Template Function update_system_operator

• Defined in File sysOperator.hpp

Function Documentation

template<typename nrgcore_type>
void update_system_operator(nrgcore_type *nrg_object, std::vector<qOperator> &systemo_oparator_nQ)

Updates system operators for the next NRG iteration.

This function transforms a given set of operators (e.g., impurity operators) into the basis of the new, larger system created after adding a bath site. This is a crucial step for calculating physical observables in later stages, such as in the backward iteration of the NRG.

The update is performed by constructing the operator representation in the coupled basis of the (system + new bath site) and then rotating it into the new eigenbasis of the combined system’s Hamiltonian.

Template Parameters:

nrgcore_type – The type of the NRG core object, which provides the necessary information about the current NRG state (eigenbases, quantum numbers, etc.).

Parameters:

• nrg_object – Pointer to the NRG core object.

• systemo_oparator_nQ – A vector of qOperator objects to be updated. These operators are defined in the basis of the previous NRG iteration. After the function call, they will be updated to the basis of the current iteration.