From 10fb921270399d58025085e5434157f421242c7a Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Fri, 26 Mar 2021 10:41:09 +0000
Subject: [PATCH] Update 12_band_structures_in_higher_dimensions.md - added
 minus sign in hopping

---
 src/12_band_structures_in_higher_dimensions.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/12_band_structures_in_higher_dimensions.md b/src/12_band_structures_in_higher_dimensions.md
index 5cbffb14..1d5715c6 100644
--- a/src/12_band_structures_in_higher_dimensions.md
+++ b/src/12_band_structures_in_higher_dimensions.md
@@ -215,7 +215,7 @@ Using the [periodic table](../fermi_surfaces) of the Fermi surfaces (or the stat
 ### Exercise 2: Tight-binding in 2D
 
 Consider a rectangular lattice with lattice constants $a_x$ and $a_y$.
-Suppose the hopping parameters in the two directions to be $t_1$ and $t_2$.
+Suppose the hopping parameters in the two corresponding directions to be $-t_1$ and $-t_2$.
 Consider a single orbital per atom and only nearest-neighbour interactions.
 
 1. Write down a 2D tight-binding Schrödinger equation (expand to 2D the results of 1D).
-- 
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