Superradiant Emission from Coherent Excitons in van Der Waals Heterostructures |
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Authors: | Golam Haider Krishna Sampathkumar Tim Verhagen Luká? Nádvorník Farjana J Sonia Václav Vale? Jan Sýkora Peter Kapusta Petr Němec Martin Hof Otakar Frank Yang-Fang Chen Jana Vejpravová Martin Kalbá? |
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Affiliation: | 1. J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences, Dolej?kova 2155/3, Prague, 18223 8 Czech Republic;2. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague, 121 16 2 Czech Republic;3. Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, Prague, 121 16 2 Czech Republic;4. Department of Physics, National Taiwan University, No. 1, Section 4, Roosevelt Rd, Taipei, 10617 Taiwan |
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Abstract: | Recent advancements in isolation and stacking of layered van der Waals materials have created an unprecedented paradigm for demonstrating varieties of 2D quantum materials. Rationally designed van der Waals heterostructures composed of monolayer transition-metal dichalcogenides (TMDs) and few-layer hBN show several unique optoelectronic features driven by correlations. However, entangled superradiant excitonic species in such systems have not been observed before. In this report, it is demonstrated that strong suppression of phonon population at low temperature results in a formation of a coherent excitonic-dipoles ensemble in the heterostructure, and the collective oscillation of those dipoles stimulates a robust phase synchronized ultra-narrow band superradiant emission even at extremely low pumping intensity. Such emitters are in high demand for a multitude of applications, including fundamental research on many-body correlations and other state-of-the-art technologies. This timely demonstration paves the way for further exploration of ultralow-threshold quantum-emitting devices with unmatched design freedom and spectral tunability. |
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Keywords: | coherent excitons low temperature photon correlation superradiance van-der Waals heterostructures |
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