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Fix XY coupling sign/scale in build_bfg #1

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Merged
Phy-David-Zhang merged 1 commit into from
Jul 13, 2026
Merged

Fix XY coupling sign/scale in build_bfg #1

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6 changes: 5 additions & 1 deletion models/model_bfg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -92,7 +92,11 @@ def build_bfg(
continue

if 'XY' in intr.label:
intr.cpl = -Jperp
# Nicole's U1 Sp/Sm are spherical components:
# Sp = -S+ / sqrt(2), Sm = S- / sqrt(2). The two tensor
# products therefore carry a factor 1/2, so use -2*Jperp
# to implement -Jperp * (S+_i S-_j + S-_i S+_j).
intr.cpl = -2.0 * Jperp
intr.leading_tnsr = xy4.clone()
intr.terminal_tnsr = xy4dag.clone()
if intr.terminal_site > intr.leading_site + 1:
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2 changes: 1 addition & 1 deletion registry.yaml
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Expand Up @@ -7,7 +7,7 @@ categories:
- name: model_bfg
file: models/model_bfg.py
description: Balents-Fisher-Girvin model builder for Alice
sha256: 41e246e3edfb2bc7a0a117a4bd9c1570984acb8fe5eee9d5c882aa13b09e6d24
sha256: 5a3282ae34a5d68171bf60c45d45acc4683ef0fb3e3b46a8599d4ea3e59f9711

intrcmaps:
description: Interaction maps for Alice
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