Magnetic blue shift of Mott gaps enhanced by double exchange

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HAFEZ-TORBATI, Mohsen, Davide BOSSINI, Frithjof B. ANDERS, Götz S. UHRIG, 2021. Magnetic blue shift of Mott gaps enhanced by double exchange. In: Physical Review Research. American Physical Society. 3(4), 043232. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.3.043232

@article{HafezTorbati2021-12-30Magne-56061, title={Magnetic blue shift of Mott gaps enhanced by double exchange}, year={2021}, doi={10.1103/PhysRevResearch.3.043232}, number={4}, volume={3}, journal={Physical Review Research}, author={Hafez-Torbati, Mohsen and Bossini, Davide and Anders, Frithjof B. and Uhrig, Götz S.}, note={Article Number: 043232} }

<rdf:RDF xmlns:dcterms="" xmlns:dc="" xmlns:rdf="" xmlns:bibo="" xmlns:dspace="" xmlns:foaf="" xmlns:void="" xmlns:xsd="" > <rdf:Description rdf:about=""> <dspace:hasBitstream rdf:resource=""/> <dc:contributor>Anders, Frithjof B.</dc:contributor> <dc:contributor>Uhrig, Götz S.</dc:contributor> <dc:creator>Anders, Frithjof B.</dc:creator> <dcterms:available rdf:datatype="">2022-01-04T12:38:15Z</dcterms:available> <dc:contributor>Bossini, Davide</dc:contributor> <bibo:uri rdf:resource=""/> <dcterms:issued>2021-12-30</dcterms:issued> <dc:creator>Hafez-Torbati, Mohsen</dc:creator> <dcterms:isPartOf rdf:resource=""/> <dc:creator>Bossini, Davide</dc:creator> <dc:language>eng</dc:language> <dcterms:rights rdf:resource=""/> <dc:rights>Attribution 4.0 International</dc:rights> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dcterms:abstract xml:lang="eng">A substantial energy gap of charge excitations induced by strong correlations is the characteristic feature of Mott insulators. We study how the Mott gap is affected by long-range antiferromagnetic order. Our key finding is that the Mott gap is increased by the magnetic ordering: A magnetic blue shift (MBS) occurs. Thus the effect is proportional to the exchange coupling in the leading order in the Hubbard model. In systems with additional localized spins the double-exchange mechanism induces an additional contribution to the MBS which is proportional to the hopping in the leading order. The coupling between spin and charge degrees of freedom bears the potential to enable spin-to-charge conversion in Mott systems on extreme time scales determined by hopping and exchange only, since a spin-orbit-mediated transfer of angular momentum is not involved in the process. In view of spintronic and magnonic applications, it is highly promising to observe that several entire classes of compounds show exchange and double-exchange effects. Exemplarily, we show that the magnetic contribution to the band-gap blue shift observed in the optical conductivity of α-MnTe is correctly interpreted as the MBS of a Mott gap.</dcterms:abstract> <dcterms:hasPart rdf:resource=""/> <dcterms:title>Magnetic blue shift of Mott gaps enhanced by double exchange</dcterms:title> <dc:contributor>Hafez-Torbati, Mohsen</dc:contributor> <dc:date rdf:datatype="">2022-01-04T12:38:15Z</dc:date> <dc:creator>Uhrig, Götz S.</dc:creator> <dspace:isPartOfCollection rdf:resource=""/> </rdf:Description> </rdf:RDF>

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