气候变化领域集成服务门户(CCPortal): Tunable nonequilibrium dynamics of field quenches in spin ice

CCPortal

DOI	10.1073/pnas.1317631111
	Tunable nonequilibrium dynamics of field quenches in spin ice
	Mostame S.; Castelnovo C.; Moessner R.; Sondhi S.L.
发表日期	2014
ISSN	0027-8424
起始页码	640
结束页码	645
卷号	111 期号:2
英文摘要	We present nonequilibrium physics in spin ice as a unique setting that combines kinematic constraints, emergent topological defects, and magnetic long-range Coulomb interactions. In spin ice, magnetic frustration leads to highly degenerate yet locally constrained ground states. Together, they form a highly unusual magnetic state-a "Coulomb phase"-whose excitations are point-like defects-magnetic monopoles-in the absence of which effectively no dynamics is possible. Hence, when they are sparse at low temperature, dynamics becomes very sluggish. When quenching the system from a monopole-rich to a monopole-poor state, a wealth of dynamical phenomena occur, the exposition of which is the subject of this article. Most notably, we find reaction diffusion behavior, slow dynamics owing to kinematic constraints, as well as a regime corresponding to the deposition of interacting dimers on a honeycomb lattice. We also identify potential avenues for detecting the magnetic monopoles in a regime of slow-moving monopoles. The interest in this model system is further enhanced by its large degree of tunability and the ease of probing it in experiment: With varying magnetic fields at different temperatures, geometric properties-including even the effective dimensionality of the system-can be varied. By monitoring magnetization, spin correlations or zero-field NMR, the dynamical properties of the system can be extracted in considerable detail. This establishes spin ice as a laboratory of choice for the study of tunable, slow dynamics.
英文关键词	Frustrated magnetism; Kinetically constrained models; Nonequilibrium dynamics and quenches; Reaction-diffusion processes
语种	英语
scopus关键词	dimer; article; chemical structure; geometry; kinematics; low temperature; magnet; magnetic field; magnetism; molecular dynamics; nuclear magnetic resonance; physics; priority journal; frustrated magnetism; kinetically constrained models; nonequilibrium dynamics and quenches; reaction-diffusion processes; Computer Simulation; Dimerization; Entropy; Kinetics; Magnetics; Metals, Rare Earth; Models, Chemical; Stochastic Processes
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158993
作者单位	Mostame, S., Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States; Castelnovo, C., Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom; Moessner, R., Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany; Sondhi, S.L., Department of Physics, Princeton University, Princeton, NJ 08544, United States
推荐引用方式 GB/T 7714	Mostame S.,Castelnovo C.,Moessner R.,et al. Tunable nonequilibrium dynamics of field quenches in spin ice[J],2014,111(2).
APA	Mostame S.,Castelnovo C.,Moessner R.,&Sondhi S.L..(2014).Tunable nonequilibrium dynamics of field quenches in spin ice.Proceedings of the National Academy of Sciences of the United States of America,111(2).
MLA	Mostame S.,et al."Tunable nonequilibrium dynamics of field quenches in spin ice".Proceedings of the National Academy of Sciences of the United States of America 111.2(2014).