triqs.atom_diag.atom_diag.AtomDiagReal.cdag_connection

AtomDiagReal.cdag_connection()

Dispatched C++ function(s).

[1] (op_linear_index: int, sp_index: int)
  -> int

Get the target subspace \(B'\) of the creation operator \(\hat c^\dagger_i\) acting on subspace \(B\).

\[\hat c^\dagger_i\, S_B \subseteq S_{B'} \; ,\]

with \(B' = -1\) if \(\hat c^\dagger_i\) annihilates \(B\). The operator \(\hat c^\dagger_i\) is identified by its linear index \(i\) in the fundamental operator set provided at construction.

Parameters:

op_linear_indexint

Linear index \(i\) of the creation operator.

sp_indexint

Source subspace index \(B\).

Returns:

int

Target subspace index \(B'\), or \(-1\) if the operator annihilates the source subspace.