Frustration-induced emergent Hilbert space fragmentation
Frustration-induced emergent Hilbert space fragmentation
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挫折引起的希尔伯特空间碎片
DOI:
10.1103/physrevb.103.235133
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发表时间:
2021
影响因子:
3.7
通讯作者:
Changlani, Hitesh J.
中科院分区:
文献类型:
--
作者:
Lee, Kyungmin;Pal, Arijeet;Changlani, Hitesh J.
Although most quantum systems thermalize locally on short timescales independent of initial conditions, recent developments have shown this is not always the case. Lattice geometry and quantum mechanics can conspire to produce constrained quantum dynamics and associated glassy behavior, a phenomenon that falls outside the rubric of the eigenstate thermalization hypothesis. Constraints “fragment” the many-body Hilbert space due to which some states remain insulated from others and the system fails to attain thermal equilibrium. Such fragmentation is a hallmark of geometrically frustrated magnets with low-energy “icelike manifolds” exhibiting a broad range of relaxation times for different initial states. Focusing on the highly frustrated kagome lattice, we demonstrate these phenomena in the Balents-Fisher-Girvin Hamiltonian (easy-axis regime), and a three-coloring model (easy-plane regime), both with constrained Hilbert spaces. We study their level statistics and relaxation dynamics to develop a coherent picture of fragmentation in various limits of the XXZ model on the kagome lattice.
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