<s>
Yambo	O
is	O
a	O
computer	O
software	O
package	O
for	O
studying	O
many-body	B-Algorithm
theory	I-Algorithm
aspects	O
of	O
solids	O
and	O
molecule	O
systems	O
.	O
</s>
<s>
It	O
is	O
an	O
open-source	B-Application
software	I-Application
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
.	O
</s>
<s>
two	O
dimensions	O
(	O
surfaces	O
)	O
and	O
one	O
dimension	O
(	O
e.g.	O
,	O
nanotubes	O
,	O
nanowires	B-Architecture
,	O
polymer	B-Language
chains	O
)	O
.	O
</s>
<s>
It	O
can	O
also	O
handle	O
collinear	O
(	O
i.e.	O
,	O
spin-polarized	B-General_Concept
wave	O
functions	O
)	O
and	O
non-collinear	O
(	O
spinors	O
)	O
magnetic	O
systems	O
.	O
</s>
<s>
Yambo	O
relies	O
on	O
many-body	B-Algorithm
perturbation	O
theory	O
and	O
time-dependent	O
density	O
functional	O
theory	O
.	O
</s>
<s>
Yambo	O
is	O
interfaced	O
with	O
plane-wave	O
density-functional	O
codes	O
:	O
ABINIT	B-Application
,	O
PWscf	B-Application
,	O
CPMD	B-Application
and	O
with	O
the	O
ETSF-io	O
library	O
.	O
</s>
<s>
For	O
random-access	B-Architecture
memory	I-Architecture
(	O
RAM	B-Architecture
)	O
the	O
requirements	O
may	O
vary	O
from	O
less	O
than	O
1	O
GB	O
to	O
few	O
GBs	O
,	O
depending	O
on	O
the	O
problem	O
.	O
</s>
<s>
Part	O
of	O
the	O
YAMBO	B-Application
code	I-Application
is	O
kept	O
under	O
a	O
private	O
repository	O
.	O
</s>
