Exciton transport driven by spin excitations in an antiferromagnet

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43932956" target="_blank" >RIV/60461373:22310/25:43932956 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.nature.com/articles/s41565-025-02068-y" target="_blank" >https://www.nature.com/articles/s41565-025-02068-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41565-025-02068-y" target="_blank" >10.1038/s41565-025-02068-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Exciton transport driven by spin excitations in an antiferromagnet

Popis výsledku v původním jazyce

Optical quasiparticles called magnetic excitons recently emerged in magnetic van der Waals materials. Akin to the highly effective strategies developed for electrons, the strong interactions of these excitons with the spin degree of freedom may provide innovative solutions for long-standing challenges in optics, such as steering the flow of energy and information. Here we demonstrate the transport of excitons by spin excitations in the van der Waals antiferromagnetic semiconductor CrSBr. Our observations reveal ultrafast, nearly isotropic exciton propagation, substantially enhanced at the N &amp; eacute;el temperature, transient contraction and expansion of exciton clouds at low temperatures and superdiffusive behaviour in bilayer samples. These signatures largely defy description by commonly known exciton transport mechanisms. Instead, we attribute them to magnon currents induced by laser excitation. We propose that the drag forces exerted by these currents can effectively imprint characteristic properties of spin excitations onto the motion of excitons. The universal nature of the underlying magnon-exciton scattering promises the driving of excitons by magnons in other magnetic semiconductors and even in non-magnetic materials by proximity in heterostructures, merging the rich physics of magnetotransport with optics and photonics.

Název v anglickém jazyce

Exciton transport driven by spin excitations in an antiferromagnet

Popis výsledku anglicky

Optical quasiparticles called magnetic excitons recently emerged in magnetic van der Waals materials. Akin to the highly effective strategies developed for electrons, the strong interactions of these excitons with the spin degree of freedom may provide innovative solutions for long-standing challenges in optics, such as steering the flow of energy and information. Here we demonstrate the transport of excitons by spin excitations in the van der Waals antiferromagnetic semiconductor CrSBr. Our observations reveal ultrafast, nearly isotropic exciton propagation, substantially enhanced at the N &amp; eacute;el temperature, transient contraction and expansion of exciton clouds at low temperatures and superdiffusive behaviour in bilayer samples. These signatures largely defy description by commonly known exciton transport mechanisms. Instead, we attribute them to magnon currents induced by laser excitation. We propose that the drag forces exerted by these currents can effectively imprint characteristic properties of spin excitations onto the motion of excitons. The universal nature of the underlying magnon-exciton scattering promises the driving of excitons by magnons in other magnetic semiconductors and even in non-magnetic materials by proximity in heterostructures, merging the rich physics of magnetotransport with optics and photonics.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21000 - Nano-technology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Nanotechnology

ISSN

1748-3387

e-ISSN

1748-3395

Svazek periodika

21

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

nestránkováno

Kód UT WoS článku

001648969400001

EID výsledku v databázi Scopus

2-s2.0-105026291593