From 091e473d1b231936aeeb00af75c56a9af83604f1 Mon Sep 17 00:00:00 2001
From: Giuseppe Carleo <28149892+gcarleo@users.noreply.github.com>
Date: Sat, 10 Apr 2021 12:30:24 +0200
Subject: [PATCH] Invert ordering of spin states to match standard S_z operator
---
netket/hilbert/spin.py | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/netket/hilbert/spin.py b/netket/hilbert/spin.py
index d8ac9054a..9307a7f8d 100644
--- a/netket/hilbert/spin.py
+++ b/netket/hilbert/spin.py
@@ -57,7 +57,11 @@ class Spin(CustomHilbert):
total_sz: Optional[float] = None,
graph: Optional[AbstractGraph] = None,
):
- r"""Hilbert space obtained as tensor product of local spin states.
+ r"""Hilbert space obtained as tensor product of local eigenstates of the spin operator S_z.
+ For spin 1/2 particles the local quantum numbers correspond to the eigensvalues of the Pauli matrix
+ sigma_z: (1,-1).
+ In general, for integer spin s, they correspond to the integer eigenvalues (s,s-1,..,0,..,-s+1,-s).
+ For semi-integer s, they correspond to the integer eigenvalues (2s,2s-2,..,-2s+2,-2s)
Args:
s: Spin at each site. Must be integer or half-integer.
@@ -83,7 +87,7 @@ class Spin(CustomHilbert):
for i in range(local_size):
local_states[i] = -round(2 * s) + 2 * i
- local_states = local_states.tolist()
+ local_states = sorted(local_states.tolist(), reverse=True)
_check_total_sz(total_sz, N)
if total_sz is not None:
--
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