From eac550aff8703636ca69fc98b7b5e8d02c4ae8f5 Mon Sep 17 00:00:00 2001
From: Anton Akhmerov <anton.akhmerov@gmail.com>
Date: Fri, 5 Mar 2021 09:08:30 +0000
Subject: [PATCH] only plot DOS at positive frequencies

---
 src/7_tight_binding_model_solutions.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/7_tight_binding_model_solutions.md b/src/7_tight_binding_model_solutions.md
index 17e636b8..ee2b5622 100644
--- a/src/7_tight_binding_model_solutions.md
+++ b/src/7_tight_binding_model_solutions.md
@@ -81,11 +81,11 @@ pyplot.yticks([-np.sqrt(2), 0, np.sqrt(2)], [r'$-2\sqrt{\frac{\kappa}{m}}$', 0,
 pyplot.tight_layout();
 
 pyplot.subplot(1,2,2)
-w = np.linspace(-0.95, 0.95, 300);
+w = np.linspace(0, 0.95, 300);
 g = 1/np.sqrt(1-w**2);
 pyplot.plot(w, g, 'b');
 pyplot.xlabel(r'$\omega$'); pyplot.ylabel('$g(w)$');
-pyplot.xticks([-1, 0, 1], [r'$-2\sqrt{\frac{k}{m}}$', 0, r'$2\sqrt{\frac{k}{m}}$']);
+pyplot.xticks([0, 1], [0, r'$2\sqrt{\frac{k}{m}}$']);
 pyplot.yticks([0.5, 1], [0, r'$\frac{L}{2\pi a}\sqrt{\frac{\kappa}{m}}$']);
 pyplot.tight_layout();
 ```
-- 
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