def ml(fname,
e,
v,
primitive_dim,
spf_dim,
ph_parameters,
steps=2000,
ode_inter=0.1):
logger = Logger(filename=fname).logger
# define parameters
sys_hamiltonian = np.array([[e, v], [v, -e]], dtype=DTYPE)
projector = np.array([[1.0, 0.0], [0.0, -1.0]],
dtype=DTYPE) # S in H_SB = S x B
primitive_dim = primitive_dim
spf_dim = spf_dim
# Define all Leaf tensors and hamiltonian we need
h_list = []
sys_leaf = Leaf(name='sys0')
h_list.append([(sys_leaf, -1.0j * sys_hamiltonian)])
ph_parameters = ph_parameters
leaves = []
for n, (omega, g) in enumerate(ph_parameters, 1):
ph = Phonon(primitive_dim, omega)
ph_leaf = Leaf(name='ph{}'.format(n))
leaves.append(ph_leaf)
# hamiltonian ph part
h_list.append([(ph_leaf, -1.0j * ph.hamiltonian)])
# e-ph part
op = ph.annihilation_operator + ph.creation_operator
h_list.append([(ph_leaf, g * op), (sys_leaf, -1.0j * projector)])
def ph_spf():
t = Tensor(axis=0, normalized=True)
t.name = str(hex(id(t)))[-4:]
return t
graph, root = huffman_tree(leaves, obj_new=ph_spf, n_branch=2)
try:
graph[root].insert(0, sys_leaf)
except KeyError:
ph_leaf = root
root = Tensor()
graph[root] = [sys_leaf, ph_leaf]
finally:
root.name = 'wfn'
root.axis = None
root.normalized = True
stack = [root]
while stack:
parent = stack.pop()
for child in graph[parent]:
parent.link_to(parent.order, child, 0)
if child in graph:
stack.append(child)
logger.info(f"graph:{graph}")
# Define the detailed parameters for the ML-MCTDH tree
solver = MultiLayer(root, h_list)
bond_dict = {}
# Leaves
for s, i, t, j in root.linkage_visitor():
if t.name and t.name.startswith('sys'):
bond_dict[(s, i, t, j)] = 2
else:
if isinstance(t, Leaf):
bond_dict[(s, i, t, j)] = primitive_dim
else:
bond_dict[(s, i, t, j)] = spf_dim
solver.autocomplete(bond_dict)
logger.info(f"bond_dict:{bond_dict}")
# set initial root array
a, b = 1.0, 0
init_proj = np.array([[a, 0.0], [b, 0.0]]) / np.sqrt(a**2 + b**2)
root_array = Tensor.partial_product(root.array, 0, init_proj, 1)
root.set_array(root_array)
# Define the computation details
solver.ode_method = 'RK45'
solver.snd_order = False
solver.cmf_steps = 100
# Define the obersevable of interest
logger.info('''# time rho00 rho01 rho10 rho11''')
for time, _ in solver.propagator(
steps=steps,
ode_inter=ode_inter,
split=True,
):
t = time
for tensor in root.visitor(axis=None):
tensor.reset()
tensor.normalize(forced=True)
rho = root.partial_env(0, proper=False)
for tensor in root.visitor(axis=None):
tensor.reset()
flat_data = [t] + list(np.reshape(rho, -1))
logger.info('{} {} {} {} {}'.format(*flat_data))
def sbm_ft(including_bath=False, snd=False):
