# sisl.physics.WideBandSE

class sisl.physics.WideBandSE(spgeom, eta: float)

Bases: SelfEnergy

Self-energy object with a wide-band electronic structure

Such a self-energy only have imaginary components on the diagonal, with all of them being equal to the eta value.

Parameters:
• spgeom (SparseGeometry or int) – for a SparseGeometry only the length will be queried.

• eta (float) – the imaginary part ($$\eta$$) of the self-energy

Methods

 Calculate the broadening matrix by first calculating the self-energy Calculate the broadening matrix from the self-energy self_energy(*args, **kwargs) Return a dense matrix with the self-energy
__init__(spgeom, eta: float)[source]

Self-energy class for constructing a self-energy.

Parameters:

eta (float)

Calculate the broadening matrix by first calculating the self-energy

Any arguments that is passed to this method is directly passed to self_energy.

See self_energy for details.

This corresponds to:

$\boldsymbol\Gamma = i(\boldsymbol\Sigma - \boldsymbol \Sigma ^\dagger)$

Examples

Calculating both the self-energy and the broadening matrix.

>>> SE = SelfEnergy(...)
>>> self_energy = SE.self_energy(0.1)


For a huge performance boost, please do:

>>> SE = SelfEnergy(...)
>>> self_energy = SE.self_energy(0.1)


Notes

When using both the self-energy and the broadening matrix please use se2broadening after having calculated the self-energy, this will be much, MUCH faster!

se2broadening

converting the self-energy to the broadening matrix

self_energy

the used routine to calculate the self-energy before calculating the broadening matrix

Calculate the broadening matrix from the self-energy

$\boldsymbol\Gamma = i(\boldsymbol\Sigma - \boldsymbol \Sigma ^\dagger)$
Parameters:

SE (matrix) – self-energy matrix

self_energy(*args, **kwargs)[source]

Return a dense matrix with the self-energy

Parameters:

eta (float, optional) – locally override the eta value for the object