0:00:03although i material are
0:00:05one of the authors of disordered rhythm also phase coherence and acquires i two d
0:00:08call that obsessed
0:00:10we present evidence the disorder can drive phase fluctuations in two d systems
0:00:14results the may help explain the super conducted insulator phase transition in disorder two d
0:00:18super conductors
0:00:20although this covered in nineteen eighty seven the underlying mechanism that explains their super conductivity
0:00:24is still open here
0:00:27i temperature copper oxide super conductors are made of stacks of weakly coupled planes of
0:00:31atoms and the physics of this order to use systems seems to play a large
0:00:34role in determining the material properties
0:00:37we model the point of the super conductor with two parallel search for shape the
0:00:41time examples are well controlled
0:00:43all trickle gas
0:00:44we show that the phase coherence of the plane spanish as faster than the fraction
0:00:48of coherent atoms as we increase disorders
0:00:50this reveals the disorder drive strong phase fluctuations in tv systems
0:00:55these phase fluctuations in turn are expected to drive a transition from a high temperature
0:00:59superconducting state to a normal state
0:01:01but are harder to see in these materials
0:01:05our experiment begins with an optically track three d pose einstein contents a rib idiom
0:01:10eighty seven times
0:01:11which we split into two i'm couple because i two d planes using intersecting laser
0:01:16being
0:01:17this order is introduced by optical spectral
0:01:20which causes the atoms to be repelled regions of higher intensity
0:01:23we're just disorders right by controlling intensity of the spectral be
0:01:29to make measurements with suddenly turn off the confinement and the disorder
0:01:33planes expand rapidly overlapping informing interference pattern seen absorption images
0:01:38the visibility of these interference fringes
0:01:41tells us the phase coherence of our clan
0:01:43perpendicular to the interference pattern we observe the momentum of the atoms
0:01:47and the two component distribution
0:01:49with the incoherent formal atoms forming a broad background and which a coherent adam so
0:01:54in the centre
0:01:55we much about the temperature of our plans from the with the remote distribution as
0:01:59well as a fraction of coherent at
0:02:02we can adjust the initial phase based density of the atoms before adding the disorder
0:02:06analogous to controlling the temperature
0:02:08you know sell
0:02:10this allows us to produce cue based i
0:02:13with this order shrink along why
0:02:16in face-to-face density along x
0:02:18one phase diagram shows range visibility and the other shows go a higher fraction
0:02:22without disorder
0:02:24this fraction closely tracks the visibility of the interference
0:02:27however as we increase the disorders right this is no longer true as can be
0:02:32observed in the upper right corner
0:02:33of the phase diagrams
0:02:35where the coherent retraction phase diagram
0:02:37is much darker than the visibility based
0:02:40we can further quantify this by integrating the phase diagrams
0:02:44along the phase based density s
0:02:47clearly
0:02:47these two quantities that tracking each other high disorders
0:02:52although we don't see if a transition in a relatively small finite system
0:02:56our results show that disorder generically dries phase fluctuations in quality systems
0:03:01is phase fluctuations i thought to be a mechanism behind the superconducting phase transition in
0:03:06high temperature super conductors and this is the first direct observation of disorder causing these
0:03:10phase fluctuations