Evidence for spin current driven Bose-Einstein condensation of magnons.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
11 Nov 2021
11 Nov 2021
Historique:
received:
14
04
2021
accepted:
22
10
2021
entrez:
12
11
2021
pubmed:
13
11
2021
medline:
13
11
2021
Statut:
epublish
Résumé
The quanta of magnetic excitations - magnons - are known for their unique ability to undergo Bose-Einstein condensation at room temperature. This fascinating phenomenon reveals itself as a spontaneous formation of a coherent state under the influence of incoherent stimuli. Spin currents have been predicted to offer electronic control of Bose-Einstein condensates, but this phenomenon has not been experimentally evidenced up to now. Here we show that current-driven Bose-Einstein condensation can be achieved in nanometer-thick films of magnetic insulators with tailored nonlinearities and minimized magnon interactions. We demonstrate that, above a certain threshold, magnons injected by the spin current overpopulate the lowest-energy level forming a highly coherent spatially extended state. We quantify the chemical potential of the driven magnon gas and show that, at the critical current, it reaches the energy of the lowest magnon level. Our results pave the way for implementation of integrated microscopic quantum magnonic and spintronic devices.
Identifiants
pubmed: 34764266
doi: 10.1038/s41467-021-26790-y
pii: 10.1038/s41467-021-26790-y
pmc: PMC8585877
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6541Subventions
Organisme : Deutsche Forschungsgemeinschaft (German Research Foundation)
ID : 416727653
Informations de copyright
© 2021. The Author(s).
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