Electrically pumped single-defect light emitters in WSe\(_2\)

Recent developments in fabrication of van der Waals heterostructures enable new type of devices assembled by stacking atomically thin layers of two-dimensional materials. Using this approach, we fabricate light-emitting devices based on a monolayer WSe\(_2\), and also comprising boron nitride tunnel...

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Veröffentlicht in:arXiv.org 2016-05
Hauptverfasser: Schwarz, S, Kozikov, A, Withers, F, Maguire, J K, Foster, A P, Dufferwiel, S, Hague, L, Makhonin, M N, Wilson, L R, Geim, A K, Novoselov, K S, Tartakovskii, A I
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Sprache:eng
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Zusammenfassung:Recent developments in fabrication of van der Waals heterostructures enable new type of devices assembled by stacking atomically thin layers of two-dimensional materials. Using this approach, we fabricate light-emitting devices based on a monolayer WSe\(_2\), and also comprising boron nitride tunnelling barriers and graphene electrodes, and observe sharp luminescence spectra from individual defects in WSe\(_2\) under both optical and electrical excitation. This paves the way towards the realization of electrically-pumped quantum emitters in atomically thin semiconductors. In addition we demonstrate tuning by more than 1 meV of the emission energy of the defect luminescence by applying a vertical electric field. This provides an estimate of the permanent electric dipole created by the corresponding electron-hole pair. The light-emitting devices investigated in our work can be assembled on a variety of substrates enabling a route to integration of electrically pumped single quantum emitters with existing technologies in nano-photonics and optoelectronics.
ISSN:2331-8422
DOI:10.48550/arxiv.1605.01921