Tgp chi khoa hgc TrUJfng Dgi hgc Quy Nhan Sd 4, Tgp VI nSm 2012 NGHIEN ctfu PIN MAT TR^I MANG M 6 N G BANG PHlTOfNG PHAP MO HiNH H 6 A VA M 6 P H 6 N G sd NGUvfeN DLfC HigU", VO THI THANH TUY^N'''''''', TRA[.]
Tgp chi khoa hgc TrUJfng Dgi hgc Quy Nhan - Sd 4, Tgp VI nSm 2012 NGHIEN ctfu PIN MAT TR^I MANG M N G BANG PHlTOfNG PHAP MO HiNH H A VA M P H N G sd NGUvfeN DLfC HigU", VO THI THANH TUY^N'', TRAN THANH THAP GI, F,_, vi E , nghiem niy du d^ suy tat ci cic die trUhg khic dieu kien trang thii dilfng Phi^tfng trinh lien tiic Trong tnlflng hdp tdng quit, sir chuyen rSi cQa cic h?t tai didn bin dinbi chi phdi bdi hai qui trinh: qui trinh khu^ch tin dudi tic dung cia gradient ndng dd va qui trinh kdo theo bdi gradient didn thd' dien trirflng Cic qua trinh diioc bieu didn bdi cic phtfdng trinh hen tuc [1, 3, 6]: J,=1\i.n^+qD, (5) J,=q\i,l^-qD^^ (6) C* day: n„, p._, D_, D^ va ^lln lUdt li dO Unh ddng cic hat tii, hkng sd khudch tin cua cic hat tai vi tnrdng tinh dien Vdi svf xic dinh cia cic mile quasi-Fermi, E^ va E^, va cic dien thd' quasi-Fermi, *,, = - (E„/q) va %=