# Define parameters of the model.
sbm = SpinBosonModel(
including_bath=including_bath,
e1=0.,
e2=Quantity(6500, 'cm-1').value_in_au,
v=Quantity(500, 'cm-1').value_in_au,
omega_list=[Quantity(2100, 'cm-1').value_in_au],
lambda_list=([Quantity(750, 'cm-1').value_in_au]),
dim_list=[10],
stop=Quantity(10000, 'cm-1').value_in_au,
n=32,
dim=30,
lambda_g=Quantity(2250, 'cm-1').value_in_au,
omega_g=Quantity(500, 'cm-1').value_in_au,
lambda_d=Quantity(1250, 'cm-1').value_in_au,
omega_d=Quantity(50, 'cm-1').value_in_au,
mu=Quantity(250, 'cm-1').value_in_au,
tau=Quantity(3, 'fs').value_in_au,
t_d=Quantity(6, 'fs').value_in_au,
omega=Quantity(13000, 'cm-1').value_in_au,
)
# Define the topological structure of the ML-MCTDH tree
graph, root = {
'ROOT': ['ELECs', 'I0s'],
'ELECs': ['ELEC', "ELEC'"],
'I0s': ['I0', "I0'"],
}, 'ROOT'
root = Tensor.generate(graph, root)
# Define the detailed parameters for the MC-MCTDH tree
solver = MultiLayer(root, sbm.h_list, f_list=sbm.f_list, use_str_name=True)
bond_dict = {}
# Leaves
for s, i, t, j in root.linkage_visitor():
if isinstance(t, Leaf):
try:
dim = sbm.dimensions[t.name]
except KeyError:
dim = sbm.dimensions[t.name[:-1]]
bond_dict[(s, i, t, j)] = dim
s_ax = s.axis
p, p_ax = s[s_ax]
bond_dict[(p, p_ax, s, s_ax)] = dim**2 if dim < 9 else 50
solver.autocomplete(bond_dict, max_entangled=True)
# Define the computation details
solver.settings(cmf_steps=10,
ode_method='RK45',
ps_method='split-unite',
snd_order=snd)
logging.info("Size of a wfn: {} complexes".format(len(root.vectorize())))
# Do the imaginary time propogation
inv_tem = 1 / 1000
steps = 100
for time, _ in solver.propagator(
steps=steps,
ode_inter=Quantity(inv_tem / steps / 2, unit='K-1').value_in_au,
split=True,
imaginary=True):
t = 2 * Quantity(time).convert_to(unit='K-1').value
z = solver.relative_partition_function
kelvin = 'inf' if abs(t) < 1.e-14 else 1.0 / t
logging.warning('Temperatue: {} K; ln(Z/Z_0): {}'.format(
kelvin, np.log(z)))
# Define the obersevable of interest
projector = np.array([[0., 0.], [0., 1.]])
op = [[[root[0][0][1][0], projector]]]
# Do the real time propogation
tp_list = []
steps = 100
root.is_normalized = True
for time, _ in solver.propagator(steps=steps,
ode_inter=Quantity(10 / steps,
'fs').value_in_au,
split=True,
imaginary=False):
t = Quantity(time).convert_to(unit='fs').value
p = solver.expection(op=op)
logging.warning('Time: {:.2f} fs; P2: {}'.format(t, p))
tp_list.append((t, p))
return np.array(tp_list)
def sbm_zt(including_bath=False, split=False, snd=False):
omega = 13000
sbm = SpinBosonModel(
including_bath=including_bath,
e1=0.,
e2=Quantity(6500, 'cm-1').value_in_au,
v=Quantity(500, 'cm-1').value_in_au,
omega_list=[
Quantity(2100, 'cm-1').value_in_au,
Quantity(650, 'cm-1').value_in_au,
Quantity(400, 'cm-1').value_in_au,
Quantity(150, 'cm-1').value_in_au
],
lambda_list=([Quantity(750, 'cm-1').value_in_au] * 4),
dim_list=[10, 14, 20, 30],
stop=Quantity(3 * 2250, 'cm-1').value_in_au,
n=32,
dim=30,
lambda_g=Quantity(2250, 'cm-1').value_in_au,
omega_g=Quantity(500, 'cm-1').value_in_au,
lambda_d=Quantity(1250, 'cm-1').value_in_au,
omega_d=Quantity(50, 'cm-1').value_in_au,
mu=Quantity(250, 'cm-1').value_in_au,
tau=Quantity(30, 'fs').value_in_au,
t_d=Quantity(60, 'fs').value_in_au,
omega=Quantity(omega, 'cm-1').value_in_au,
)
# Define the topological structure of the ML-MCTDH tree
graph, root = sbm.autograph(n_branch=2)
root = Tensor.generate(graph, root)
# Define the detailed parameters for the MC-MCTDH tree
solver = MultiLayer(root, sbm.h_list, f_list=sbm.f_list, use_str_name=True)
bond_dict = {}
# Leaves
for s, i, t, j in root.linkage_visitor():
if isinstance(t, Leaf):
bond_dict[(s, i, t, j)] = sbm.dimensions[t.name]
# ELEC part
elec_r = root[0][0]
for s, i, t, j in elec_r.linkage_visitor(leaf=False):
raise NotImplementedError()
# INNER part
inner_r = root[1][0] if including_bath else root
if including_bath:
bond_dict[(root, 1, inner_r, 0)] = 60
for s, i, t, j in inner_r.linkage_visitor(leaf=False):
bond_dict[(s, i, t, j)] = 50
# OUTER part
if including_bath:
outer_r = root[2][0]
bond_dict[(root, 2, outer_r, 0)] = 20
for s, i, t, j in root[2][0].linkage_visitor(leaf=False):
bond_dict[(s, i, t, j)] = 10
solver.autocomplete(bond_dict, max_entangled=False)
# Define the computation details
solver.settings(
max_ode_steps=100,
cmf_steps=(1 if split else 10),
ode_method='RK45',
ps_method='s',
snd_order=snd,
)
print("Size of a wfn: {} complexes".format(len(root.vectorize())))
root.is_normalized = True
# Define the obersevable of interest
projector = np.array([[0., 0.], [0., 1.]])
