  We investigate the role played by electron traps on adiabatic charge
transport for graphene nanoribbons in the presence of an acoustically induced
longitudinal surface acoustic wave (SAW) potential. Due to the weak
longitudinal SAW-induced potential as well as the strong transverse confinement
by a nanoribbon, minibandsof sliding tunnel-coupled quantum dots are formed so
that by varying the chemical potential to pass through the minigaps, quantized
adiabatic charge transport may be obtained. We analyze the way that the
minigaps may be closed, thereby destroying the likelihood of current
quantization in a nanoribbon. We present numerical calculations showing the
effects due to electron traps which lead to localized-trap energy levels within
the minigaps. Additionally, for comparison, we present results for the
minibands of a corrugated nanoribbon in the absence of a SAW.
