kwant.solvers.common.SMatrix(data, lead_info, out_leads, in_leads)¶Bases: kwant.solvers.common.BlockResult
A scattering matrix.
Transport properties can be easily accessed using the
transmission method (don’t be fooled by the name,
it can also compute reflection, which is just transmission from one
lead back into the same lead.)
SMatrix however also allows for a more direct access to the result: The
data stored in SMatrix is a scattering matrix with respect to lead modes
and these modes themselves. The details of this data can be directly
accessed through the instance variables data and lead_info. Subblocks
of data corresponding to particular leads are conveniently obtained by
submatrix.
Attributes
| data | (NumPy array) a matrix containing all the requested matrix elements of the scattering matrix. |
| lead_info | (list of data) a list containing kwant.physics.PropagatingModes for each lead. |
| out_leads, in_leads | (list of integers) indices of the leads where current is extracted (out) or injected (in). Only those are listed for which SMatrix contains the calculated result. |
Methods
block_coords(lead_out, lead_in)¶Return slices corresponding to the block from lead_in to lead_out.
in_block_coords(lead_in)¶Return a slice with the columns in the block corresponding to lead_in.
out_block_coords(lead_out)¶Return a slice with the rows in the block corresponding to lead_out.
submatrix(lead_out, lead_in)¶Return the matrix elements from lead_in to lead_out.
transmission(lead_out, lead_in)¶Return transmission from lead_in to lead_out.