  We study the ground state phase diagram of a one-dimensional hard-core
bosonic model with nearest-neighbor interactions (XXZ model) where every site
is coupled Ohmically to an independent but identical reservoir, hereby
generalizing spin-boson models to interacting spin-boson systems. We show that
a bath-induced Bose metal phase can occur in the ground state phase diagram
away from half filling. This phase is compressible, gapless, and conducting but
not superfluid. At haf-filling, only a Luttinger liquid and a charge density
wave are found. The phase transition between them is of Kosterlitz-Thouless
type where the Luttinger parameter takes a non-universal value.The applied
quantum Monte Carlo method can be used for all open bosonic and unfrustrated
spin systems, regardless of their dimension, filling factor and spectrum of the
dissipation as long as the quantum system couples to the bath via the density
operators.
