Direkt zum Inhalt

Kulig, Marvin ; Zipfel, Jonas ; Nagler, Philipp ; Blanter, Sofia ; Schüller, Christian ; Korn, Tobias ; Paradiso, Nicola ; Glazov, Mikhail M. ; Chernikov, Alexey

Exciton Diffusion and Halo Effects in Monolayer Semiconductors

Kulig, Marvin, Zipfel, Jonas, Nagler, Philipp, Blanter, Sofia, Schüller, Christian, Korn, Tobias , Paradiso, Nicola , Glazov, Mikhail M. and Chernikov, Alexey (2018) Exciton Diffusion and Halo Effects in Monolayer Semiconductors. Physical Review Letters 120 (20).

Date of publication of this fulltext: 30 Jul 2019 13:37
Article
DOI to cite this document: 10.5283/epub.40601


Abstract

We directly monitor exciton propagation in freestanding and SiO2-supported WS2 monolayers through spatially and time-resolved microphotoluminescence under ambient conditions. We find a highly nonlinear behavior with characteristic, qualitative changes in the spatial profiles of the exciton emission and an effective diffusion coefficient increasing from 0.3 to more than 30 cm(2)/s, depending on ...

We directly monitor exciton propagation in freestanding and SiO2-supported WS2 monolayers through spatially and time-resolved microphotoluminescence under ambient conditions. We find a highly nonlinear behavior with characteristic, qualitative changes in the spatial profiles of the exciton emission and an effective diffusion coefficient increasing from 0.3 to more than 30 cm(2)/s, depending on the injected exciton density. Solving the diffusion equation while accounting for Auger recombination allows us to identify and quantitatively understand the main origin of the increase in the observed diffusion coefficient. At elevated excitation densities, the initial Gaussian distribution of the excitons evolves into long-lived halo shapes with mu m-scale diameter, indicating additional memory effects in the exciton dynamics.



Involved Institutions


Details

Item typeArticle
Journal or Publication TitlePhysical Review Letters
Publisher:AMER PHYSICAL SOC
Place of Publication:COLLEGE PK
Volume:120
Number of Issue or Book Chapter:20
Date2018
InstitutionsPhysics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Junior Research Group Alexey Chernikov
Identification Number
ValueType
10.1103/PhysRevLett.120.207401DOI
KeywordsTRANSPORT; EXCITATION; WSE2; WS2; PHOTOLUMINESCENCE; ELECTRONS; EVOLUTION; DYNAMICS; LIGHT; DECAY;
Dewey Decimal Classification500 Science > 530 Physics
StatusPublished
RefereedYes, this version has been refereed
Created at the University of RegensburgYes
URN of the UB Regensburgurn:nbn:de:bvb:355-epub-406013
Item ID40601

Export bibliographical data

Owner only: item control page

nach oben