Update 4_sommerfeld_model.md

src/4_sommerfeld_model.md

@@ -139,7 +139,7 @@ ax.plot(kfilled, Efilled, 'b-', linewidth=4);
 ax.axhline(kf*kf, linestyle="dotted", color='k');
 
 ax.set_xticks([kf]);
-ax.set_yticks([kf*kf]);
+ax.set_yticks([kf*kf + 0.6]);
 ax.set_xticklabels([r"$k_F$"]);
 ax.set_yticklabels([r"$\varepsilon_F$"]);
 
@@ -148,7 +148,7 @@ ax.set_ylabel(r"$\varepsilon$");
 
 ax.set_xlim(-kf*extrapol, kf*extrapol);
 ax.set_ylim(0.0, kf*kf*extrapol);
-draw_classic_axes(ax);
+draw_classic_axes(ax, xlabeloffset=.6);
 ```
 
 The bold line represents all filled states at $T=0$. This is called the _Fermi sea_. Conduction takes place only at the _Fermi surface_: everything below $\varepsilon_{\rm F}-\frac{eV}{2}$ is compensated.