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SupportingInformationAtomicPropertiesofMonoclinicAg2SeThinFilmGrownonSrTiO3SubstratebyMolecularBeamEpitaxySamiraDaneshmandi,*,†,‡YanfengLyu,†,‡TahaSalavati-fard,#,‡HanmingYuan,†,‡MoeinAdnani,†,‡LarsC.Grabow,#,‡andChing-WuChu*,†,‡,§†DepartmentofPhysics,UniversityofHouston,Houston,TX77204USA‡TexasCenterforSuperconductivity,UniversityofHouston,Houston,TX77204USA#DepartmentofChemicalandBiomolecularEngineering,UniversityofHouston,Houston,TX77204,USA§LawrenceBerkeleyNationalLaboratory,Berkeley,CA94720,USAAUTHORINFORMATIONCorrespondingAuthorsSamiraDaneshmandi,Email:sdaneshmandi@uh.eduChing-WuChu,Email:cwchu@uh.eduS1
1FigureS1.Identificationofislandorientationindifferentin-planedirectionsonthesurfaceofaAg2Sethinfilm.(a-c)AtomicallyresolvedSTMtopographicimagesofflatareaswithhexagonal-likeatomicarrangementonthesurfacesofdifferentislandsontheAg2Sethinfilm(Vb=40mV,It=200pA).Theout-of-planedirectionis(001).(d-f)FFTpatternsrespectivelycorrespondingtothetopographicimagesin(a-c).Differentorientationsofthereciprocallatticesondifferentislandsconfirmthattheislandsorientindifferentin-planedirectionsonthesurfaceoftheAg2Sethinfilm.ThiscanalsoexplainthedisappearanceoftheRHEEDpatternquicklyafterthegrowthbegananditsabsenceduringthegrowth.S2
2FigureS2.(a)Heightprofilemeasurementswithdifferentsamplebiasesalongthesamesteponthe(101$)planeandcorrespondingtotheblackandorangedashedlinesintheinset.Black:Vb=1.0V,It=21pA;orange:Vb=3.0V,It=23pA.Inset:Vb=1.0V,It=21pA(b)Heightprofilemeasurementswiththesamesamplebiasandtunnelingcurrent(Vb=3.0V,It=16pA)alongdifferentstepsonthe(110)planeandcorrespondingtotheblackandorangedashedlinesintheinsets.Eachimageshownintheinsetsto(a)and(b)representsasamplesurfaceareaof30nm×30nm.S3
3FigureS3.Small-scaledI/dVspectraoftheflathexagonal-likeregionoftheAg2Sefilmsurfacerangingfrom–0.7to0.5V(Vb=0.5V,It=200pA).Solidanddashedbluecurvesrepresentdataobtainedatthecenteroftheisland,correspondingto1and2,respectively,intheinset(Vb=3V,It=17pA).Solidanddashedredcurvesrepresentdataobtainedneartheedgeoftheisland,correspondingto3and4,respectively,intheinset,andaremultipliedby8inordertoshowtheirfeaturesclearly.ThedI/dVspectrumofaAgfilm(greencurve)isplottedasareference.S4
4FigureS4.TopographyandelectronicpropertiesofAg2Sethinfilmafterintroducingadsorbates.(a)Typicalconstant-currentSTMtopographicimageoftheflatareasonthesurfaceofaAg2Sethinfilmafterintroducingadsorbates(Vb=2.0V,It=20pA)andits(b)atomicallyresolvedSTMtopographicimage(Vb=125mV,It=200pA).(c)Large-and(d)small-scaledI/dVspectrarangingfrom-3.0to3.0V(Vb=3.0V,It=200pA)andfrom-0.5to0.5V(Vb=0.5V,It=200pA),respectively,fortheAg2Sethinfilmafterintroducingadsorbates.ThedI/dVspectraneartheFermilevelchangetoverylowDOSvalues,whichpreventsscanningatlowvoltages.S5
