Lasing of moiré trapped MoSe2/WSe2 interlayer excitons coupled to a nanocavity

Chenjiang Qian, Mirco Troue, Johannes Figueiredo, Pedro Soubelet, Viviana Villafañe, Johannes Beierlein, Sebastian Klembt, Andreas V. Stier, Sven Höfling, Alexander W. Holleitner, Jonathan J. Finley

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Abstract

We report lasing of moiré trapped interlayer excitons (IXs) by integrating a pristine hBN-encapsulated MoSe2/ WSe2 heterobilayer into a high-Q (>104) nanophotonic cavity. We control the cavity-IX detuning using a magnetic field and measure their dipolar coupling strength to be 78 ± 4 micro–electron volts, fully consistent with the 82 micro–electron volts predicted by theory. The emission from the cavity mode shows clear threshold-like behavior as the transition is tuned into resonance with the cavity. We observe a superlinear power dependence accompanied by a narrowing of the linewidth as the distinct features of lasing. The onset and prominence of these threshold-like behaviors are pronounced at resonance while weak off-resonance. Our results show that a lasing transition can be induced in interacting moiré IXs with macroscopic coherence extending over the length scale of the cavity mode. Such systems raise interesting perspectives for low-power switching and synaptic nanophotonic devices using two-dimensional materials.

Original languageEnglish
Article numbereadk6359
JournalScience Advances
Volume10
Issue number2
DOIs
StatePublished - Jan 2024

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