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Fix 2d heisenberg example and add error for bad unit cell inputs #88

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merged 4 commits into from
Oct 14, 2024
Merged

Fix 2d heisenberg example and add error for bad unit cell inputs #88

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bdb140a
Fix 2d heisenberg and add warning
ryanlevy Oct 11, 2024
f75c6e8
Cleanup
ryanlevy Oct 11, 2024
1a08e32
Add yperiodic option
ryanlevy Oct 14, 2024
bbb6106
Negative sign fix
ryanlevy Oct 14, 2024
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6 changes: 3 additions & 3 deletions examples/vumps/vumps_2d_heisenberg.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -34,9 +34,9 @@ function ITensorInfiniteMPS.unit_cell_terms(::Model"heisenberg2D"; width)
opsum = OpSum()
for i in 1:width
# Vertical
opsum += -0.5, "S+", i, "S-", mod(i + 1, width)
opsum += -0.5, "S-", i, "S+", mod(i + 1, width)
opsum += "Sz", i, "Sz", mod(i + 1, width)
opsum += -0.5, "S+", i, "S-", mod(i, width) + 1
opsum += -0.5, "S-", i, "S+", mod(i, width) + 1
opsum += "Sz", i, "Sz", mod(i, width) + 1
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# Horizontal
opsum += -0.5, "S+", i, "S-", i + width
opsum += -0.5, "S-", i, "S+", i + width
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6 changes: 6 additions & 0 deletions src/models/models.jl
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Expand Up @@ -245,6 +245,12 @@ function infinite_terms(opsum::OpSum; kwargs...)
# stores all terms starting on site `i`.
opsum_cell_dict = groupreduce(minimum ∘ ITensors.sites, +, opsum)
nsites = maximum(keys(opsum_cell_dict))
# check that we don't have terms we will ignore
dropped = filter(x -> x <= 0, keys(opsum_cell_dict))
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if length(dropped) > 0
@warn "The input unit cell terms include terms that are being ignored on sites: $([d for d in dropped])"
end

# Assumes each site in the unit cell has a term
for j in 1:nsites
if !haskey(opsum_cell_dict, j)
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