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Towhomitmayconcern,ThepurposeofthisletteristocertifythatDr.***hasbeeninmylaboratoryasaVisitingScholarstartingfromSeptember1,2013toSeptember1,2014intheDepartmentofPhysicsattheUniversityof***.Duringthisperiod,Dr.***hasbeenworkingon***.Hehasbeenavaluablememberofmyresearchgroup.Iexpectthathewillcontinuetohaveaproductivecareer.Pleaseletmeknowifyouhaveanyquestions.Sincerelyyours,SignaturehereProfessor,DepartmentofPhysics,Universityof***