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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photomodulation of transport in monolayer dichalcogenides

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Meneses-Gustin, D. [1] ; Cabral, Luis [1] ; Lima, Matheus P. [1] ; Da Silva, Juarez L. F. [2] ; Margapoti, Emanuela [1] ; Ulloa, Sergio E. [3, 4] ; Marques, Gilmar E. [1] ; Lopez-Richard, Victor [1]
Total Authors: 8
[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[3] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 - USA
[4] Ohio Univ, Ohio Mat Inst, Athens, OH 45701 - USA
Total Affiliations: 4
Document type: Journal article
Source: Physical Review B; v. 98, n. 24 DEC 3 2018.
Web of Science Citations: 0

Surface functionalization emerges as an alternative pathway for electronic structure engineering in twodimensional (2D) systems. We explore a hybrid heterostructure built from a 2D transition-metal dichalcogenide atop a layer of photochromic self-assembled azobenzene molecules. This setup can modify carrier transport through the 2D nanosheet by an effective photoactived gating control, achieved through trans to cis isomerization of the azobenzene in close contact with the 2D nanosheet. We show theoretically that this behavior can be ascribed to a tunable gating mechanism. We use a combination of atomistic calculations of the local effective potential profile with simulations of the electron scattering by such potential in a massive Dirac Hamiltonian formalism. We find that different isomers induce a local perturbation with drastically different features that explain well the experimental behavior. (AU)

FAPESP's process: 16/02065-0 - Carrier transport through photo-gated thin exfoliated dichalcogenide films
Grantee:Diana Mercedes Meneses Gustin
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 14/19142-2 - Characterization and processing of semiconductor nanostructures and application as devices
Grantee:Gilmar Eugenio Marques
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 14/02112-3 - Optical and transport phenomena in nano-devices
Grantee:Victor Lopez Richard
Support Opportunities: Regular Research Grants
FAPESP's process: 15/16175-0 - Assembling and characterization of 2D-molecularly photo-gated thin-film transistor
Grantee:Emanuela Margapoti
Support Opportunities: Scholarships in Brazil - Post-Doctoral