  While there are many physical processes showing subdiffusion and some useful
particle models for understanding the underlying mechanisms have been
established, a systematic study of subdiffusive energy transport is still
lacking. Here we present convincing evidence that the energy subdiffusion and
its antipersistent correlations take place in a Hamiltonian lattice system with
both harmonic nearest-neighbor and anharmonic long-range interactions. We
further understand the underlying mechanisms from the scattering of phonons and
discrete breathers. Our result sheds new light on understanding the extremely
slow energy transport.
