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아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다


아 래


제목: Electronic phase transition in low dimensional SrTiO3/(Sr1-x,Lax)TiO3 oxide superlattices


연사: 이  재  찬 교수님 (성균관대학교 신소재공학부 )


일시: 2011년 9월 21일(수) 오후 4:30


장소: e+첨단강의실 (31214호실)


초록:  We report low dimensional oxide structures made by La doping on SrTiO3, represented by SrTiO3/(Sr1-x,Lax)TiO3 superlattices. The low dimensional transition metal oxide structures provide electronic confinement through orbital reconstruction of d orbital of the transition metal ion and correspondingly exhibit metal to insulator transition with the thickness of SrTiO3 layers. This is contrast to the behavior of bulk SrTiO3 doped with La.  The carrier density of the low dimensional structures also had a non-linear relationship with the stacking period while the carrier density of bulk SrTiO3 had a linear relation with La doping content.  Through the orbital reconstruction, degenerate narrow 3d bands are lifted and dxy band is shifted lower than dxz, dyz bands, making dxz band the first available state upon the La doping.  Moreover, doped electrons occupying dxz  band are strongly localized next the doped layer.  As a result, the low dimensional oxide structure has two types of carriers, one localized at the interface (La doped layer) and the other extended into SrTiO3 layer, which exhibit quite different transport characteristics from bulk doped case.  Transport behavior of such a low dimensional structure can be tuned by varying dimensionality and the corresponding metal-insulator transition is induced.   

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