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Observation of an unpaired photonic Dirac point.

Abstract：

:At photonic Dirac points, electromagnetic waves are governed by the same equations as two-component massless relativistic fermions. However, photonic Dirac points are known to occur in pairs in "photonic graphene" and other similar photonic crystals, which necessitates special precautions to excite only one valley state. Systems hosting unpaired photonic Dirac points are significantly harder to realize, as they require broken time-reversal symmetry. Here, we report on the observation of an unpaired Dirac point in a planar two-dimensional photonic crystal. The structure incorporates gyromagnetic materials, which break time-reversal symmetry; the unpaired Dirac point occurs when a parity-breaking parameter is fine-tuned to a topological transition between a photonic Chern insulator and a conventional photonic insulator phase. Evidence for the unpaired Dirac point is provided by transmission and field-mapping experiments, including a demonstration of strongly non-reciprocal reflection. This unpaired Dirac point may have applications in valley filters and angular selective photonic devices.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu GG,Zhou P,Yang Y,Xue H,Ren X,Lin X,Sun HX,Bi L,Chong Y,Zhang B

doi

10.1038/s41467-020-15801-z

subject

Has Abstract

pub_date

2020-04-20 00:00:00

pages

1873

issue

1

issn

2041-1723

pii

10.1038/s41467-020-15801-z

journal_volume

11

pub_type

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