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Self-consistent tight-binding description of Dirac points moving and merging in two-dimensional optical lattices

AutorIbañez-Azpiroz, Julen; Eiguren, Asier; Bergara, Aitor ; Pettini, Giulio; Modugno, Michele
Fecha de publicación2013
EditorAmerican Physical Society
CitaciónPhysical Review A 88: 033631 (2013)
ResumenWe present an accurate ab initio tight-binding model, capable of describing the dynamics of Dirac points in tunable honeycomb optical lattices following a recent experimental realization. Our scheme is based on first-principle maximally localized Wannier functions for composite bands. The tunneling coefficients are calculated for different lattice configurations, and the spectrum properties are well reproduced with high accuracy. In particular, we show which tight-binding description is needed in order to accurately reproduce the position of Dirac points and the dispersion law close to their merging, for different laser intensities. © 2013 American Physical Society.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevA.88.033631
URIhttp://hdl.handle.net/10261/102403
DOI10.1103/PhysRevA.88.033631
Identificadoresdoi: 10.1103/PhysRevA.88.033631
issn: 1050-2947
e-issn: 1094-1622
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