12962

11851

كارشناسي ارشد

حالت جامد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

۱۳۹۶

ده، ۵۱ص.: مصور، جدول

فرهاد فضيله

علي اكبر بابايي

جواد هاشمي فر، پيمان صاحب سرا

1396/08/13

كتابنامه

فيزيك

فيزيك

ID11851

Abstract Topological insulators are two or three dimensional materials whi have insulting bulkand metallic surface states e metallic surface states of topological insulators have gaplesselectronic states that are protected by time reversal symmetry Topological insulators areappropriate to use in spintronic and nano electronic devices because of spin orbit couplingand novel electronic and magnetic properties Graphene is widely considered as a start point in recent carbon based nanostructure stud ies As a result of light atom the spin orbit coupling in graphene is weak As we deal withheavier atoms in the structure it may lead to stronger spin orbit coupling e strong spin orbit coupling plays an essential role in the formation of topological phases therefore adatomabsorption could be an e ective way to a ieve the goal Topological insulators was rst proposed by Kane and Mele on graphene la ice In thisthesis functional method in Kane Mele model is used to strengthen the topological phases Additionally in this thesis gap structure in Kane Mele model is studied e spin orbit cou pling of a 11 11 supercell whi made by graphene la ice with one uorine atom in topposition is calculated Finally the Kane Mele model and functionalizing state are compared As a result of comparing we realized that graphene atoms with uorine atom in top hasstronger spin orbit coupling ese anges have important consequences on the local spec troscopic properties of the adatom and its surrounding atoms and will certainly modify the arge and spin transport properties of the system

فرهاد فضيله

علي اكبر بابايي

جواد هاشمي فر، پيمان صاحب سرا