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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4140
DTSTART:20160411T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T110628Z
LAST-MODIFIED:20160408T170133Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Non-ergodicity in many body systems and the phase diagram of J
 osephson junction chains\, Condensed Matter Theory Group Seminar\, Lev
  Ioffe\, Rutgers
DESCRIPTION:At very high disorder a generic closed quantum systems bec
 omes completely localized. I argue that this (many body) localization 
 is preempted by a wide regime of non-ergodic behavior that displays a 
 number of unusual properties. A good system to study these effects are
  Josephson junction arrays in a somewhat unusual regime. <br>
\nI revi
 ew the physics of Josephson arrays and the general problem of the supe
 rconductor-insulator transition in these structures.  In the main part
  of the talk I will focus on the novel phases appearing in one-dimensi
 onal  Josephson junction chains at relatively high temperatures. I wil
 l argue that these phases are robust with respect to the presence of t
 he ubiquitous random charges and thus allow experimental observation. 
 I show that at finite temperatures both ordered and disordered chains 
 display a dynamical transition to the many body localized state. While
  resistivity is strictly infinite in the many body localized state\, i
 t is exponentially large in the intermediate non-ergodic bad metal. I 
 will discuss the possibility of experimental observation of these tran
 sitions. <br>
\n
URL:https://www.physics.wisc.edu/events/?id=4140
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