Nonlinear Dirac Points and topological invariant in coupled hexagonal lattices
Abstract
Topological phases and materials have attracted much attention in recent years. Though many progress has been made, the effect of nonlinearity on such system remains untouched. In this paper, by considering the mean-field approximation in a coupled boson-hexagonal lattice system, we obtain a different type of Dirac cone. Due to its special structure of the cone, the Berry phase (two-dimensional Zak phase) of this new Dirac cone is quantized differently, i.e., it has been modified due to the interactions and the critical line between different topological phases has moved, depending on the type of interactions. Furthermore, the new Berry phase is found to be quantized, offering a possible nonlinear topological invariant which can supply as a criterion of topological classification for that interacting system. The quantum phase transition in terms of this criterion in the system has also been examined.
Keywords
Cite
@article{arxiv.2007.01105,
title = {Nonlinear Dirac Points and topological invariant in coupled hexagonal lattices},
author = {Fude Li and X. X. Yi},
journal= {arXiv preprint arXiv:2007.01105},
year = {2020}
}
Comments
We withdraw this submission due to technical errors in Figures. To be specific, some sentences in our paper are misleading and we need to make some corrections to our figures, such as Fig.2, Fig.4 and Fig.5, as well as technical details in the Sec.3