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Observation of fluctuation-mediated picosecond nucleation of a topological phase. | LitMetric

AI Article Synopsis

  • Topological states of matter are intriguing due to their unique physics and stability, but creating these states quickly is challenging.
  • Researchers demonstrated the rapid emergence of a topological phase with multiple magnetic skyrmions within picoseconds, using real-time soft X-ray scattering after activating with infrared laser.
  • A transient topological fluctuation state, influenced by a specific magnetic field, helps lower the energy barrier for this rapid formation, offering insights into topological transitions and potential for ultrafast switching in various materials.

Article Abstract

Topological states of matter exhibit fascinating physics combined with an intrinsic stability. A key challenge is the fast creation of topological phases, which requires massive reorientation of charge or spin degrees of freedom. Here we report the picosecond emergence of an extended topological phase that comprises many magnetic skyrmions. The nucleation of this phase, followed in real time via single-shot soft X-ray scattering after infrared laser excitation, is mediated by a transient topological fluctuation state. This state is enabled by the presence of a time-reversal symmetry-breaking perpendicular magnetic field and exists for less than 300 ps. Atomistic simulations indicate that the fluctuation state largely reduces the topological energy barrier and thereby enables the observed rapid and homogeneous nucleation of the skyrmion phase. These observations provide fundamental insights into the nature of topological phase transitions, and suggest a path towards ultrafast topological switching in a wide variety of materials through intermediate fluctuating states.

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Source
http://dx.doi.org/10.1038/s41563-020-00807-1DOI Listing

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