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Title: Valley photonic crystals for control of spin and topology

Abstract

Photonic crystals offer unprecedented opportunity for light manipulation and applications in optical communication and sensing1,2,3,4. Exploration of topology in photonic crystals and metamaterials with non-zero gauge field has inspired a number of intriguing optical phenomena such as one-way transport and Weyl points5,6,7,8,9,10. Recently, a new degree of freedom, valley, has been demonstrated in two-dimensional materials11,12,13,14,15. Here, we propose a concept of valley photonic crystals with electromagnetic duality symmetry but broken inversion symmetry. We observe photonic valley Hall effect originating from valley-dependent spin-split bulk bands, even in topologically trivial photonic crystals. Valley–spin locking behaviour results in selective net spin flow inside bulk valley photonic crystals. We also show the independent control of valley and topology in a single system that has been long pursued in electronic systems, resulting in topologically-protected flat edge states. Valley photonic crystals not only offer a route towards the observation of non-trivial states, but also open the way for device applications in integrated photonics and information processing using spin-dependent transportation.

Authors:
ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1388661
DOE Contract Number:  
SC0001293
Resource Type:
Journal Article
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 16; Journal Issue: 3; Related Information: LMI partners with California Institute of Technology (lead); Harvard University; University of Illinois, Urbana-Champaign; Lawrence Berkeley National Laboratory; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solar (photovoltaic), solid state lighting, phonons, thermal conductivity, electrodes - solar, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly)

Citation Formats

Dong, Jian-Wen, Chen, Xiao-Dong, Zhu, Hanyu, Wang, Yuan, and Zhang, Xiang. Valley photonic crystals for control of spin and topology. United States: N. p., 2016. Web. doi:10.1038/nmat4807.
Dong, Jian-Wen, Chen, Xiao-Dong, Zhu, Hanyu, Wang, Yuan, & Zhang, Xiang. Valley photonic crystals for control of spin and topology. United States. doi:10.1038/nmat4807.
Dong, Jian-Wen, Chen, Xiao-Dong, Zhu, Hanyu, Wang, Yuan, and Zhang, Xiang. Mon . "Valley photonic crystals for control of spin and topology". United States. doi:10.1038/nmat4807.
@article{osti_1388661,
title = {Valley photonic crystals for control of spin and topology},
author = {Dong, Jian-Wen and Chen, Xiao-Dong and Zhu, Hanyu and Wang, Yuan and Zhang, Xiang},
abstractNote = {Photonic crystals offer unprecedented opportunity for light manipulation and applications in optical communication and sensing1,2,3,4. Exploration of topology in photonic crystals and metamaterials with non-zero gauge field has inspired a number of intriguing optical phenomena such as one-way transport and Weyl points5,6,7,8,9,10. Recently, a new degree of freedom, valley, has been demonstrated in two-dimensional materials11,12,13,14,15. Here, we propose a concept of valley photonic crystals with electromagnetic duality symmetry but broken inversion symmetry. We observe photonic valley Hall effect originating from valley-dependent spin-split bulk bands, even in topologically trivial photonic crystals. Valley–spin locking behaviour results in selective net spin flow inside bulk valley photonic crystals. We also show the independent control of valley and topology in a single system that has been long pursued in electronic systems, resulting in topologically-protected flat edge states. Valley photonic crystals not only offer a route towards the observation of non-trivial states, but also open the way for device applications in integrated photonics and information processing using spin-dependent transportation.},
doi = {10.1038/nmat4807},
journal = {Nature Materials},
issn = {1476-1122},
number = 3,
volume = 16,
place = {United States},
year = {2016},
month = {11}
}

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