Solution to the sign problem in a frustrated quantum impurity model
arXiv:1608.05144 · doi:10.1016/j.aop.2016.11.006
Abstract
In this work we solve the sign problem of a frustrated quantum impurity model consisting of three quantum spin-half chains interacting through an anti-ferromagnetic Heisenberg interaction at one end. We first map the model into a repulsive Hubbard model of spin-half fermions hopping on three independent one dimensional chains that interact through a triangular hopping at one end. We then convert the fermion model into an inhomogeneous one dimensional model and express the partition function as a weighted sum over fermion worldline configurations. By imposing a pairing of fermion worldlines in half the space we show that all negative weight configurations can be eliminated. This pairing naturally leads to the original frustrated quantum spin model at half filling and thus solves its sign problem.
19 pages, 9 figures, 4 tables
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- Low-rank quantics tensor train representations of Feynman diagrams for multiorbital electron-phonon models
- Reduction of the sign problem near in quantum Monte Carlo simulations
- Disentanglement Approach to Quantum Spin Ground States: Field Theory and Stochastic Simulation
- Fermion Bag Approach for Hamiltonian Lattice Field Theories
- Sampling and the complexity of nature