Topological kinetic crossover in a nanomagnet array
Topological kinetic crossover in a nanomagnet array
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纳米磁体阵列中的拓扑动力学交叉
DOI:
10.1126/science.add6575
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发表时间:
2023
期刊:
影响因子:
56.9
通讯作者:
Schiffer, Peter
中科院分区:
文献类型:
--
作者:
Zhang, Xiaoyu;Fitez, Grant;Subzwari, Shayaan;Bingham, Nicholas S.;Chioar, Ioan-Augustin;Saglam, Hilal;Ramberger, Justin;Leighton, Chris;Nisoli, Cristiano;Schiffer, Peter
Ergodic kinetics, which are critical to equilibrium thermodynamics, can be constrained by a system’s topology. We studied a model nanomagnetic array in which such constraints visibly affect the behavior of the magnetic moments. In this system, magnetic excitations connect into thermally active one-dimensional strings whose motion can be imaged in real time. At high temperatures, our data showed the merging, breaking, and reconnecting of strings, resulting in the system transitioning between topologically distinct configurations. Below a crossover temperature, the string motion is dominated by simple changes in length and shape. In this low-temperature regime, the system is energetically stable because of its inability to explore all possible topological configurations. This kinetic crossover suggests a generalizable conception of topologically broken ergodicity and limited equilibration.
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影响因子:
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作者:
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通讯作者:
Henley, Christopher L.
DOI:
--
发表时间:
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期刊:
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通讯作者:
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