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Tight binding models for high temperature superconductors


This page lists a set of tight-binding models that are suitable to describe high temperature superconductors

Some of the models have been compiled from the literature for comparison, others are calculated using first principles calculations or adjusted to match experimental measured quantities.
For each model, the hopping parameters are given in a comma separated file (csv), and basic plots of the band structure and Fermi surface are provided for comparison. The tight-binding file contains lines with the following format:
rx, ry, rz, a, b, Re(t), Im(t)
Here ri is the i-th component of the real space vector that describes the hopping process, a and b are integer numbers labeling the orbitals and the last two entries are the real and imaginary part of the hopping (usually given in eV).
The corresponding Bloch Hamiltonian (in orbital representation) can be obtained by a Fourier transform and summation over all lines to yield the matrix Hab.

Models


Directory up
./10band10 band models: Fe-based SC, more accurate when SOC needs to be included
./10band/FeSe_Eschrig
./10band/FeSe_BQPI
./5bandfive band models: applicable for Fe-based SC
./5band/FeSe_monolayer
./5band/Ba122
./5band/FeSe_Eschrig
./5band/ikeda_1111
./5band/graser_1111
./5band/graser_111
./5band/LiFeAs_DFT
./5band/LiFeAs_ARPES
./5band/KFe2Se2_graser
./5band/FeSe_BQPIfittet to BQPI investigation on FeSe, consistent with QO and ARPES
./5band/FeSe_BQPI/2d_kz_NaN2d version of model, hoppings out of plane ignored
./5band/FeSe_BQPI/2d_kz_12d version of model at kz=pi
./5band/FeSe_BQPI/2d_kz_02d version of model at kz=0
./2bandtwo band models: simplest model to capture holelike and electronlike bands in Fe-based SC
./2band/raghuparametrization discussed at early stage
./1bandone band model (square lattice): applicable for cuprates
./1band/ccoc_choubeyDFT derived tight binding model for CCOC, Wannier function also available
./1band/bscco_choubeyDFT derived model for BSCCO, VASP, Wannier function also available
./1band/bscco_bma
./1band/roemersimple t-t' model
./1band/bscco_normantight binding model fitted to ARPES on BSCCO
./1band/bscco_akDFT derived model for BSCCO, Wannier function also available
H_bloch.png

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