Next Article in Journal
Di-Chromatic InGaN Based Color Tuneable Monolithic LED with High Color Rendering Index
Previous Article in Journal
A Novel Method for Assessing Regional Tendon Stiffness and Its Significance
Previous Article in Special Issue
Quantum Antenna as an Open System: Strong Antenna Coupling with Photonic Reservoir
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Appl. Sci. 2018, 8(7), 1157; https://doi.org/10.3390/app8071157

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

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.
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)
Full-Text   |   PDF [2011 KB, uploaded 17 July 2018]   |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Krasnok, A.; Alù, A. Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides. Appl. Sci. 2018, 8, 1157.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top