Fingerprints of Universal Spin-Stiffness Jump in Two-Dimensional Ferromagnets

Roberto E. Troncoso, Arne Brataas, Asle Sudbø

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Motivated by recent progress on synthesizing two-dimensional magnetic van der Waals systems, we propose a setup for detecting the topological Berezinskii-Kosterlitz-Thouless phase transition in spin-transport experiments on such structures. We demonstrate that the spatial correlations of injected spin currents into a pair of metallic leads can be used to measure the predicted universal jump of 2/p in the ferromagnet spin stiffness as well as its predicted universal square root dependence on temperature as the transition is approached from below. Our setup provides a simple route to measuring this topological phase transition in two-dimensional magnetic systems, something which up to now has proven elusive. It is hoped that this will encourage experimental efforts to investigate critical phenomena beyond the standard Ginzburg-Landau paradigm in low-dimensional magnetic systems with no local order parameter.

Original languageEnglish
Article number237204
JournalPhysical Review Letters
Issue number23
StatePublished - 2 Dec 2020
Externally publishedYes


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