  This comprehensive study investigates charge transport through the multiple
end zigzag edge states of finite-size armchair graphene nanoribbons/boron
nitride nanoribbons (n-AGNR/w-BNNR) junctions under a longitudinal electric
field, where n and w denote the widths of the AGNRs and the BNNRs,
respectively. In 13-atom wide AGNR segments, the edge states exhibit a blue
Stark shift in response to the electric field, with only the long decay length
zigzag edge states showing significant interaction with the red Stark shift
subband states. Charge tunneling through such edge states assisted by the
subband states is elucidated in the spectra of the transmission coefficient. In
the 13-AGNR/6-BNNR heterojunction, notable influences on the energy levels of
the end zigzag edge states of 13-AGNRs induced by BNNR segments are observed.
We demonstrate the modulation of these energy levels in resonant tunneling
situations, as depicted by bias-dependent transmission coefficient spectra.
Intriguing nonthermal broadening of tunneling current shows a significant
peak-to-valley ratio. Our findings highlight the promising potential of
n-AGNR/w-BNNR heterojunctions with long decay length edge states in the realm
of GNR-based single electron transistors at room temperature.
