added missing files

sample/07_timeevolution/plot.plt

@@ -0,0 +1,11 @@
+set yr [-0.5:0.5]
+set ytics 0.25
+set key bottom
+set xl "time"
+set yl "magnetization"
+
+plot \
+"magnetization_strong.dat" w lp pt 5 t"hx=2.0", \
+"magnetization_middle.dat" w lp pt 7 t"hx=0.8", \
+"magnetization_weak.dat" w lp pt 9 t"hx=0.5", \
+0.0 lc "black" t""

sample/08_finitetemperature/calcspec.py

@@ -0,0 +1,17 @@
+import numpy as np
+from scipy.interpolate import splrep, splev
+
+
+def spec(name):
+    data = np.loadtxt(f"./energy_{name}.dat")
+    bs = data[:, 0]
+    Es = data[:, 1]
+    spl = splrep(bs, Es)
+    Cs = -bs * bs * splev(bs, spl, der=1)
+    with open(f"./spec_{name}.dat", "w") as f:
+        for b, C in zip(bs, Cs):
+            f.write(f"{b} {C}\n")
+
+
+for name in ("weak", "middle", "strong"):
+    spec(name)