The Algorithms for Lattice Fermions package provides a general code for the finite-temperature auxiliary-field quantum Monte Carlo models.

Features

General Hamiltonian

ALF simulates any model that can be written in terms of sums of:

• single-body operators,
  
• squares of single-body operators, and
  
• single-body operators coupled to an Ising field with given dynamics.

Flexibility

Choosing from predefined types or defining their own, the user can specify:

• the model,
  
• the Bravais lattice, and
  
• observables (equal-time and time-displaced).

High Performance

ALF makes full use of the computational resources available, boasting:

• parallelization via MPI and OpenMP,
  
• near-optimal single-core performance, and
  
• restart facilities.

Support

Users can count with:

• an introductory tutorial,
  
• extensive documentation, and
  
• Contacting us at any time.

Advanced Features

Among other facilities, ALF provides:

• parallel tempering,
  
• ground state projective QMC, and
  
• global Monte Carlo updates.

ALF’s code is available from our Git instance at https://alf.physik.uni-wuerzburg.de where one can also sign in to file issues.