Mapping the Slow Stabilization of End States with Length along a Laterally Extended Graphene Nanoribbon - Archive ouverte HAL
Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2024

Mapping the Slow Stabilization of End States with Length along a Laterally Extended Graphene Nanoribbon

Résumé

With a lateral bisnaphtho-extended chemical structure, finite 7–13 carbon atom wide armchair graphene nanoribbons (7–13-aGNRs) were on-surface synthesized. For all lengths up to N = 7 monomer units, low-temperature ultrahigh vacuum scanning tunneling spectroscopy and spatial dI/dV maps were recorded at each captured tunneling resonance. The degeneracy of the two central electronic end states (ESs) occurs in a slowly decaying regime with N converging toward zero for N = 6 long 7–13-aGNR (12 bonded anthracenes), while it is N = 2 (4 bonded anthracenes) for seven carbon atoms wide armchair GNRs (7-aGNRs). The two end dI/dV conductance maxima of ESs are also shifted away from strictly two ends of the 7–13-aGNR compared to the 7-aGNR. Using the quantum topology graph filiation between finite length polyacetylene and 7–13-aGNRs wires, we show that this slow decay of 7–13-aGNR ESs is coming from the property of the topological Hückel band matrix that expels the ESs into its eigenvalue spectrum gaps to keep harmony in the core spectrum.
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Dates et versions

hal-04698481 , version 1 (25-09-2024)

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Umamahesh Thupakula, We-Hyo Soe, Jesús Castro-Esteban, Afnan Al Saati, Georges Trinquier, et al.. Mapping the Slow Stabilization of End States with Length along a Laterally Extended Graphene Nanoribbon. Journal of Physical Chemistry Letters, 2024, 15 (35), pp.8933-8941. ⟨10.1021/acs.jpclett.4c02256⟩. ⟨hal-04698481⟩
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