PT-symmetry in honeycomb photonic lattices
Alexander Szameit, Mikael C. Rechtsman, Omri Bahat-Treidel, and, Mordechai Segev
TL;DR
This paper explores PT-symmetry in honeycomb photonic lattices, revealing tachyon-like dispersion relations and demonstrating how lattice deformation can restore PT-symmetry, with implications for controlling light propagation.
Contribution
It introduces the concept of tachyon-like dispersion in honeycomb photonic lattices with gain/loss and shows how lattice deformation restores PT-symmetry.
Findings
Dispersion relation mimics tachyons with imaginary mass
PT-symmetry breaking occurs in the structure
Lattice deformation can restore PT-symmetry
Abstract
We apply gain/loss to honeycomb photonic lattices and show that the dispersion relation is identical to tachyons - particles with imaginary mass that travel faster than the speed of light. This is accompanied by PT-symmetry breaking in this structure. We further show that the PT-symmetry can be restored by deforming the lattice.
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