Inducing room-temperature valley polarization in transition metal dichalcogenide monolayers

Publikation: Konferencebidrag uden forlag/tidsskriftPosterForskning


The lowest energy states in transition metal dichalcogenide (TMD) monolayers follow valley selection rules, which have attracted vast interest due to the possibility of encoding and processing of quantum information. However, these quantum states are strongly affected by temperature-dependent intervalley scattering leading to complete valley depolarization, which hampers any practical applications of TMD monolayers at room temperature. Therefore, for achieving clear and robust valley polarization in TMD monolayers one needs to suppress parasitic depolarization processes, which is the central challenge in the growing field of valleytronics. Here, in electron-doping experiments on TMD monolayers, we demonstrate that strong doping levels beyond 10^13 cm-2 can induce 61% and 37% valley contrast at room temperature in tungsten diselenide and molybdenum diselenide monolayers, respectively. Our results indicate that charged excitons in TMD monolayers can be utilized as quantum units in designing of practical valleytronic devices operating at 300 K.
Publikationsdato22. nov. 2023
StatusUdgivet - 22. nov. 2023
BegivenhedNANOP 2023: Functional Nanophotonics - Pompeu Fabra University – Balmes building, Barcelona, Spanien
Varighed: 27. nov. 202329. nov. 2023


KonferenceNANOP 2023: Functional Nanophotonics
LokationPompeu Fabra University – Balmes building


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