Left/right asymmetry in Dyakonov–Tamm-wave propagation guided by a topological insulator and a structurally chiral material

Francesco Chiadini, Vincenzo Fiumara, Tom G Mackay, Antonio Scaglione, Akhlesh Lakhtakia

Research output: Contribution to journalArticlepeer-review

Abstract

The propagation of Dyakonov–Tamm waves guided by the planar interface of an isotropic topological insulator and a structurally chiral material, both assumed to be nonmagnetic, was investigated by numerically solving the associated canonical boundary-value problem. The topologically insulating surface states of the topological insulator were quantitated via a surface admittance ${\gamma }_{{\rm{TI}}}$, which significantly affects the phase speeds and the spatial profiles of the Dyakonov–Tamm waves. Most significantly, it is possible that a Dyakonov–Tamm wave propagates co-parallel to a vector ${\bf{u}}$ in the interface plane, but no Dyakonov–Tamm wave propagates anti-parallel to ${\bf{u}}$. The left/right asymmetry, which vanishes for ${\gamma }_{{\rm{TI}}}=0$, is highly attractive for one-way on-chip optical communication.
Original languageEnglish
Article number115101
Number of pages10
JournalJournal of optics
Volume18
Issue number11
DOIs
Publication statusPublished - 23 Sep 2016

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