Room temperature nanocavity laser with interlayer excitons in 2D heterostructures

Atomically thin layered two dimensional (2D) material has provided a rich library for both fundamental research and device applications. One of the special advantages is that, bandgap engineering and controlled material response can be achieved by stacking different 2D materials. Recently several ty...

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Bibliographic Details
Published inarXiv.org
Main Authors Liu, Yuanda, Hanlin Fang, Abdullah Rasmita, Zhou, Yu, Li, Juntao, Yu, Ting, Xiong, Qihua, Zheludev, Nikolay, Liu, Jin, Gao, Weibo
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 28.11.2019
Subjects
Coherent light
Collapse
Emission
Energy gap
Excitons
Heterostructures
Infrared lasers
Interlayers
Lasers
Light sources
Molybdenum disulfide
Monolayers
Optical properties
Photonics
Physics - Mesoscale and Nanoscale Physics
Q factors
Room temperature
Silicon
Transition metal compounds
Two dimensional materials
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Summary:Atomically thin layered two dimensional (2D) material has provided a rich library for both fundamental research and device applications. One of the special advantages is that, bandgap engineering and controlled material response can be achieved by stacking different 2D materials. Recently several types of excitonic lasers have been reported based on Transition metal dichalcogenide (TMDC) monolayers, however, the emission is still the intrinsic energy bandgap of the monolayers and lasers harnessing the flexibility of Van der Waals heterostructures have not been demonstrated yet. Here, we report for the first time a room temperature interlayer exciton laser with MoS2/WSe2 heterostructures. The onset of lasing action was identified by a combination of distinct kink in the 'L-L' curve and the noticeable collapse of spectral linewidth. Different from visible emission of intralayer excitons for both MoS2 and WSe2, our interlayer exciton laser works in the infrared range, which is fully compatible with the well-established technologies in silicon photonics. Thanks to the long lifetime of interlayer excitons, the requirement of the cavity quality factor is relaxed by orders of magnitude. The demonstration of room temperature interlayer exciton laser might open new perspectives for the development of coherent light source with tailored optical properties on silicon photonics platform.
ISSN:2331-8422
DOI:10.48550/arxiv.1911.12629