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Solution to new sign problems with Hamiltonian Lattice Fermions

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Authors
Huffman, Emilie
Chandrasekharan, Shailesh
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Abstract
We present a solution to the sign problem in a class of particle-hole symmetric Hamiltonian lattice fermion models on bipartite lattices using the idea of fermion bags. The solution remains valid when the particle-hole symmetry is broken through a staggered chemical potential term. This solution allows, for the first time, simulations of some massless four-fermion models with minimal fermion doubling and with an odd number of fermion flavors using ultra-local actions. One can thus study a variety of quantum phase transitions that have remained unexplored so far due to sign problems.
Type
Journal article
Subject
hep-lat
hep-lat
cond-mat.str-el
nucl-th
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https://hdl.handle.net/10161/10362
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Scholars@Duke

Chandrasekharan

Shailesh Chandrasekharan

Professor of Physics
Prof. Chandrasekharan is interested in understanding quantum field theories non-perturbatively from first principles calculations. His research focuses on lattice formulations of these theories with emphasis on strongly correlated fermionic systems of interest in condensed matter, particle and nuclear physics. He develops novel Monte-Carlo algorithms to study these problems. He is particularly excited about solutions to the notoriously difficult <a href="http://en.wikipedia.org/wiki/Numerical_si
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