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Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO3

Citace:
PLUMB, N., SALLUZZO, M., RAZZOLI, E., MANSSON, M., FALUB, M., KREMPARSKY, J., MATT, C., CHANG, J., SCHULTE, M., BRAUN, J., EBERT, H., MINÁR, J., DELLEY, B., ZHOU, K., CHMITT, T., SHI, M., MESOT, J., PATTHEY, L., RADOVIĆ, M. Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO3. Physical ReviewLetters, 2014, roč. 113, č. 8, s. \´086801-1\´-\´086801-5\´. ISSN: 0031-9007
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO3
Rok vydání: 2014
Autoři: N.C. Plumb , M. Salluzzo , E. Razzoli , M. Mansson , M. Falub , J. Kremparsky , C.E. Matt , J. Chang , M. Schulte , J. Braun , H. Ebert , doc.Dr. Jan Minár , B. Delley , K.J. Zhou , T. Chmitt , M. Shi , J. Mesot , L. Patthey , M. Radović
Abstrakt CZ: Použitím fotoemisni spektroskopie ukážeme, že nedávno objevený povrchový stav na SrTiO3 se skládá z nondegenerovaných t2g stavů s různými 3D a 2D znaky. Zatímco DXY stavy mají kvazi - 2D disperze se slabou kz závislostí , dxz = dyz stavy ukazují, 3D disperzi . Ozařováním SrTiO3 v ultra vakuum je jedním ze způsobů jak je možné univerzálně vytvořit tenhle povrchový stav.
Abstrakt EN: Using angle-resolved photoemission spectroscopy, we show that the recently discovered surface state on SrTiO3 consists of nondegenerate t2g states with different dimensional characters. While the dxy bands have quasi-2D dispersions with weak kz dependence, the lifted dxz =dyz bands show 3D dispersions that differ significantly from bulk expectations and signal that electrons associated with those orbitals permeate the near-surface region. Like their more 2D counterparts, the size and character of the dxz =dyz Fermi surface components are essentially the same for different sample preparations. Irradiating SrTiO3 in ultrahigh vacuum is one method observed so far to induce the ?universal? surface metallic state. We reveal that during this process, changes in the oxygen valence band spectral weight that coincide with the emergence of surface conductivity are disproportionate to any change in the total intensity of the O 1s core level spectrum. This signifies that the formation of the metallic surface goes beyond a straightforward chemical doping scenario and occurs in conjunction with profound changes in the initial states and/or spatial distribution of near-EF electrons in the surface region
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