order_combine_term¶
full name: tenpy.networks.terms.order_combine_term
parent module:
tenpy.networks.termstype: function
-
tenpy.networks.terms.order_combine_term(term, sites)[source]¶ Combine operators in a term to one terms per site.
Takes in a term of operators and sites they acts on, commutes operators to order them by site and combines operators acting on the same site with
multiply_op_names().- Parameters
- terma list of (opname_i, i) tuples
Represents a product of onsite operators with site indices i they act on. Needs not to be ordered and can have multiple entries acting on the same site.
- siteslist of
Site Defines the local Hilbert space for each site. Used to check whether the operators anticommute (= whether they need Jordan-Wigner strings) and for multiplication rules.
- Returns
- combined_term :
Equivalent to term but with at most one operator per site.
- overall_sign+1 | -1 | 0
Comes from the (anti-)commutation relations. When the operators in term are multiplied from left to right, and then multiplied by overall_sign, the result is the same operator as the product of combined_term from left to right.