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[交流] 《物理评论快报》亮点进展:一维哈密顿系统的非平衡态相变

《物理评论快报》亮点进展:一维哈密顿系统的非平衡态相变

最近,厦门大学物理系王矫教授与意大利因苏布里亚大学Giulio Casati教授合作,在一维输运问题研究方面取得重要进展。该项研究以“One-Dimensional Self-Organization and Nonequilibrium Phase Transition in a Hamiltonian System”为题于2017年1月27日发表于《物理评论快报》 (Physical Review Letters, 2017; DOI: 10.1103/PhysRevLett.118.040601)
平衡态相变依赖于系统的维数。自上世纪五十年代起,人们就已认识到一般情况下一维系统中不会发生平衡态相变。另一方面,非平衡态相变也广泛存在于二、三维耗散系统,从未在一维非耗散系统中被发现过。最近,厦门大学物理系王矫教授与意大利因苏布里亚大学Giulio Casati教授合作,在一个一维哈密顿系统中发现了自组织及非平衡态相变。这一发现因其“特别的重要性、创新性和能够引起广泛关注(particular importance, innovation, and broad appeal)”而被著名物理学学术期刊《物理评论快报》选为编辑推荐论文发表。

该工作不仅表明一维非耗散、具有确定性动力学的系统能够发生非平衡态相变和自组织,也指出有必要将传统的基于线性响应理论对一维输运问题的研究推广到超出线性响应理论的范围,为一维输运问题研究打开了一个新的探索方向,有望发现全新的物质与能量输运机制。

文章信息列表
One-Dimensional Self-Organization and Nonequilibrium Phase Transition in a Hamiltonian System, Jiao Wang and Giulio Casati, Physical Review Letters, 27 January 2017, DOI: 10.1103/PhysRevLett.118.040601
Abstract: Self-organization and nonequilibrium phase transitions are well known to occur in two- and three- dimensional dissipative systems. Here, instead, we provide numerical evidence that these phenomena also occur in a one-dimensional Hamiltonian system. To this end, we calculate the heat conductivity by coupling the two ends of our system to two heat baths at different temperatures. It is found that when the temperature difference is smaller than a critical value, the heat conductivity increases with the system size in power law with an exponent considerably smaller than 1. However, as the temperature difference exceeds the critical value, the system's behavior undergoes a transition and the heat conductivity tends to diverge linearly with the system size. Correspondingly an ordered structure emerges. These findings suggest a new direction for exploring the transport problems in one dimension.

参考文献
[1] G. Benenti, G. Casati, and J. Wang, Phys. Rev. Lett. 110, 070604 (2013).
[2] S. Chen, J. Wang, G. Casati, and G. Benenti, Phys. Rev. E 90, 032134 (2014).
[3] S. Chen, J. Wang, G. Casati, and G. Benenti, Phys. Rev. E 92, 032139 (2015).
[4] J. Wang, G. Casati, T. Prosen, and C.-H. Lai, Phys. Rev. E 80, 031136 (2009).

全文链接
http://journals.aps.org/prl/abst ... sRevLett.118.040601
http://dspace.xmu.edu.cn/handle/2288/127730
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