Kinked Entropy and Discontinuous Microcanonical Spontaneous Symmetry Breaking

doi:10.1103/PhysRevLett.122.160601

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	Kinked Entropy and Discontinuous Microcanonical Spontaneous Symmetry Breaking
	Zhou, HJ
刊名	PHYSICAL REVIEW LETTERS
	2019
卷号	122 期号:16 页码:160601
关键词	DROPLETS
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.122.160601
英文摘要	Spontaneous symmetry breaking (SSB) in statistical physics is a macroscopic collective phenomenon. For the paradigmatic Q-state Potts model it means a transition from the disordered color-symmetric phase to an ordered phase in which one color dominates. Existing mean field theories imply that SSB in the microcanonical statistical ensemble (with energy being the control parameter) should be a continuous process. Here we study microcanonical SSB on the random-graph Potts model and discover that the entropy is a kinked function of energy. This kink leads to a discontinuous phase transition at certain energy density value, characterized by a jump in the density of the dominant color and a jump in the microcanonical temperature. This discontinuous SSB in random graphs is confirmed by microcanonical Monte Carlo simulations, and it is also observed in bond-diluted finite-size lattice systems.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23447]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhou, HJ. Kinked Entropy and Discontinuous Microcanonical Spontaneous Symmetry Breaking[J]. PHYSICAL REVIEW LETTERS,2019,122(16):160601.
APA	Zhou, HJ.(2019).Kinked Entropy and Discontinuous Microcanonical Spontaneous Symmetry Breaking.PHYSICAL REVIEW LETTERS,122(16),160601.
MLA	Zhou, HJ."Kinked Entropy and Discontinuous Microcanonical Spontaneous Symmetry Breaking".PHYSICAL REVIEW LETTERS 122.16(2019):160601.