kwant.builder.BuilderLead(builder, interface, padding=None)[source]¶Bases: kwant.builder.Lead
A lead made from a Builder with a spatial symmetry.
builder (Builder) – The tight-binding system of a lead. It has to possess appropriate
symmetry, and it may not contain hoppings between further than
neighboring images of the fundamental domain.
interface (sequence of Site instances) – Sequence of sites in the scattering region to which the lead is
attached.
padding[source]¶A sorted list of sites that originate from the lead, have the same onsite Hamiltonian, and are connected by the same hoppings as the lead sites.
list of Site instances
Notes
The hopping from the scattering region to the lead is assumed to be equal to the hopping from a lead unit cell to the next one in the direction of the symmetry vector (i.e. the lead is ‘leaving’ the system and starts with a hopping).
Every system has an attribute leads, which stores a list of
BuilderLead objects with all the information about the leads that are
attached.
Methods
finalized()[source]¶Return a kwant.builder.InfiniteSystem corresponding to the
compressed lead.
The order of interface sites is kept during finalization.