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(3+1)-dimensional topological quantum field theory from a tight-binding model of interacting spinless fermions

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Figure

FIG. 1:The tight-binding model, where spinless fermionstion ashas couplinghave coupling purely imaginary staggering term in thei.e.tunnel along the lattice via Hamiltonian (1)
FIG. 2: Energy bands for the full model described in Eq.(1) as a function of the momentum variable pz for fixedpx = py = 0, in arbitrary units
FIG. 3: Phase diagram of Hamiltonian (1) as a function of thecouplingsseparated by phase transition (blue lines) from the topologi-cally trivial regions withνregions with non-trivial winding number δt and t¯ parameterised by the phase φ
FIG. 4: Adiabatic elimination of a Fermi point. The energyspectrum (in arbitrary units) of the model described by thepossible to work in a regime whereHamiltonian in Eq

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