Valley controlled propagation of pseudospin states in bulk metacrystal waveguides

Abstract

Light manipulations such as spin-direction locking propagation, robust transport, quantum teleportation and reconfigurable electromagnetic pathways have been investigated at the boundaries of photonic systems. Recently by breaking Dirac cones in time-reversal invariant photonic crystals, valley-pseudospin coupled edge states have been employed to realize selective propagation of light. Here, without photonic boundaries, we realize the propagation of pseudospin states in three-dimensional bulk metacrystal waveguides by employing the ubiquitous valley degree of freedom. Valley-dependent pseudospin bands are achieved in three-dimensional metacrystal waveguides without Dirac cones. Reconfigurable photonic valley Hall effect is proposed after studying the variation of pseudospin states near K' and K valleys. Moreover, a prototype of photonic blocker is realized by cascading two inversion asymmetric metacrystal waveguides in which the pseudospin direction locking propagation exists. In addition, valley-dependent pseudospin bands are also discussed in a realistic metamaterials sample. These results show an alternative way towards molding the pseudospin flow in photonic systems.

arXiv comment26 pages, 7 figures

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• Higher-order valley vortices enabled by synchronized rotation in a photonic crystal
• Rabi-like oscillation of photonic topological valley Hall edge states
• Topological transition in spiral elastic valley metamaterials
• Valley-dependent topological edge states in plasma photonic crystals
• Spin-valley-controlled photonic topological insulator
• Topologically Protected Photonic Modes in Composite Quantum Hall/Quantum Spin Hall Waveguides