Bulk and boundary zero-bias anomaly in multiwall carbon nanotubes - art. no. 066401

We compute the tunneling density of states of doped multiwall nanotubes inc luding disorder and electron-electron interactions. A nonconventional Coulo mb blockade reflecting nonperturbative Altshuler-Aronov-Lee power-law zero- bias anomalies is found, in accordance with recent experimental results. Th e presence of a boundary implies a universal doubling of the boundary expon ent in the diffusive limit.