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Fix correlator for fermionic PEPS #232

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Merged
Yue-Zhengyuan merged 3 commits into from
Jul 8, 2025
Merged

Fix correlator for fermionic PEPS #232

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b52e274
Fix correlator for fermionic PEPS
Yue-Zhengyuan Jul 7, 2025
d59b405
Fix formatting
Yue-Zhengyuan Jul 7, 2025
795ee6e
Improve test coverage
Yue-Zhengyuan Jul 7, 2025
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2 changes: 2 additions & 0 deletions src/algorithms/correlators.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ function correlator_horizontal(
)
T = TransferMatrix(Atop, sandwich, _dag(Abot))
Vo = Vo * T
twistdual!(T.below, 2:numout(T.below))
Vn = Vn * T
i += CartesianIndex(0, 1)
end
Expand All @@ -53,6 +54,7 @@ function correlator_horizontal(
)
T = TransferMatrix(Atop, sandwich, _dag(Abot))
Vo = Vo * T
twistdual!(T.below, 2:numout(T.below))
Vn = Vn * T
i += CartesianIndex(0, 1)

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3 changes: 3 additions & 0 deletions test/runtests.jl
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Expand Up @@ -84,6 +84,9 @@ end
@time @safetestset "Rotation of InfiniteWeightPEPS" begin
include("utility/iwpeps_rotation.jl")
end
@time @safetestset "Correlators" begin
include("utility/correlator.jl")
end
end
if GROUP == "ALL" || GROUP == "EXAMPLES"
@time @safetestset "Transverse Field Ising model" begin
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26 changes: 26 additions & 0 deletions test/utility/correlator.jl
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
using Test
using Random
using TensorKit
using PEPSKit
import MPSKitModels: TJOperators as tJ

Pspace = tJ.tj_space(Trivial, Trivial)
Vspace = Vect[FermionParity](0 => 2, 1 => 2)
Espace = Vect[FermionParity](0 => 3, 1 => 3)
Random.seed!(100)
peps = InfinitePEPS(rand, ComplexF64, Pspace, Vspace; unitcell=(2, 2));
env = CTMRGEnv(rand, ComplexF64, peps, Espace);
lattice = collect(space(t, 1) for t in peps.A)

site0 = CartesianIndex(1, 1)
maxsep = 8
site1s = collect(site0 + CartesianIndex(0, i) for i in 2:2:maxsep)

op = tJ.S_exchange(ComplexF64, Trivial, Trivial);

vals1 = correlator(peps, op, site0, site1s, env)
vals2 = collect(begin
O = LocalOperator(lattice, (site0, site1) => op)
val = expectation_value(peps, O, env)
end for site1 in site1s)
@test vals1 ≈ vals2
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