Solutions lecture 7

src/8_many_atoms_sol.md

@@ -62,7 +62,7 @@ t2 = 1.1;
 pyplot.plot(k, np.sqrt(t1**2 + t2**2+2*t1*t2*np.cos(k)),'b',label='2 atom dispersion')
 pyplot.plot(k, -np.sqrt(t1**2 + t2**2+2*t1*t2*np.cos(k)),'b')
 pyplot.plot(k, -(t1+t2)*np.cos(k/2),'r',label='1 atom dispersion')
-pyplot.plot(k[199:100:-1],-(t1+t2)*np.cos(k[0:99]/2),'r--')
+pyplot.plot(k[199:100:-1],-(t1+t2)*np.cos(k[0:99]/2),'r--','1 atom dispersion with folded Brillouin zone')
 
 pyplot.xlabel('$ka$'); pyplot.ylabel(r'$E-\epsilon$')
 pyplot.xticks([-2*pi, -pi, 0, pi,2*pi], [r'$-2ka$',r'$-ka$', 0, r'$ka$',r'$2ka$'])