Enhanced mobility of high-frequency discrete breathers in a monatomic chain with odd anharmonicity

Publication date: Available online 22 March 2019Source: Physics Letters AAuthor(s): A. Shelkan, M. Klopov, V. HizhnyakovAbstractThe mobility of high-frequency discrete breathers in monatomic chains with nonlinear interatomic potentials of the nearest neighbors is considered. It was found that the odd (cubic and fifth) anharmonicity strongly affects the mobility of breathers, sharply increasing the distance that it propagates without being trapped. It was also found that the correctly chosen fifth anharmonicity leads to an inversion of stability between the bond-centered and site-centers breathers and to the low-radiative propagation of discrete breathers along the chain.

Source: Physics Letters A - March 24, 2019 Category: Physics Source Type: research