5316

4986

كارشناسي ارشد

فيزيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1388

[هشت]،92ص: مصور، جدول، نمودار

ص.ع.به فارسي و انگليسي

بهروز ميرزا، فرهاد فضيله

احمد شيرزاد

13/4/89

1397/08/01

كتابنامه

فيزيك

ID4986

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Numerical study of the effect of disorder and electron electron intractions on the density of states of the Graphene Nanoribbons Abstract In recent years electrical and magnetic properties of Graphene Nanoribbons have attracted much attention We were motivated to this study by observing the effect of disorder on the electronic transport in nano structures In this thesis we first formed the tight binding Hamiltonian of the system in real space and then we added Anderson disorder or quantum percolation in the model Hamiltonian Then the eigenstates of the Hamiltonian have been calculated To investigate the electrical transport properties of nanoribbons in the persence of disorder we characterized localization of electron eigenstates by using inverse participation ratio IPR In fact the strength of localization of Hamiltonian eigenstates are suitable parameters to review the transport in the system Real Nanoribbons are isolated and surrounded by vacuum so the effect of screened Coulomb interaction is weak That s why in the last part of this thesis effect of electron electron interactions on the density of states of the Nanoribbons was examined We treated the interactions in an approximate way using self consistent real space Hartree Fock equations Our calculation indicates the existance of a mobility edge in strongly disordered Graphene Nanoribbons which is in agreement with exprimental results Key Words Graphene Nanoribbons Anderson disorder quantum percolation IPR Hartree Fock

بهروز ميرزا، فرهاد فضيله

احمد شيرزاد