0.0.86

PyPI/README.md

@@ -1 +1 @@
-Guan is an open-source python package developed and maintained by https://www.guanjihuan.com/about. The primary location of this package is on website https://py.guanjihuan.com.
+Guan is an open-source python package developed and maintained by https://www.guanjihuan.com/about. The primary location of this package is on website https://py.guanjihuan.com. With this package, you can calculate band structures, density of states, quantum transport and topological invariant of tight-binding models by invoking the functions you need. Other frequently used functions are also integrated in this package, such as file reading/writing, figure plotting, data processing.

PyPI/setup.cfg

@@ -1,10 +1,10 @@
 [metadata]
 # replace with your username:
 name = guan
-version = 0.0.85
+version = 0.0.86
 author = guanjihuan
 author_email = guanjihuan@163.com
-description = Guan is an open-source python package developed and maintained by https://www.guanjihuan.com/about. The primary location of this package is on website https://py.guanjihuan.com. With this package, you can calculate band structures, density of states, quantum transport and topological invariant of tight-binding models by invoking the functions you need. Other frequently used functions are also integrated in this package, such as file reading/writing, figure plotting, data processing.
+description = An open source python package
 long_description = file: README.md
 long_description_content_type = text/markdown
 url = https://py.guanjihuan.com

PyPI/src/guan/__init__.py

@@ -109,7 +109,9 @@ hamiltonian = guan.hamiltonian_of_finite_size_system_along_two_directions_for_sq
 
 hamiltonian = guan.hamiltonian_of_finite_size_system_along_three_directions_for_cubic_lattice(N1, N2, N3, on_site=0, hopping_1=1, hopping_2=1, hopping_3=1, period_1=0, period_2=0, period_3=0)
 
-hopping = guan.hopping_matrix_along_zigzag_direction_for_graphene_ribbon(N)
+hamiltonian = guan.hamiltonian_of_finite_size_SSH_model(N, v=0.6, w=1, onsite_1=0, onsite_2=0, period=1)
+
+hopping = guan.hopping_matrix_along_zigzag_direction_for_graphene_ribbon(N, eta=0)
 
 hamiltonian = guan.hamiltonian_of_finite_size_system_along_two_directions_for_graphene(N1, N2, period_1=0, period_2=0)
 
@@ -609,9 +611,28 @@ def hamiltonian_of_finite_size_system_along_three_directions_for_cubic_lattice(N
                 hamiltonian[i1*N2*N3*dim+i2*N3*dim+0:i1*N2*N3*dim+i2*N3*dim+dim, i1*N2*N3*dim+i2*N3*dim+(N3-1)*dim+0:i1*N2*N3*dim+i2*N3*dim+(N3-1)*dim+dim] = hopping_3.transpose().conj()
     return hamiltonian
 
-def hopping_matrix_along_zigzag_direction_for_graphene_ribbon(N):
+def hamiltonian_of_finite_size_SSH_model(N, v=0.6, w=1, onsite_1=0, onsite_2=0, period=1):
+    hamiltonian = np.zeros((2*N, 2*N))
+    for i in range(N):
+        hamiltonian[i*2+0, i*2+0] = onsite_1
+        hamiltonian[i*2+1, i*2+1] = onsite_2
+        hamiltonian[i*2+0, i*2+1] = v
+        hamiltonian[i*2+1, i*2+0] = v
+    for i in range(N-1):
+        hamiltonian[i*2+1, (i+1)*2+0] = w
+        hamiltonian[(i+1)*2+0, i*2+1] = w
+    if period==1:
+        hamiltonian[0, 2*N-1] = w
+        hamiltonian[2*N-1, 0] = w
+    return hamiltonian
+
+def hopping_matrix_along_zigzag_direction_for_graphene_ribbon(N, eta=0):
     hopping = np.zeros((4*N, 4*N), dtype=complex)
     for i0 in range(N):
+        hopping[4*i0+0, 4*i0+0] = eta
+        hopping[4*i0+1, 4*i0+1] = eta
+        hopping[4*i0+2, 4*i0+2] = eta
+        hopping[4*i0+3, 4*i0+3] = eta
         hopping[4*i0+1, 4*i0+0] = 1
         hopping[4*i0+2, 4*i0+3] = 1
     return hopping