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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20200121T163112Z
LAST-MODIFIED:20161114T144754Z
DTSTART:20161114T201500Z
DTEND:20161114T211500Z
UID:event1684@bu.edu
URL:http://physics.bu.edu/events/show/1684
SUMMARY:Exact critical exponents for the antiferromagnetic quantum critical
point in and dimensions
DESCRIPTION:Featuring Peter Lunts\n\nPart of the Condensed Matter Theory Se
minar Series.\n\nThe antiferromagnetic quantum critical point is believed t
o exist in many unconventional superconductors\, such as high-Tc cuprates\,
heavy fermion compounds and iron-based superconductors. The strange metal
state above this critical point is the most common kind of non-Fermi liquid
found in nature\, and\, therefore\, gaining a theoretical understanding of
it is a key problem in condensed matter. We present a controlled approach
to this problem using a dimensional regularization technique\, extending th
e spatial dimension from to . We find an emergent control parameter\, whi
ch allows us to find exact values for the critical exponents of the theory
within a finite window of . We then use these exponents as an ansatz for t
he problem directly in . We again find the same emergent control parameter
\, and we confirm that our ansatz is exact in the IR. This gives us an exac
t description of the low-energy physics\, in which both fermions and bosons
do not have quasi-particle-like excitations\, and the specific heat of the
system violates hyperscaling.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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