  We study heat conduction through one-dimensional homogeneous lattices in the
presence of the nonlinear on-site potentials containing the bounded and
unbounded parts, and the harmonic interaction potential. We observe the
occurrence of double negative differential thermal resistance (NDTR), namely,
there exist two regions of temperature difference, where the heat flux
decreases as the applied temperature difference increases. The nonlinearity of
the bounded part contributes to NDTR at low temperatures and NDTR at high
temperatures is induced by the nonlinearity of the unbounded part. The
nonlinearity of the on-site potentials is necessary to obtain NDTR for the
harmonic interaction homogeneous lattices. However, for the anharmonic
homogeneous lattices, NDTR even occurs in the absence of the on-site
potentials, for example the rotator model.
