Documentation

Tutorials

• Square lattice susceptibility and the Random Phase Approximation (RPA)
• Bethe-Salpeter Equation (BSE) on the Hubbard atom
• Lattice Bethe-Salpeter Equation (BSE)
• DMFT lattice susceptibility
• Spin susceptibility in Sr2RuO4
• Susceptibility of the Hubbard-Zeeman model
• Linearized Eliashberg equation on the attractive Hubbard model
• Solving the linearized Eliashberg equation in the random phase approximation limit
• The Two-Particle Self Consistent method (TPSC)

Python reference manual

• Lattice Green’s functions
  • lattice_dyson_g0_wk()
  • lattice_dyson_g0_fk()
  • lattice_dyson_g_wk()
  • lattice_dyson_g_fk()
  • lattice_dyson_g_f()
  • lattice_dyson_g_w()
• Non-interacting generalized susceptibility
  • imtime_bubble_chi0_wk()
  • lindhard_chi00()
• Random Phase Approximation
  • solve_rpa_PH()
  • kanamori_quartic_tensor()
• Impurity susceptibility and Bethe-Salpeter Equation
  • chi0_from_gg2_PH()
  • chi0_from_gg2_PP()
  • chi_from_gg2_PH()
  • chi_from_gg2_PP()
  • solve_local_bse()
• Lattice Bethe-Salpeter Equation
  • solve_lattice_bse()
  • solve_lattice_bse_at_specific_w()
  • get_chi0_wnk()
  • get_chi0_nk_at_specific_w()
• Dual Bethe-Salpeter Equation
  • solve_lattice_dbse()
  • impurity_reducible_vertex_F()
• GW approximation
  • GWSolver
  • dynamical_screened_interaction_W()
  • dynamical_screened_interaction_W_from_generalized_susceptibility()
  • bubble_PI_wk()
  • gw_sigma()
  • g0w_sigma()
• Two-particle self-consistent solver (TPSC)
  • tpsc_solver
• Linearized Eliashberg equation
  • solve_eliashberg()
  • preprocess_gamma_for_fft()
  • semi_random_initial_delta()
  • power_method_LR()
  • implicitly_restarted_arnoldi_method()
  • construct_gamma_singlet_rpa()
  • construct_gamma_triplet_rpa()
• Hubbard atom analytic response functions
  • analytic_hubbard_atom()
• Two-particle response function linear-algebra operations
  • inverse_PH()
  • inverse_PP()
  • inverse_PH_bar()
  • product_PH()
  • product_PP()
  • product_PH_bar()
  • identity_PH()
  • identity_PP()
  • identity_PH_bar()
• Wannier90 tight binding parsers
  • parse_hopping_from_wannier90_hr_dat()
  • parse_lattice_vectors_from_wannier90_wout()
  • parse_reciprocal_lattice_vectors_from_wannier90_wout()
  • parse_band_structure_from_wannier90_band_dat()
• Tight binding lattice model
  • TBLattice
  • create_square_lattice()
  • TBSuperLattice
• Hartree-Fock and Hartree solvers
  • HartreeFockSolver
  • HartreeFockResponse
  • HartreeSolver
  • HartreeResponse
• Utility functions
  • k_space_path()
  • chi_contraction()
• Parameter collections
  • ParameterCollection
  • ParameterCollections
  • parameter_scan()

C++ reference manual

The C++ reference manual can be found here.

Theory and notation

• Response function notation
  • Generalized susceptibility \(\chi\)
    • Bare generalized susceptibility \(\chi_0\)
    • Reducible vertex function \(F\)
    • Full generalized particle-hole susceptibility \(\chi\)
  • Bethe-Salpeter equations (BSE)
    • Matsubara frequency transforms
    • Particle-hole channel (\(PH\))
    • Crossed-Particle-particle channel (\(PPx\))
• On the single particle Green’s function
  • Field operator Matsubara transforms
• Vertex functions
  • Fully reducible vertex \(F\)
  • Bethe-Salpeter equations for the fully reducible vertex \(F\)
  • Matsubara frequency parametrization
  • Derivation: Product relations
    • Particle-Hole channel (\(PH\))
    • Vertical-Particle-Hole channel (\(\bar{PH}\))
    • Particle-Particle channel (\(PP\))
    • Crossed-Particle-Particle channel (\(PPx\))
• (Anti-)Periodicity
  • Two-particle Green’s functions
• Kubo-Martin-Schwinger (KMS) boundary conditions
  • Generalization to two-particle Green’s functions
• Linear response
  • From the generalized susceptibility
  • From an applied external field
• Random phase approximation (RPA)
  • Interaction
  • Antisymmetrized interaction tensor \(U\)
  • Spin-independent RPA calculations
    • Matrix RPA
    • Mapping between spin-dependent and independent quantities
    • Example
• Linearized Eliashberg Equation
  • Deriving the linearized Eliashberg equation from the normal state
    • Relation to the BCS gap equation
  • Details for applications
    • SPOT Condition
    • Random phase approximation for the irreducible particle-particle vertex

FAQs

• Frequently-asked questions
  • Q: Why is not feature X implemented?