»ã±¨±êÌâ (Title)£ºNonlinear Energy Carriers in Low-dimensional Crystalline Solids: Shockwaves and Solitons£¨µÍά¾§Ìå×ʲÂÖеķÇÏßÐÔÔØÁ÷×Ó£º¼¤²¨Óë¹Â×Ó£©

»ã±¨ÈË (Speaker)£º ³Â¼Ãô´ ¸±×êÑÐÔ± (Öйú¿ÆѧԺÉϺ£¸ßµµ×êÑÐÔº)

»ã±¨¹¦·ò (Time)£º2022Äê11ÔÂ14ÈÕ(ÖÜÒ») 10£º00-12£º00

»ã±¨µØÖ· (Place)£ºÌÚѶ»áÒé 940-737-046

Ô¼ÇëÈË(Inviter)£º¹ùÅÎ

Ö÷°ì²¿ÃÅ£ºÀíѧԺÎïÀíϵ

»ã±¨ÌáÒª£º

It was long believed that, as pointed out by Peierls, even close to the melting point the excitations in ordinary three-dimensional crystalline solids are so small that the nonlinear waves like solitons can be neglected. As a result, a thorough and satisfactory understanding of energy transport beyond the low-temperature region in solid crystalline materials is still missing. We disagree with this idea and suggest a crossover of wave-packet dynamic from phonon- to nonlinear wave-dominated (shock wave or soliton dominated) state in some two-dimensional materials at high temperatures far below its melting point in some low-dimensional materials. Excitation of nonlinear energy carriers, i.e., shock waves and solitons, determines the scaling relations in the anomalous thermal conduction process. The crossover relates to a second-order phase transition where the superposition symmetry of linear waves (phonons) is broken due to the enhanced nonlinearity at high temperatures. We further suggest a mediation strategy to manipulate thermal conductivity through long-lived solitons over a wide range in low-dimensional nonlinear crystalline solids.