Observing chiral edge states in gapped nanomechanical
graphene

22nd January 2021by admin0

Edge states are an emerging concept in physics and
have been explored as an efficient strategy to manipulate
electrons, photons and phonons for next-generation hybrid
electro-optomechanical circuits. Scientists have used gapless
chiral edge states in graphene or graphene-like materials to
understand exotic quantum phenomena such as quantum spin or valley
Hall effects. In a new report now published on Science Advances,
Xiang Xi and colleagues reported on experimental chiral edge states
in gapped nanomechanical graphene; a honeycomb lattice of
free-standing silicon nitride nanomechanical membranes with broken
spatial inversion symmetry (presence of a dipole). The constructs
were immune against backscattering in sharp bends and exhibited the
valley-momentum locking effect. The team realized a smooth
transition between the chiral edge states and the well-known valley
kink states to open the door for experimental investigations of
soft graphene-related physics in very-high-frequency, integrated
nanomechanical systems.

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