From a06be3eb7980e75b0cfdd7ab643f9b7ae5c61243 Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Tue, 2 Apr 2019 07:08:06 +0000
Subject: [PATCH] Update 13_semiconductors.md - typo fix in current expression

---
 src/13_semiconductors.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/13_semiconductors.md b/src/13_semiconductors.md
index 6f8325ed..584989b7 100644
--- a/src/13_semiconductors.md
+++ b/src/13_semiconductors.md
@@ -61,7 +61,7 @@ Heat capacity $C_v = \tfrac{d}{dT}\int_{-\infty}^\infty E\times g(E) \times dE\t
 A completely filled band carries no electric current:
 
 $$
-j = 2e \int_{-\pi/a}^{\pi/a} v(k) dk = 2e \int_{-\pi/a}^{\pi/a} (dE/dk)\times dk = 2e [E(-\pi/a) - E(\pi/a)] = 0
+j = 2e \frac{L}{2\pi} \int_{-\pi/a}^{\pi/a} v(k) dk = 2e \frac{L}{2\pi \hbar} \int_{-\pi/a}^{\pi/a} (dE/dk)\times dk = 2e [E(-\pi/a) - E(\pi/a)] = 0
 $$
 
 ## From electrons to holes
-- 
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