  Here we present a flexible strategy to realize robust nanomaterials
exhibiting valence electronic structures whose fundamental physics is described
by the SSH-Hamiltonian. These solid-state materials are realized using
atomically precise graphene nanoribbons (GNR). We demonstrate the controlled
periodic coupling of topological boundary states at junctions of armchair GNRs
of different widths to create quasi-1D trivial and non-trivial electronic
quantum phases. Their topological class is experimentally determined by drawing
upon the bulk-boundary correspondence and measuring the presence (non-trivial)
or absence (trivial) of localized end states by scanning tunneling spectroscopy
(STS). The strategy we propose has the potential to tune the band width of the
topological electronic bands close to the energy scale of proximity induced
spin-orbit coupling or superconductivity, and may allow the realization of
Kitaev like Hamiltonians and Majorana type end states.
