<s>
A	O
break	B-Algorithm
junction	I-Algorithm
is	O
an	O
electronic	O
device	O
which	O
consists	O
of	O
two	O
metal	O
wires	O
separated	O
by	O
a	O
very	O
thin	O
gap	O
,	O
on	O
the	O
order	O
of	O
the	O
inter-atomic	O
spacing	O
(	O
less	O
than	O
a	O
nanometer	O
)	O
.	O
</s>
<s>
First	O
is	O
a	O
regime	O
where	O
the	O
break	B-Algorithm
junction	I-Algorithm
comprises	O
a	O
quantum	O
point	O
contact	O
.	O
</s>
<s>
Break	B-Algorithm
junctions	I-Algorithm
are	O
used	O
to	O
make	O
electrical	O
contacts	O
to	O
study	O
single	O
molecules	O
.	O
</s>
