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Self-assembled topological materials: Weyl points for light and sound

Michel Fruchart (Leiden University, Leiden, Allemagne)
When Apr 26, 2018
from 01:30 PM to 02:30 PM
Where amphithéâtre F
Attendees Michel Fruchart
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Jeudi 26 Avril

 

Title: Self-assembled topological materials: Weyl points for light and sound

Michel Fruchart (Leiden University, Leiden, Allemagne)

 

Abstract:  Soft materials such as liquid crystals, block copolymers, or colloidal particles can self-assemble into highly structured phases which replicate at the mesoscopic scale the symmetry of atomic crystals. As such, they offer an unparalleled platform to design mesostructured materials for light and sound. Here, we present a bottom-up approach based on self-assembly to engineer three-dimensional photonic and phononic crystals with topologically protected Weyl points. In addition to angular and frequency selectivity of their bulk optical response, Weyl materials are endowed with topological surface states, which allows for the existence of one-way channels even in the presence of time-reversal invariance. Using a combination of group-theoretical methods and numerical simulations, we identify the general symmetry constraints that a self-assembled structure has to satisfy in order to host Weyl points, and describe how to achieve such constraints using a symmetry-driven pipeline for self-assembled material design and discovery.