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Article: Theory for metal hydrides with switchable optical properties

TitleTheory for metal hydrides with switchable optical properties
Authors
Issue Date1999
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 1999, v. 59 n. 8, p. 5398-5413 How to Cite?
AbstractRecently it has been discovered that lanthanum, yttrium, and other metal hydride films show dramatic changes in the optical properties at the metal-insulator transition. Such changes on a high-energy scale suggest the electronic structure is best described by a local model based on negatively charged hydrogen (H-) ions. We develop a many-body theory for the strong correlation in a H- ion lattice. The metal hydride is described by a large U limit of an Anderson lattice model. We use lanthanum hydride as a prototype of these compounds, and find that LaH3 is an insulator with a substantial gap consistent with experiments. It may be viewed either as a Kondo insulator or a band insulator due to strong electron correlation. A H vacancy state in LaH3 is found to be highly localized due to the strong bonding between the electron orbitals of hydrogen and metal atoms. Unlike the impurity states in the usual semiconductors, there is only weak internal optical transitions within the vacancy. The metal-insulator transition takes place in a band of these vacancy states. ©1999 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/175124
ISSN
2001 Impact Factor: 3.07
References

 

DC FieldValueLanguage
dc.contributor.authorNg, KKen_US
dc.contributor.authorZhang, FCen_US
dc.contributor.authorAnisimov, VIen_US
dc.contributor.authorRice, TMen_US
dc.date.accessioned2012-11-26T08:49:20Z-
dc.date.available2012-11-26T08:49:20Z-
dc.date.issued1999en_US
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 1999, v. 59 n. 8, p. 5398-5413en_US
dc.identifier.issn0163-1829en_US
dc.identifier.urihttp://hdl.handle.net/10722/175124-
dc.description.abstractRecently it has been discovered that lanthanum, yttrium, and other metal hydride films show dramatic changes in the optical properties at the metal-insulator transition. Such changes on a high-energy scale suggest the electronic structure is best described by a local model based on negatively charged hydrogen (H-) ions. We develop a many-body theory for the strong correlation in a H- ion lattice. The metal hydride is described by a large U limit of an Anderson lattice model. We use lanthanum hydride as a prototype of these compounds, and find that LaH3 is an insulator with a substantial gap consistent with experiments. It may be viewed either as a Kondo insulator or a band insulator due to strong electron correlation. A H vacancy state in LaH3 is found to be highly localized due to the strong bonding between the electron orbitals of hydrogen and metal atoms. Unlike the impurity states in the usual semiconductors, there is only weak internal optical transitions within the vacancy. The metal-insulator transition takes place in a band of these vacancy states. ©1999 The American Physical Society.en_US
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_US
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_US
dc.titleTheory for metal hydrides with switchable optical propertiesen_US
dc.typeArticleen_US
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_US
dc.identifier.authorityZhang, FC=rp00840en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-4243753733en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-4243753733&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume59en_US
dc.identifier.issue8en_US
dc.identifier.spage5398en_US
dc.identifier.epage5413en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridNg, KK=7403178987en_US
dc.identifier.scopusauthoridZhang, FC=14012468800en_US
dc.identifier.scopusauthoridAnisimov, VI=10540279900en_US
dc.identifier.scopusauthoridRice, TM=7201893707en_US

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