Experimental observation of photonic nodal line degeneracies in metacrystals

Research output: Contribution to journalArticlepeer-review

Standard

Experimental observation of photonic nodal line degeneracies in metacrystals. / Gao, Wenlong; Yang, Biao; Tremain, Ben; Liu, Hongchao; Guo, Qinghua; Xia, Lingbo; Hibbins, Alastair P.; Zhang, Shuang.

In: Nature Communications, Vol. 9, 950, 05.03.2018.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

Gao, Wenlong ; Yang, Biao ; Tremain, Ben ; Liu, Hongchao ; Guo, Qinghua ; Xia, Lingbo ; Hibbins, Alastair P. ; Zhang, Shuang. / Experimental observation of photonic nodal line degeneracies in metacrystals. In: Nature Communications. 2018 ; Vol. 9.

Bibtex

@article{8a3f757b93a846efb7a98fb9bfa44cf2,
title = "Experimental observation of photonic nodal line degeneracies in metacrystals",
abstract = "Nodal line semimetals (NLS) are three-dimensional (3D) crystals that support band crossings in the form of one-dimensional rings in the Brillouin zone. In the presence of spin–orbit coupling or lowered crystal symmetry, NLS may transform into Dirac semimetals, Weyl semimetals, or 3D topological insulators. In the photonics context, despite the realization of topological phases, such as Chern insulators, topological insulators, Weyl, and Dirac degeneracies, no experimental demonstration of photonic nodal lines (NLs) has been reported so far. Here, we experimentally demonstrate NL degeneracies in microwave cut-wire metacrystals with engineered negative bulk plasma dispersion. Both the bulk and surface states of the NL metamaterial are observed through spatial Fourier transformations of the scanned near-field distributions. Furthermore, we theoretically show that the NL degeneracy can transform into two Weyl points when gyroelectric materials are incorporated into the metacrystal design. Our findings may inspire further advances in topological photonics.",
keywords = "metamaterials , sub-wavelength optics",
author = "Wenlong Gao and Biao Yang and Ben Tremain and Hongchao Liu and Qinghua Guo and Lingbo Xia and Hibbins, {Alastair P.} and Shuang Zhang",
year = "2018",
month = mar,
day = "5",
doi = "10.1038/s41467-018-03407-5",
language = "English",
volume = "9",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Springer",

}

RIS

TY - JOUR

T1 - Experimental observation of photonic nodal line degeneracies in metacrystals

AU - Gao, Wenlong

AU - Yang, Biao

AU - Tremain, Ben

AU - Liu, Hongchao

AU - Guo, Qinghua

AU - Xia, Lingbo

AU - Hibbins, Alastair P.

AU - Zhang, Shuang

PY - 2018/3/5

Y1 - 2018/3/5

N2 - Nodal line semimetals (NLS) are three-dimensional (3D) crystals that support band crossings in the form of one-dimensional rings in the Brillouin zone. In the presence of spin–orbit coupling or lowered crystal symmetry, NLS may transform into Dirac semimetals, Weyl semimetals, or 3D topological insulators. In the photonics context, despite the realization of topological phases, such as Chern insulators, topological insulators, Weyl, and Dirac degeneracies, no experimental demonstration of photonic nodal lines (NLs) has been reported so far. Here, we experimentally demonstrate NL degeneracies in microwave cut-wire metacrystals with engineered negative bulk plasma dispersion. Both the bulk and surface states of the NL metamaterial are observed through spatial Fourier transformations of the scanned near-field distributions. Furthermore, we theoretically show that the NL degeneracy can transform into two Weyl points when gyroelectric materials are incorporated into the metacrystal design. Our findings may inspire further advances in topological photonics.

AB - Nodal line semimetals (NLS) are three-dimensional (3D) crystals that support band crossings in the form of one-dimensional rings in the Brillouin zone. In the presence of spin–orbit coupling or lowered crystal symmetry, NLS may transform into Dirac semimetals, Weyl semimetals, or 3D topological insulators. In the photonics context, despite the realization of topological phases, such as Chern insulators, topological insulators, Weyl, and Dirac degeneracies, no experimental demonstration of photonic nodal lines (NLs) has been reported so far. Here, we experimentally demonstrate NL degeneracies in microwave cut-wire metacrystals with engineered negative bulk plasma dispersion. Both the bulk and surface states of the NL metamaterial are observed through spatial Fourier transformations of the scanned near-field distributions. Furthermore, we theoretically show that the NL degeneracy can transform into two Weyl points when gyroelectric materials are incorporated into the metacrystal design. Our findings may inspire further advances in topological photonics.

KW - metamaterials

KW - sub-wavelength optics

U2 - 10.1038/s41467-018-03407-5

DO - 10.1038/s41467-018-03407-5

M3 - Article

VL - 9

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 950

ER -