Prolonged dephasing time of ensemble of moiré-trapped interlayer excitons in WSe2-MoSe2 heterobilayers

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buir.contributor.authorDurmuş, Mehmet Atıf
buir.contributor.authorDemiralay, Kaan
buir.contributor.authorKhan, Muhammad Mansoor
buir.contributor.authorAtalay, Şeyma Esra
buir.contributor.authorSarpkaya, İbrahim
buir.contributor.orcidDurmuş, Mehmet Atıf|0009-0003-7553-3522
buir.contributor.orcidSarpkaya, Ibrahim|0000-0002-1181-6174
buir.contributor.orcidAtalay, Şeyma Esra|0009-0008-6423-4523
buir.contributor.orcidSarpkaya, İbrahim|0000-0002-1181-6174
dc.citation.epage65-8en_US
dc.citation.issueNumber1
dc.citation.spage65-1
dc.citation.volumeNumber7
dc.contributor.authorDurmuş, Mehmet Atıf
dc.contributor.authorDemiralay, Kaan
dc.contributor.authorKhan, Muhammad Mansoor
dc.contributor.authorAtalay, Şeyma Esra
dc.contributor.authorSarpkaya, Ibrahim
dc.date.accessioned2024-03-21T17:44:29Z
dc.date.available2024-03-21T17:44:29Z
dc.date.issued2023-09-11
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)
dc.description.abstractThe moiré superlattices of transition metal dichalcogenide heterobilayers have a pronounced effect on the optical properties of interlayer excitons (IXs) and have been intensively studied in recent years. However, the impact of moiré potentials on the temporal coherence of the IXs has not yet been investigated in detail. Here, we systematically investigate the coherence properties of both the ensemble of delocalized and the ensemble of localized IXs trapped in moiré potentials of the hexagonal boron nitride encapsulated WSe2-MoSe2 heterostructures. Our low-temperature first-order correlation measurements show that prolonged T 2 dephasing times with values up to 730 fs can be obtained from the ensemble of localized IXs under moderate pump powers. We observed up to almost a five-fold increase over the values we obtained from the delocalized IXs, while more than two-fold over the previously reported values of T 2 ~ 300 fs from the delocalized IXs. The prolonged values of T 2 dephasing times and narrow photoluminescence (PL) linewidths for the ensemble of moiré-trapped IXs compared to delocalized one indicate that dephasing mechanisms caused by exciton-low energy acoustic phonon and exciton-exciton scattering are significantly suppressed due to the presence of localization potentials. Our pump power-dependent T 2 results show that ultra-long dephasing times can be expected if the dephasing time measurements are performed with the narrow photoluminescence emission line of a single moiré-trapped IX at a low pump power regime. The prolonged values of IX dephasing times would be critical for the applications of quantum information science and the development of two-dimensional material-based nanolasers. © 2023, Springer Nature Limited.
dc.identifier.doi10.1038/s41699-023-00429-6
dc.identifier.eissn2397-7132
dc.identifier.urihttps://hdl.handle.net/11693/115058
dc.language.isoen_US
dc.publisherNature Research
dc.relation.isversionofhttps://dx.doi.org/10.1038/s41699-023-00429-6
dc.rightsCC BY 4.0 DEED (Attribution 4.0 International)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.source.titlenpj 2D Materials and Applications
dc.titleProlonged dephasing time of ensemble of moiré-trapped interlayer excitons in WSe2-MoSe2 heterobilayers
dc.typeArticle

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Institute of Materials Science and Nanotechnology (UNAM)