物理学科Seminar第592讲 低维晶体材料中的非线性载流子:激波与孤子

创建时间:  2022/11/11  龚惠英   浏览次数:   返回

报告题目 (Title):Nonlinear Energy Carriers in Low-dimensional Crystalline Solids: Shockwaves and Solitons(低维晶体材料中的非线性载流子:激波与孤子)

报告人 (Speaker): 陈济舸 副研究员 (中国科学院上海高等研究院)

报告时间 (Time):2022年11月14日(周一) 10:00-12:00

报告地点 (Place):腾讯会议(会议号: 940-737-046)

邀请人(Inviter):郭盼

主办部门:理学院物理系

报告摘要:

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.

上一条:数学学科Seminar第2325讲 从Whipple的3F2求和式的q-模拟得到的q-同余式

下一条:纳米中心学术报告 单胶束定向组装合成功能介孔材料


物理学科Seminar第592讲 低维晶体材料中的非线性载流子:激波与孤子

创建时间:  2022/11/11  龚惠英   浏览次数:   返回

报告题目 (Title):Nonlinear Energy Carriers in Low-dimensional Crystalline Solids: Shockwaves and Solitons(低维晶体材料中的非线性载流子:激波与孤子)

报告人 (Speaker): 陈济舸 副研究员 (中国科学院上海高等研究院)

报告时间 (Time):2022年11月14日(周一) 10:00-12:00

报告地点 (Place):腾讯会议(会议号: 940-737-046)

邀请人(Inviter):郭盼

主办部门:理学院物理系

报告摘要:

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.

上一条:数学学科Seminar第2325讲 从Whipple的3F2求和式的q-模拟得到的q-同余式

下一条:纳米中心学术报告 单胶束定向组装合成功能介孔材料