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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4140
DTSTART:20160411T150000Z
DURATION:PT1H0M0S
DTSTAMP:20240328T110638Z
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.
\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.
\n
URL:https://www.physics.wisc.edu/events/?id=4140
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