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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3554
DTSTART:20150430T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T142733Z
LAST-MODIFIED:20150416T202003Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Pushing GaAs to the extreme: from the 5/2 FQHE to spin qubits\
 , R. G. Herb Condensed Matter Seminar\, Mike Manfra\, Purdue Universit
 y
DESCRIPTION:The high mobility two-dimensional electron gas (2DEG) conf
 ined in GaAs/AlGaAs heterostructures is a model system for the discove
 ry of unique phases of electronic matter. For example the study of top
 ological phases which now permeates condensed matter physics has its o
 rigin in attempts to understand behavior in the 2DEG at high magnetic 
 fields in the quantum Hall regime.  It is speculated that specific top
 ological states in the quantum Hall regime may find utility in a speci
 al flavor of quantum computation protected against decoherence.  The 2
 DEG in GaAs has also been a playground for mesoscopic physics in which
  individual electrons are isolated in quantum dots.  These structures 
 are now studied as spin-based quantum bits (qubits). In this talk\, I 
 will describe how we actually create such physical systems in the labo
 ratory using molecular beam epitaxy and how each experiment places uni
 que demands on the design and operation of the underlying heterostruct
 ure.  In addition to our efforts to develop stable qubits\, I will dis
 cuss how we attempt to push the limits of 2DEG quality to uncover new 
 physics. Our recent efforts to understand the role of residual disorde
 r\, ever present in real samples\, have led to some surprising results
  that we believe has important consequences for the study of topologic
 al phases and quantum computing.
URL:https://www.physics.wisc.edu/events/?id=3554
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