From e5bf213f066eddbb2d4e5c82916ed3280403b3f8 Mon Sep 17 00:00:00 2001
From: Joseph Weston <joseph.weston08@gmail.com>
Date: Fri, 1 Dec 2017 11:56:20 +0100
Subject: [PATCH] correct sign and factor 2 in spin_potential_shape tutorial
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For a spin-orbit term of the form '-iασ_y∂_x' the hopping
for 'HoppingKind((1, 0), lat)' (*from* 'x' *to* 'x + a')
is 'iασ_y/2'.
Closes #175.
---
doc/source/code/figure/spin_orbit.py.diff | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/doc/source/code/figure/spin_orbit.py.diff b/doc/source/code/figure/spin_orbit.py.diff
index ba32e812..649d8c4f 100644
--- a/doc/source/code/figure/spin_orbit.py.diff
+++ b/doc/source/code/figure/spin_orbit.py.diff
@@ -47,10 +47,10 @@
4 * t * sigma_0 + e_z * sigma_z
# hoppings in x-direction
syst[kwant.builder.HoppingKind((1, 0), lat, lat)] = \
- -t * sigma_0 - 1j * alpha * sigma_y
+ -t * sigma_0 + 1j * alpha * sigma_y / 2
# hoppings in y-directions
syst[kwant.builder.HoppingKind((0, 1), lat, lat)] = \
- -t * sigma_0 + 1j * alpha * sigma_x
+ -t * sigma_0 - 1j * alpha * sigma_x / 2
#HIDDEN_END_uxrm
#### Define the left lead. ####
@@ -60,10 +60,10 @@
lead[(lat(0, j) for j in range(W))] = 4 * t * sigma_0 + e_z * sigma_z
# hoppings in x-direction
lead[kwant.builder.HoppingKind((1, 0), lat, lat)] = \
- -t * sigma_0 - 1j * alpha * sigma_y
+ -t * sigma_0 + 1j * alpha * sigma_y / 2
# hoppings in y-directions
lead[kwant.builder.HoppingKind((0, 1), lat, lat)] = \
- -t * sigma_0 + 1j * alpha * sigma_x
+ -t * sigma_0 - 1j * alpha * sigma_x / 2
#HIDDEN_END_yliu
#### Attach the leads and return the finalized system. ####
--
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