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SUMMARY:[virtual NT/RIKEN seminar] Quantum criticality in fermion-bag insp
ired Hamiltonian lattice field theories
DTSTART;VALUE=DATE-TIME:20200515T150000Z
DTEND;VALUE=DATE-TIME:20200515T160000Z
DTSTAMP;VALUE=DATE-TIME:20220925T024600Z
UID:indico-event-8290@indico.bnl.gov
DESCRIPTION:Speakers: Emilie Huffman (Perimeter Institute)\n\nMotivated by
the fermion bag approach--a quantum Monte Carlo approach that takes advan
tage of grouped local degrees of freedom--we consider a new class of Hamil
tonian lattice field theories that can help us study fermionic quantum cri
tical points. We construct the partition function of a lattice Hamiltonian
in 2+1 dimensions in discrete time\, with a temporal lattice spacing \\v
arepsilon. When \\varepsilon \\rightarrow 0\, we obtain the partition func
tion of the original lattice Hamiltonian. But when \\varepsilon = 1\, we o
btain a new type of space-time lattice field theory which treats space and
time differently\, but still lacks fermion doubling in the time dimension
\, in contrast to Lagrangian lattice field theories. Here we show that bot
h continuous-time and discrete-time lattice field theories derived from th
e t-V model have a fermionic quantum critical point with critical exponen
ts that match within errors. The fermion bag algorithms run relatively fas
ter on the discrete-time model and allow us to compute quantities even on
100^3 lattices near the quantum critical point.\n\nhttps://indico.bnl.gov
/event/8290/
LOCATION:Bluejeans
URL:https://indico.bnl.gov/event/8290/
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