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Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures

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dc.abstract.enThe intriguing physics of carrier-carrier interactions, which likewise affect the operation of light emitting devices, stimulate the research on semiconductor structures at high densities of excited carriers, a limit reachable at large pumping rates or in systems with long-lived electron-hole pairs. By electrically injecting carriers into WSe 2 /MoS 2 type-II heterostructures which are indirect in real and k-space, we establish a large population of typical optically silent interlayer excitons. Here, we reveal their emission spectra and show that the emission energy is tunable by an applied electric field. When the population is further increased by suppressing the radiative recombination rate with the introduction of an hBN spacer between WSe 2 and MoS 2 , Auger-type and exciton-exciton annihilation processes become important. These processes are traced by the observation of an up-converted emission demonstrating that excitons gaining energy in non-radiative Auger processes can be recovered and recombine radiatively.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorGeim, Andre
dc.contributor.authorFalko, Vladimir
dc.contributor.authorDanovich, Mark
dc.contributor.authorFaugeras, Clement
dc.contributor.authorWatanabe, Kenji
dc.contributor.authorTaniguchi, Takashi
dc.contributor.authorBinder, Johannes
dc.contributor.authorWysmołek, Andrzej
dc.contributor.authorPotemski, Marek
dc.contributor.authorKozikov, Aleksey
dc.contributor.authorNovoselov, Kostya
dc.contributor.authorWithers, Fredd
dc.contributor.authorHowarth, James
dc.contributor.authorMolas, Maciej
dc.date.accessioned2024-01-26T11:20:19Z
dc.date.available2024-01-26T11:20:19Z
dc.date.copyright2019-05-27
dc.date.issued2019
dc.description.accesstimeAT_PUBLICATION
dc.description.financeNie dotyczy
dc.description.versionFINAL_PUBLISHED
dc.identifier.doi10.1038/S41467-019-10323-9
dc.identifier.issn2041-1723
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/124277
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofNature Communications
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleUpconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
dc.typeJournalArticle
dspace.entity.typePublication