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Article

Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides

by 1,2 and 1,2,3,4,*
1
Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, USA
2
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA
3
Physics Program, Graduate Center, City University of New York, New York, NY 10026, USA
4
Department of Electrical Engineering, City College of New York, New York, NY 10031, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(7), 1157; https://doi.org/10.3390/app8071157
Received: 29 May 2018 / Revised: 12 July 2018 / Accepted: 13 July 2018 / Published: 17 July 2018
(This article belongs to the Special Issue Nano-Antennas)
Monolayer (1L) transition-metal dichalcogenides (TMDCs) are attractive materials for several optoelectronic applications because of their strong excitonic resonances and valley-selective response. Valley excitons in 1L-TMDCs are formed at opposite points of the Brillouin zone boundary, giving rise to a valley degree of freedom that can be treated as a pseudospin, and may be used as a platform for information transport and processing. However, short valley depolarization times and relatively short exciton lifetimes at room temperature prevent using valley pseudospins in on-chip integrated valley devices. Recently, it was demonstrated how coupling these materials to optical nanoantennas and metasurfaces can overcome this obstacle. Here, we review the state-of-the-art advances in valley-selective directional emission and exciton sorting in 1L-TMDC mediated by nanostructures and nanoantennas. We briefly discuss the optical properties of 1L-TMDCs paying special attention to their photoluminescence/absorption spectra, dynamics of valley depolarization, and the valley Hall effect. Then, we review recent works on nanostructures for valley-selective directional emission from 1L-TMDCs. View Full-Text
Keywords: monolayer transition-metal dichalcogenides; valley-selective response; valley excitons; valley Hall effect monolayer transition-metal dichalcogenides; valley-selective response; valley excitons; valley Hall effect
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MDPI and ACS Style

Krasnok, A.; Alù, A. Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides. Appl. Sci. 2018, 8, 1157. https://doi.org/10.3390/app8071157

AMA Style

Krasnok A, Alù A. Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides. Applied Sciences. 2018; 8(7):1157. https://doi.org/10.3390/app8071157

Chicago/Turabian Style

Krasnok, Alexander, and Andrea Alù. 2018. "Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides" Applied Sciences 8, no. 7: 1157. https://doi.org/10.3390/app8071157

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