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1、PHYSICALREVIEWLETTERSweekendingPRL96,046411(2006)3FEBRUARY2006FermiSurfaceandAnisotropicSpin-OrbitCouplingofSb(111)StudiedbyAngle-ResolvedPhotoemissionSpectroscopy11,211,233K.Sugawara,T.Sato,S.Souma,T.Takahashi,M.Arai,andT.Sasaki1DepartmentofPhysics,TohokuUniversity,Sendai980-8578,J
2、apan2CREST,JapanScienceandTechnologyAgency(JST),Kawaguchi332-0012,Japan3ComputationalMaterialsScienceCenter,NIMS,1-2-1Sengen,Tsukuba,Ibaraki305-0047,Japan(Received3March2005;revisedmanuscriptreceived29July2005;published3February2006)High-resolutionangle-resolvedphotoemissionspectros
3、copyhasbeenperformedonSb(111)toeluci-datetheoriginofanomalouselectronicpropertiesingroup-Vsemimetalsurfaces.Thesurfacewasfoundtobemetallicdespitethesemimetalliccharacterofbulk.Weclearlyobservedtwosurface-derivedFermisurfaceswhicharelikelyspinsplit,demonstratingthatthespin-orbitinter
4、actionplaysadominantroleincharacterizingthesurfaceelectronicstatesofgroup-Vsemimetals.TheuniversalityordissimilarityoftheelectronicstructureinBiandSbisdiscussedinrelationtothegranularsuperconductivity,electron-phononcoupling,andsurfacechargeorspindensitywave.DOI:10.1103/PhysRevLett.
5、96.046411PACSnumbers:71.18.+y,73.20.r,73.25.+i,79.60.iBi-andSb-basednanostructurematerialshavegener-studieswerefocusedonBi,butfewontheothergroup-Vatedconsiderableinterestsincetheyshowavarietyofsemimetals[9,10].ComparativestudybySb,whichisaphysicalproperties,suchassuperconductivity
6、inBiclus-homologouselementandhassimilarstructuralparametersters[1],asemimetal-semiconductortransition,andaquan-tothoseofBi[9,11,12],wouldopenawaytoabetterandtumsizeeffectinthinfilms[2].Thesematerialsarealsocomprehensiveunderstandingoftheoriginoftheanoma-usefulindeviceapplicationsince
7、theiralloysandhetero-louselectronicpropertiesofBi=Sb-basednanostructurestructuresareusedforahighlyefficientthermoelectricmaterials.converter[3].Theseinterestingpropertiesowetothechar-InthisLetter,wereporthigh-resolutionARPESresultofacteristicelectronicstructureinherenttothesemimetals
8、,Sb(111).Weshowthat
