FatbandsPlot
[1]:
import sisl
info:0: SislInfo: Please install tqdm (pip install tqdm) for better looking progress bars
For this notebook we will create a toy “Boron nitride” tight binding:
[2]:
# First, we create the geometry
BN = sisl.geom.graphene(atoms=["B", "N"])
# Create a hamiltonian with different on-site terms
H = sisl.Hamiltonian(BN)
H[0, 0] = 2
H[1, 1] = -2
H[0, 1] = -2.7
H[1, 0] = -2.7
H[0, 1, (-1, 0)] = -2.7
H[0, 1, (0, -1)] = -2.7
H[1, 0, (1, 0)] = -2.7
H[1, 0, (0, 1)] = -2.7
Note that we could have obtained this hamiltonian from any other source. Then we generate a path for the band structure:
[3]:
band = sisl.BandStructure(
H,
[[0.0, 0.0], [2.0 / 3, 1.0 / 3], [1.0 / 2, 1.0 / 2], [1.0, 1.0]],
301,
[r"Gamma", "K", "M", r"Gamma"],
)
And finally we just ask for the fatbands plot:
[4]:
fatbands = band.plot.fatbands()
fatbands
_ipython_canary_method_should_not_exist_ False
_ipython_display_ True
We only see the bands here, but this is a fatbands plot, and it is ready to accept your requests on what to draw!
Requesting specific weights
The fatbands that the plot draws are controlled by the groups
setting. This setting works exactly like the groups
setting in PdosPlot
, which is documented here. Therefore we won’t give an extended description of it, but just quickly show that you can autogenerate the groups:
[5]:
fatbands.split_orbs(on="species", name="$species")
_ipython_canary_method_should_not_exist_ False
_ipython_display_ True
Or write them yourself if you want the maximum flexibility:
[6]:
fatbands.update_inputs(
groups=[
{"species": "N", "color": "blue", "name": "Nitrogen"},
{"species": "B", "color": "red", "name": "Boron"},
]
)
_ipython_canary_method_should_not_exist_ False
_ipython_display_ True
Scaling fatbands
The visual appeal of fatbands depends a lot on the size of your plot, therefore there’s one global scale
setting that scales all fatbands at the same time:
[7]:
fatbands.update_inputs(fatbands_scale=2).show("png")
Use BandsPlot settings
All settings of BandsPlot
work as well for FatbandsPlot
.