Out-of-plane orientation of luminescent excitons in two-dimensional indium selenideVisa övriga samt affilieringar
2019 (Engelska)Ingår i: Nature Communications, E-ISSN 2041-1723, Vol. 10, artikel-id 3913Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
Van der Waals materials offer a wide range of atomic layers with unique properties that can be easily combined to engineer novel electronic and photonic devices. A missing ingredient of the van der Waals platform is a two-dimensional crystal with naturally occurring out-of-plane luminescent dipole orientation. Here we measure the far-field photoluminescence intensity distribution of bulk InSe and two-dimensional InSe, WSe2 and MoSe2. We demonstrate, with the support of ab-initio calculations, that layered InSe flakes sustain luminescent excitons with an intrinsic out-of-plane orientation, in contrast with the in-plane orientation of dipoles we find in two-dimensional WSe2 and MoSe2 at room-temperature. These results, combined with the high tunability of the optical response and outstanding transport properties, position layered InSe as a promising semiconductor for novel optoelectronic devices, in particular for hybrid integrated photonic chips which exploit the out-of-plane dipole orientation.
Ort, förlag, år, upplaga, sidor
Springer Nature , 2019. Vol. 10, artikel-id 3913
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
URN: urn:nbn:se:kth:diva-259420DOI: 10.1038/s41467-019-11920-4ISI: 000483305400004PubMedID: 31477714Scopus ID: 2-s2.0-85071752850OAI: oai:DiVA.org:kth-259420DiVA, id: diva2:1353950
Anmärkning
QC 20220503
2019-09-242019-09-242023-03-28Bibliografiskt granskad