op = [[[root[0][0], projector]]]
t_p = []
for time, _ in solver.propagator(
steps=20,
ode_inter=Quantity(0.2, 'fs').value_in_au,
split=split,
move_energy=True,
):
t, p = (Quantity(time).convert_to(unit='fs').value,
solver.expection(op=op))
t_p.append((t, p))
logging.warning('Time: {:.2f} fs, P2: {}'.format(t, p))
if np.abs(p) > 0.5:
break
return np.array(t_p)
def sbm_zt(including_bath=False, split=False, snd=False):
sbm_para_dict = {
'including_bath':
including_bath,
'e1':
0.,
'e2':
Quantity(6500, 'cm-1').value_in_au,
'v':
Quantity(500, 'cm-1').value_in_au,
"omega_list": [
Quantity(2100, 'cm-1').value_in_au,
Quantity(650, 'cm-1').value_in_au,
Quantity(400, 'cm-1').value_in_au,
Quantity(150, 'cm-1').value_in_au
],
'lambda_list': ([Quantity(750, 'cm-1').value_in_au] * 4),
'dim_list': [10, 14, 20, 30],
'stop':
Quantity(3 * 2250, 'cm-1').value_in_au,
'n':
32,
'dim':
30,
'lambda_g':
Quantity(2250, 'cm-1').value_in_au,
'omega_g':
Quantity(500, 'cm-1').value_in_au,
'lambda_d':
Quantity(1250, 'cm-1').value_in_au,
'omega_d':
Quantity(50, 'cm-1').value_in_au,
'mu':
Quantity(250, 'cm-1').value_in_au,
'tau':
Quantity(30, 'fs').value_in_au,
't_d':
Quantity(60, 'fs').value_in_au,
'omega':
Quantity(13000, 'cm-1').value_in_au,
}
sbm = SpinBosonModel(**sbm_para_dict)
# Define the topological structure of the ML-MCTDH tree
graph, root = sbm.autograph(n_branch=2)
root = Tensor.generate(graph, root)
# Define the detailed parameters for the MC-MCTDH tree
solver = MultiLayer(root, sbm.h_list, f_list=sbm.f_list, use_str_name=True)
bond_dict = {}
# Leaves
for s, i, t, j in root.linkage_visitor():
if isinstance(t, Leaf):
bond_dict[(s, i, t, j)] = sbm.dimensions[t.name]
# ELEC part
elec_r = root[0][0]
for s, i, t, j in elec_r.linkage_visitor(leaf=False):
raise NotImplementedError()
# INNER part
inner_r = root[1][0] if including_bath else root
if including_bath:
bond_dict[(root, 1, inner_r, 0)] = 60
for s, i, t, j in inner_r.linkage_visitor(leaf=False):
bond_dict[(s, i, t, j)] = 50
# OUTER part
if including_bath:
outer_r = root[2][0]
bond_dict[(root, 2, outer_r, 0)] = 20
for s, i, t, j in root[2][0].linkage_visitor(leaf=False):
bond_dict[(s, i, t, j)] = 10
solver.autocomplete(bond_dict, max_entangled=False)
# Define the computation details
solver.settings(
max_ode_steps=100,
cmf_steps=(1 if split else 10),
ode_method='RK45',
ps_method='s',
snd_order=snd,
)
root.is_normalized = True
# Define the obersevable of interest
projector = np.array([[0., 0.], [0., 1.]])
