Related papers: Luttinger liquid tensor network: sine versus tangent dispersion of massless Dirac fermions

Luttinger liquid tensor network: sine versus tangent dispersion of massless Dirac fermions

URL: http://arxiv.org/abs/2407.06713v1
Date: Tue, 9 Jul 2024 09:39:58 GMT
Title: Luttinger liquid tensor network: sine versus tangent dispersion of massless Dirac fermions
Authors: V. A. Zakharov, S. Polla, A. Donís Vela, P. Emonts, M. J. Pacholski, J. Tworzydło, C. W. J. Beenakker,
Abstract summary: We apply the powerful many-body techniques of tensor networks to massless Dirac fermions. Our construction of a tensor network with an unpaired Dirac cone works around the fermion-doubling obstruction.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: To apply the powerful many-body techniques of tensor networks to massless Dirac fermions one wants to discretize the $p\cdot\sigma$ Hamiltonian and construct a matrix-product-operator (MPO) representation. We compare two alternative discretization schemes, one with a sine dispersion, the other with a tangent dispersion, applied to a one-dimensional Luttinger liquid with Hubbard interaction. Both types of lattice fermions allow for an exact MPO representation of low bond dimension, so they are efficiently computable, but only the tangent dispersion gives a power law decay of the propagator in agreement with the continuum limit: The sine dispersion is gapped by the interactions, evidenced by an exponentially decaying propagator. Our construction of a tensor network with an unpaired Dirac cone works around the fermion-doubling obstruction by exploiting the fact that the \textit{nonlocal} Hamiltonian of tangent fermions permits a \textit{local} generalized eigenproblem.

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