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Article: Formation of energy gap in high-dimensional spin-orbital liquids

TitleFormation of energy gap in high-dimensional spin-orbital liquids
Authors
KeywordsPhysics
Issue Date2002
PublisherInstitute of Physics Publishing Ltd.. The Journal's web site is located at http://iopscience.iop.org/0295-5075
Citation
Europhysics Letters, 2002, v. 57 n. 2, p. 274-280 How to Cite?
AbstractA Schwinger boson mean-field theory is developed for spin liquids in a symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled spin-orbital operators are treated equally. We evaluate the dynamic correlation functions and collective excitations spectra. As the collective excitations have a finite energy gap, we conclude that the ground state is a spin-orbital liquid with a two-fold degeneracy, which breaks the discrete spin-orbital symmetry. Based on this conclusion, we propose that broken symmetry or symmetric frustration instead of geometric quantum frustration provides a new route to explore the spin liquid states. Possible relevence of this spin liquid state to several realistic systems, such as CaV 4O 9 and Na 2Sb 2Ti 2O, are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/42464
ISSN
2015 Impact Factor: 1.963
2015 SCImago Journal Rankings: 0.565
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShen, SQen_HK
dc.contributor.authorZhang, GMen_HK
dc.date.accessioned2007-01-29T08:50:34Z-
dc.date.available2007-01-29T08:50:34Z-
dc.date.issued2002en_HK
dc.identifier.citationEurophysics Letters, 2002, v. 57 n. 2, p. 274-280en_HK
dc.identifier.issn0295-5075en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42464-
dc.description.abstractA Schwinger boson mean-field theory is developed for spin liquids in a symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled spin-orbital operators are treated equally. We evaluate the dynamic correlation functions and collective excitations spectra. As the collective excitations have a finite energy gap, we conclude that the ground state is a spin-orbital liquid with a two-fold degeneracy, which breaks the discrete spin-orbital symmetry. Based on this conclusion, we propose that broken symmetry or symmetric frustration instead of geometric quantum frustration provides a new route to explore the spin liquid states. Possible relevence of this spin liquid state to several realistic systems, such as CaV 4O 9 and Na 2Sb 2Ti 2O, are discussed.en_HK
dc.format.extent139151 bytes-
dc.format.extent26624 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd.. The Journal's web site is located at http://iopscience.iop.org/0295-5075 en_HK
dc.relation.ispartofEurophysics Lettersen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsEurophysics Letters. Copyright © E D P Sciences.en_HK
dc.rightsThe original publication is available at www.edpsciences.org/agroen_HK
dc.subjectPhysicsen_HK
dc.titleFormation of energy gap in high-dimensional spin-orbital liquidsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0295-5075&volume=57&issue=2&spage=274&epage=280&date=2002&atitle=Formation+of+energy+gap+in+high-dimensional+spin-orbital+liquidsen_HK
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_HK
dc.identifier.authorityShen, SQ=rp00775en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1209/epl/i2002-00572-5en_HK
dc.identifier.scopuseid_2-s2.0-0036337333en_HK
dc.identifier.hkuros65636-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036337333&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume57en_HK
dc.identifier.issue2en_HK
dc.identifier.spage274en_HK
dc.identifier.epage280en_HK
dc.identifier.isiWOS:000173821100019-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridShen, SQ=7403431266en_HK
dc.identifier.scopusauthoridZhang, GM=7405267554en_HK

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