op = [[[root[0][0], projector]]]
t_p = []
for time, _ in solver.propagator(
steps=20,
ode_inter=Quantity(0.2, 'fs').value_in_au,
split=split,
move_energy=True,
):
t, p = (Quantity(time).convert_to(unit='fs').value,
solver.expection(op=op))
t_p.append((t, p))
logging.warning('Time: {:.2f} fs, P2: {}'.format(t, p))
if np.abs(p) > 0.5:
break
# Save the results
msg = 'split' if split else 'origin'
msg2 = 'snd' if snd else 'fst'
np.savetxt('sbm-zt-{}-{}.dat'.format(msg, msg2), t_p)
def ml(dof, e, v, eta, cutoff, scale=5, loc=None, steps=2000, ode_inter=0.1):
f_ = 'dof{}-eta{}.log'.format(dof, eta)
logger = Logger(filename=f_).logger
# define parameters
e = Quantity(e, 'cm-1').value_in_au
v = Quantity(v, 'cm-1').value_in_au
eta = Quantity(eta, 'cm-1').value_in_au
omega0 = Quantity(cutoff, 'cm-1').value_in_au
sys_hamiltonian = np.array([[-e / 2.0, v], [v, e / 2.0]], dtype=DTYPE)
projector = np.array([[0.0, 0.0], [0.0, 1.0]],
dtype=DTYPE) # S in H_SB = S x B
primitive_dim = 100
spf_dim = 20
# Spectrum function
def spec_func(omega):
if 0 < omega < omega0:
return eta
else:
return 0.0
# Define all Leaf tensors and hamiltonian we need
h_list = []
sys_leaf = Leaf(name='sys0')
h_list.append([(sys_leaf, -1.0j * sys_hamiltonian)])
ph_parameters = linear_discretization(spec_func, omega0, dof)
if loc is not None:
adj_pair = (ph_parameters[loc][0], ph_parameters[loc][1] * scale)
ph_parameters[loc] = adj_pair
leaves = []
for n, (omega, g) in enumerate(ph_parameters, 1):
ph = Phonon(primitive_dim, omega)
ph_leaf = Leaf(name='ph{}'.format(n))
leaves.append(ph_leaf)
# hamiltonian ph part
h_list.append([(ph_leaf, -1.0j * ph.hamiltonian)])
# e-ph part
op = ph.annihilation_operator + ph.creation_operator
h_list.append([(ph_leaf, g * op), (sys_leaf, -1.0j * projector)])
def ph_spf(n=0):
n += 1
return Tensor(name='spf{}'.format(n), axis=0)
graph, root = huffman_tree(leaves, obj_new=ph_spf, n_branch=2)
try:
graph[root].insert(0, sys_leaf)
except KeyError:
ph_leaf = root
root = Tensor()
graph[root] = [sys_leaf, ph_leaf]
finally:
root.name = 'wfn'
root.axis = None
print(graph)
stack = [root]
while stack:
parent = stack.pop()
for child in graph[parent]:
parent.link_to(parent.order, child, 0)
if child in graph:
stack.append(child)
# Define the detailed parameters for the ML-MCTDH tree
solver = MultiLayer(root, h_list)
bond_dict = {}
# Leaves
for s, i, t, j in root.linkage_visitor():
if t.name.startswith('sys'):
bond_dict[(s, i, t, j)] = 2
else:
if isinstance(t, Leaf):
bond_dict[(s, i, t, j)] = primitive_dim
else:
bond_dict[(s, i, t, j)] = spf_dim
solver.autocomplete(bond_dict)
# set initial root array
a, b = 1.0, 1.0
init_proj = np.array([[a, 0.0], [b, 0.0]]) / np.sqrt(a**2 + b**2)
root_array = Tensor.partial_product(root.array, 0, init_proj, 1)
root.set_array(root_array)
# Define the computation details
solver.ode_method = 'RK45'
solver.snd_order = True
solver.cmf_steps = 1
root.is_normalized = True
# Define the obersevable of interest
logger.info('''# time/fs rho00 rho01 rho10 rho11''')
for time, _ in solver.propagator(
steps=steps,
ode_inter=Quantity(ode_inter, 'fs').value_in_au,
split=True,
):
t = Quantity(time).convert_to(unit='fs').value
for tensor in root.visitor(axis=None):
tensor.reset()
rho = root.partial_env(0, proper=False)
for tensor in root.visitor(axis=None):
tensor.reset()
flat_data = [t] + list(np.reshape(rho, -1))
logger.info('{} {} {} {} {}'.format(*flat_data))