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 simulat...

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Bibliographic Details
Published in:arXiv.org 2019-04
Main Authors: Ran Gladstein Gladstone, Jung, Minwoo, Han, Yuchen, Shvets, Gennady
Format: Article
Language:English
Subjects:
Antiferromagnetism
Computer simulation
Domain walls
First principles
Group velocity
Mathematical models
Metamaterials
Photonics
Propagation
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 a single parameter controls the propagation properties of the chiral states at the domain wall between two SV-PTIs: their group velocity, polarization, and the existence/absence of topological protection. The latter is determined by the geometry of the line of the least frequency separation between the bandgap-forming propagation bands. Topologically-protected compression of electromagnetic energy via group velocity control is enabled by SV-PTIs.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.02819