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Suppression of Grain Boundaries in Graphene Growth on Superstructured Mn-Cu(111) Surface
Wei Chen, Hua Chen, Haiping Lan +4
As undesirable defects, grain boundaries (GBs) are widespread in epitaxial graphene using existing growth methods on metal substrates. Employing density functional theory calculati…
Interaction Driven Quantum Phase Transitions in Fractional Topological Insulators
Hua Chen, Kun Yang
We study two species of (or spin-1/2) fermions with short-range intra-species repulsion in the presence of opposite (effective) magnetic field, each at Landau level filling factor…
CO Oxidation Facilitated by Robust Surface States on Au-Covered Topological Insulators
Hua Chen, Wenguang Zhu, Di Xiao +1
Surface states refer to electronic states emerging as a solid material terminates at a surface, and can be present in many systems. Despite their spatial proximity to material surf…
Topological insulators with perfect vacancy superstructure and possible implications for iron chalcogenide superconductors
Xiao-Yong Feng, Hua Chen, Chao Cao +1
Motivated by the newly-discovered intercalated iron chalcogenide superconductors, we construct a single orbital tight-binding model for topological insulators on the square lattice…
Block spin magnetism and metal-insulator transition in a two-dimensional Hubbard model with perfect vacancy superstructure
Hua Chen, Chao Cao, Jianhui Dai
We study the phase diagram of a square lattice Hubbard model with a perfect vacancy superstructure. The model can be also defined on a new bipartite lattice with each building bloc…