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kwant
kwant
Commits
c494477a
Commit
c494477a
authored
Nov 06, 2018
by
Tómas
Committed by
Anton Akhmerov
Nov 26, 2018
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allow computations even if a discrete symmetry is broken
parent
f10f3de2
Changes
1
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1 changed file
with
21 additions
and
6 deletions
+21
-6
system.py
kwant/system.py
+21
-6
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kwant/system.py
View file @
c494477a
...
...
@@ -11,6 +11,7 @@
__all__
=
[
'System'
,
'FiniteSystem'
,
'InfiniteSystem'
]
import
abc
import
warnings
from
copy
import
copy
from
.
import
_system
...
...
@@ -235,12 +236,26 @@ class InfiniteSystem(System, metaclass=abc.ABCMeta):
ham
=
self
.
cell_hamiltonian
(
args
,
params
=
params
)
hop
=
self
.
inter_cell_hopping
(
args
,
params
=
params
)
symmetries
=
self
.
discrete_symmetry
(
args
,
params
=
params
)
broken
=
symmetries
.
validate
(
ham
)
if
broken
is
not
None
:
raise
ValueError
(
"Cell Hamiltonian breaks "
+
broken
.
lower
())
broken
=
symmetries
.
validate
(
hop
)
if
broken
is
not
None
:
raise
ValueError
(
"Inter-cell hopping breaks "
+
broken
.
lower
())
# Check whether each symmetry is broken.
# If a symmetry is broken, it is ignored in the computation.
symmetry_names
=
[
'Conservation law'
]
+
physics
.
symmetry
.
_names
broken
=
(
symmetries
.
validate
(
ham
),
symmetries
.
validate
(
hop
))
for
name
in
symmetry_names
:
if
name
in
broken
:
warnings
.
warn
(
"Hamiltonian breaks "
+
name
+
", ignoring the symmetry in the computation."
)
if
name
==
symmetry_names
[
0
]:
symmetries
.
projectors
=
None
elif
name
==
symmetry_names
[
1
]:
symmetries
.
time_reversal
=
None
elif
name
==
symmetry_names
[
2
]:
symmetries
.
particle_hole
=
None
elif
name
==
symmetry_names
[
3
]:
symmetries
.
chiral
=
None
else
:
warnings
.
warn
(
"Misidentified a broken symmetry"
+
" in the lead."
)
shape
=
ham
.
shape
assert
len
(
shape
)
==
2
assert
shape
[
0
]
==
shape
[
1
]
...
...
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