High temperature series expansions of S = 1/2 Heisenberg spin models: Algorithm to include the magnetic field with optimized complexity
This work presents an algorithm for calculating high temperature series expansions (HTSE) of Heisenberg spin models with spin $S=1/2$ in the thermodynamic limit.This algorithm accounts for the presence of a magnetic field.The paper begins with a comprehensive introduction to HTSE and then focuses on identifying the bottlenecks that limit the comput