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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-9047
DTSTART:20250417T150000Z
DTEND:20250417T230000Z
DTSTAMP:20260413T171619Z
LAST-MODIFIED:20241227T174306Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Field theory of monitored\, interacting fermions with charge-c
 onservation\, R. G. Herb Condensed Matter Seminar\, Matthew Foster\, R
 ice University
DESCRIPTION:The dynamics of entanglement in monitored quantum circuits
  has opened up a new chapter in far-from-equilibrium\, quantum many-bo
 dy physics. Charge-conserving dynamics of 1D free fermions monitored b
 y local charge measurements are known to possess only an area-law enta
 ngled phase\, with no measurement-induced phase transition (MIPT). We 
 formulate the more interesting problem for monitored dynamics of inter
 acting fermions\, using the Keldysh formalism. We derive a simple effe
 ctive statistical mechanics model for the system. We show that\, as so
 on as local density interactions are turned on\, the volume-law entang
 led phase and the MIPT into an area-law phase appear\, the latter desc
 ribed by a separatrix in the weak-coupling RG flow. Invoking general s
 ymmetry principles\, our theory also naturally exhibits the “charge-
 fuzzy” and “‘charge-sharpened” phases\, as well as the “char
 ge-sharpening” transition of KT type\, identified in previous work. 
 We explain how the simple effective stat. mech. model that we obtain i
 s made possible by the heating effects of the measurements\, which tri
 vialize the fermion distribution function whilst still admitting a pan
 oply of dynamical phases and transitions.
URL:https://www.physics.wisc.edu/events/?id=9047
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