Extracting the Single-Particle Gap in Carbon Nanotubes with Lattice Quantum Monte Carlo Evan Berkowitz, Christopher Körber, Stefan Krieg, Peter Labus, Timo A. Lähde and Thomas Luu EPJ Web Conf., 175 (2018) 03009 Published online: 26 March 2018 DOI: 10.1051/epjconf/201817503009