Localisation-to-delocalisation transition of moiré excitons in WSe2/MoSe2 heterostructures

Elena Blundo (), Federico Tuzi, Salvatore Cianci, Marzia Cuccu, Katarzyna Olkowska-Pucko, Łucja Kipczak, Giorgio Contestabile, Antonio Miriametro, Marco Felici, Giorgio Pettinari, Takashi Taniguchi, Kenji Watanabe, Adam Babiński, Maciej R. Molas and Antonio Polimeni ()
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Elena Blundo: Sapienza University of Rome
Federico Tuzi: Sapienza University of Rome
Salvatore Cianci: Sapienza University of Rome
Marzia Cuccu: Sapienza University of Rome
Katarzyna Olkowska-Pucko: University of Warsaw
Łucja Kipczak: University of Warsaw
Giorgio Contestabile: Sapienza University of Rome
Antonio Miriametro: Sapienza University of Rome
Marco Felici: Sapienza University of Rome
Giorgio Pettinari: National Research Council
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Adam Babiński: University of Warsaw
Maciej R. Molas: University of Warsaw
Antonio Polimeni: Sapienza University of Rome

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Moiré excitons (MXs) are electron-hole pairs localised by the periodic (moiré) potential forming in two-dimensional heterostructures (HSs). MXs can be exploited, e.g., for creating nanoscale-ordered quantum emitters and achieving or probing strongly correlated electronic phases at relatively high temperatures. Here, we studied the exciton properties of WSe2/MoSe2 HSs from T = 6 K to room temperature using time-resolved and continuous-wave micro-photoluminescence also under a magnetic field. The exciton dynamics and emission lineshape evolution with temperature show clear signatures that MXs de-trap from the moiré potential and turn into free interlayer excitons (IXs) for temperatures above 100 K. The MX-to-IX transition is also apparent from the exciton magnetic moment reversing its sign when the moiré potential is not capable of localising excitons at elevated temperatures. Concomitantly, the exciton formation and decay times reduce drastically. Thus, our findings establish the conditions for a truly confined nature of the exciton states in a moiré superlattice with increasing temperature and photo-generated carrier density.

Date: 2024
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DOI: 10.1038/s41467-024-44739-9

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