton binding energy modulation results in the shift of the exciton resonance energy. Applying local heating, we create spatial patterns with varying exciton resonant energy and an exciton flow toward the energetically lower region of the sample.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 16, article id 165303
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-263341DOI: 10.1103/PhysRevB.100.165303ISI: 000490169800004Scopus ID: 2-s2.0-85074454787OAI: oai:DiVA.org:kth-263341DiVA, id: diva2:1371391
Note

QC 20191119

Available from: 2019-11-19 Created: 2019-11-19 Last updated: 2019-11-19Bibliographically approved

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Kyriienko, Oleksandr

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