Photonic emulation of two-dimensional materials with antiferromagnetic order

We introduce an electromagnetic metamaterial-a spin-valley photonic topological insulator (SV-PTI)-that emulates a wide class of theoretically predicted gapped two-dimensional materials with antiferromagnetic order coupled to the valley degree of freedom. First-principles electromagnetic simulations...

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Bibliographic Details
Published in:Physical review. B 2019-12, Vol.100 (24), p.1, Article 245417
Main Authors: Gladstone, Ran Gladstein, Jung, Minwoo, Han, Yuchen, Shvets, Gennady
Format: Article
Language:English
Subjects:
Antiferromagnetism
Computer simulation
Domain walls
First principles
Group velocity
Metamaterials
Photonics
Topological insulators
Two dimensional materials
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Summary:We introduce an electromagnetic metamaterial-a spin-valley photonic topological insulator (SV-PTI)-that emulates a wide class of theoretically predicted gapped two-dimensional materials with antiferromagnetic order coupled to the valley degree of freedom. First-principles electromagnetic simulations and an analytic model reveal that two geometric parameters control the propagation properties of the chiral kink states at the domain wall between two SV-PTIs: their group velocity, polarization, and the existence/absence of topological protection. We demonstrate that a nonuniform SV-PTI structure can compress the electromagnetic energy carried by the kink states.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.245417