β chain and the pure quartic chain is constructed. The heat flux in the two-segment lattice is studied to compare with that in the FPU-β lattice. The ratio of the heat flux of the two-segment lattice to the FPU-β lattice increases monotonically as temperature rises. We conclude that phonons are the majority energy carriers in the low temperature regime, while solitons become dominant carriers as the temperature increases. The spatiotemporal propagation of a momentum excitation traveling along the two-segment lattice is also investigated. Phonon packets excited in the FPU-β part are reflected at the interface while solitary waves can pass through the interface. This supports microscopically our conclusion on the energy carriers in the FPU-β lattice."/>     Energy carriers investigation in the Fermi-Pasta-Ulam <i>β</i> lattice
Acta Physica Sinica
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Acta Phys. Sin  2013, Vol. 62 Issue (8): 080504     doi:10.7498/aps.62.080504
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Energy carriers investigation in the Fermi-Pasta-Ulam β lattice
Yuan Zong-Qiang, Chu Min, Zheng Zhi-Gang
Beijing-Hong Kong-Singapore Joint Center for Nonlinear and Complex Studies, Department of Physics, Beijing Normal University, Beijing 100875, China
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