title: Possible anomalous spin dynamics of the Hubbard model on a honeycomb lattice.
abstract: In this paper, the Hubbard model on a honeycomb lattice is investigated by using an O(3) nonlinear σ model. A possible candidate for a quantum non-magnetic insulator in a narrow parameter region is found near the metal-insulator transition. After studying the magnetic properties of the quantum non-magnetic insulator, anomalous spin dynamics is shown. In addition, we find that this region could be widened by hole doping.
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, People's Republic of China.
authors.forename: Gao-Yong
authors.initials: GY
authors.lastname: Sun
authors.forename: Su-Peng
authors.initials: SP
authors.lastname: Kou