From 9ede6faaf69c50954ca5c4bec788ff59b7c5ff5b Mon Sep 17 00:00:00 2001
From: Christoph Groth <christoph.groth@cea.fr>
Date: Mon, 17 Feb 2020 17:13:07 +0100
Subject: [PATCH] refill code in system.py
---
kwant/system.py | 31 ++++++++++++++++++-------------
1 file changed, 18 insertions(+), 13 deletions(-)
diff --git a/kwant/system.py b/kwant/system.py
index c33a15d1..594f09be 100644
--- a/kwant/system.py
+++ b/kwant/system.py
@@ -1,4 +1,4 @@
-# Copyright 2011-2019 Kwant authors.
+# Copyright 2011-2020 Kwant authors.
#
# This file is part of Kwant. It is subject to the license terms in the file
# LICENSE.rst found in the top-level directory of this distribution and at
@@ -479,8 +479,9 @@ class System(metaclass=abc.ABCMeta):
The sites of the system are indexed by integers ranging from 0 to
``self.graph.num_nodes - 1``.
- Optionally, a class derived from ``System`` can provide a method ``pos`` which
- is assumed to return the real-space position of a site given its index.
+ Optionally, a class derived from ``System`` can provide a method
+ ``pos`` which is assumed to return the real-space position of a site
+ given its index.
Due to the ordering semantics of sequences, and the fact that a given
``first_site`` can only appear *at most once* in ``site_ranges``,
@@ -566,7 +567,8 @@ class VectorizedSystem(System, metaclass=abc.ABCMeta):
indexed by 'idx1' and 'idx2'.
terms : sequence of tuples
Each tuple has the following structure:
- (subgraph: int, symmetry_element: tuple, hermitian: bool, parameters: List(str))
+ (subgraph: int, symmetry_element: tuple, hermitian: bool,
+ parameters: List(str))
'subgraph' indexes 'subgraphs' and supplies the to/from sites of this
term. 'symmetry_element' is the symmetry group element that should be
applied to the 'to-sites' of this term.
@@ -582,8 +584,9 @@ class VectorizedSystem(System, metaclass=abc.ABCMeta):
The sites of the system are indexed by integers ranging from 0 to
``self.graph.num_nodes - 1``.
- Optionally, a class derived from ``System`` can provide a method ``pos`` which
- is assumed to return the real-space position of a site given its index.
+ Optionally, a class derived from ``System`` can provide a method
+ ``pos`` which is assumed to return the real-space position of a site
+ given its index.
"""
@abc.abstractmethod
def hamiltonian_term(self, index, selector=slice(None),
@@ -657,15 +660,15 @@ class FiniteSystemMixin(metaclass=abc.ABCMeta):
The length of ``leads`` must be equal to the length of ``lead_interfaces``
and ``lead_paddings``.
- For lead ``n``, the method leads[n].selfenergy must return a square matrix
- whose size is ``sum(len(self.hamiltonian(site, site)) for site in
- self.lead_interfaces[n])``. The output of ``leads[n].modes`` has to be a
- tuple of `~kwant.physics.PropagatingModes`, `~kwant.physics.StabilizedModes`.
+ For lead ``n``, the method leads[n].selfenergy must return a square
+ matrix whose size is ``sum(len(self.hamiltonian(site, site)) for
+ site in self.lead_interfaces[n])``. The output of ``leads[n].modes``
+ has to be a tuple of `~kwant.physics.PropagatingModes`,
+ `~kwant.physics.StabilizedModes`.
Often, the elements of `leads` will be instances of `InfiniteSystem`. If
this is the case for lead ``n``, the sites ``lead_interfaces[n]`` match
the first ``len(lead_interfaces[n])`` sites of the InfiniteSystem.
-
"""
@deprecate_args
@@ -752,7 +755,8 @@ class FiniteSystem(System, FiniteSystemMixin, metaclass=abc.ABCMeta):
pass
-class FiniteVectorizedSystem(VectorizedSystem, FiniteSystemMixin, metaclass=abc.ABCMeta):
+class FiniteVectorizedSystem(VectorizedSystem, FiniteSystemMixin,
+ metaclass=abc.ABCMeta):
pass
@@ -911,7 +915,8 @@ class InfiniteSystem(System, InfiniteSystemMixin, metaclass=abc.ABCMeta):
sparse=sparse, params=params)
-class InfiniteVectorizedSystem(VectorizedSystem, InfiniteSystemMixin, metaclass=abc.ABCMeta):
+class InfiniteVectorizedSystem(VectorizedSystem, InfiniteSystemMixin,
+ metaclass=abc.ABCMeta):
"""Abstract vectorized infinite low-level system.
An infinite system consists of an infinite series of identical cells.
--
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