▎ 摘　　要

The Chem numbers which correspond to quantized Hall conductance sigma(xy) were calculated for single- and bi-layer honeycomb lattices. The quantization of sigma(xy) occurs in entire energy range. Several large jumps of Chem numbers appear at van-Hove singularities of energy bands without magnetic fields. The plateaux of sigma(xy) are discussed from semi-classical quantization. (C) 2009 Elsevier B.V. All rights reserved.