Magnetically confined surface and bulk excitons in a layered antiferromagnet
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43932196" target="_blank" >RIV/60461373:22310/25:43932196 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s41563-025-02129-6" target="_blank" >https://www.nature.com/articles/s41563-025-02129-6</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41563-025-02129-6" target="_blank" >10.1038/s41563-025-02129-6</a>
Alternative languages
Result language
angličtina
Original language name
Magnetically confined surface and bulk excitons in a layered antiferromagnet
Original language description
The discovery of two-dimensional van der Waals magnets has greatly expanded our ability to create and control nanoscale quantum phases. A unique capability emerges when a two-dimensional magnet is also a semiconductor that features tightly bound excitons with large oscillator strengths that fundamentally determine the optical response and are tunable with magnetic fields. Here we report a previously unidentified type of optical excitation-a magnetic surface exciton-enabled by the antiferromagnetic spin correlations that confine excitons to the surface of CrSBr. Magnetic surface excitons exhibit stronger Coulomb attraction, leading to a higher binding energy than excitons confined in bulk layers, and profoundly alter the optical response of few-layer crystals. Distinct magnetic confinement of surface and bulk excitons is established by layer- and temperature-dependent exciton reflection spectroscopy and corroborated by ab initio many-body perturbation theory calculations. By quenching interlayer excitonic interactions, the antiferromagnetic order of CrSBr strictly confines the bound electron-hole pairs within the same layer, regardless of the total number of layers. Our work unveils unique confined excitons in a layered antiferromagnet, highlighting magnetic interactions as a vital approach for nanoscale quantum confinement, from few layers to the bulk limit.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
NATURE MATERIALS
ISSN
1476-1122
e-ISSN
1476-4660
Volume of the periodical
24
Issue of the periodical within the volume
3
Country of publishing house
GB - UNITED KINGDOM
Number of pages
18
Pages from-to
391-398
UT code for WoS article
001425279700001
EID of the result in the Scopus database
2-s2.0-85218093691