although i material are
one of the authors of disordered rhythm also phase coherence and acquires i two d
call that obsessed
we present evidence the disorder can drive phase fluctuations in two d systems
results the may help explain the super conducted insulator phase transition in disorder two d
super conductors
although this covered in nineteen eighty seven the underlying mechanism that explains their super conductivity
is still open here
i temperature copper oxide super conductors are made of stacks of weakly coupled planes of
atoms and the physics of this order to use systems seems to play a large
role in determining the material properties
we model the point of the super conductor with two parallel search for shape the
time examples are well controlled
all trickle gas
we show that the phase coherence of the plane spanish as faster than the fraction
of coherent atoms as we increase disorders
this reveals the disorder drive strong phase fluctuations in tv systems
these phase fluctuations in turn are expected to drive a transition from a high temperature
superconducting state to a normal state
but are harder to see in these materials
our experiment begins with an optically track three d pose einstein contents a rib idiom
eighty seven times
which we split into two i'm couple because i two d planes using intersecting laser
being
this order is introduced by optical spectral
which causes the atoms to be repelled regions of higher intensity
we're just disorders right by controlling intensity of the spectral be
to make measurements with suddenly turn off the confinement and the disorder
planes expand rapidly overlapping informing interference pattern seen absorption images
the visibility of these interference fringes
tells us the phase coherence of our clan
perpendicular to the interference pattern we observe the momentum of the atoms
and the two component distribution
with the incoherent formal atoms forming a broad background and which a coherent adam so
in the centre
we much about the temperature of our plans from the with the remote distribution as
well as a fraction of coherent at
we can adjust the initial phase based density of the atoms before adding the disorder
analogous to controlling the temperature
you know sell
this allows us to produce cue based i
with this order shrink along why
in face-to-face density along x
one phase diagram shows range visibility and the other shows go a higher fraction
without disorder
this fraction closely tracks the visibility of the interference
however as we increase the disorders right this is no longer true as can be
observed in the upper right corner
of the phase diagrams
where the coherent retraction phase diagram
is much darker than the visibility based
we can further quantify this by integrating the phase diagrams
along the phase based density s
clearly
these two quantities that tracking each other high disorders
although we don't see if a transition in a relatively small finite system
our results show that disorder generically dries phase fluctuations in quality systems
is phase fluctuations i thought to be a mechanism behind the superconducting phase transition in
high temperature super conductors and this is the first direct observation of disorder causing these
phase fluctuations