題目："Photoemission Studies of the Evolution of Correlated Systems with Carrier Doping : Cuprates vs. Ruthenates"



講演者：Dr. Kyle Shen（University of British Columbia）



日時： 12/7(木) 11:15-12:15



場所： 理学部E002



要旨

High-resolution angle-resolved photoemission spectroscopy (ARPES) has played a leading role over the past decade in elucidating the nature of low-lying electronic states in correlated materials. In strongly correlated transition metal oxides, one of the most important tuning parameters in manipulating the hermodynamic properties is the number of doped carriers. Here, we present a detailed study of two different strongly correlated material families - the high-temperature superconductor Ca_2-xNa_xCuO₂Cl₂ and the ruthenate Sr_2-xLa_xRuO₄. We compare and contrast the doping evolution of the two different systems. In the cuprate, due to strong correlations and polaron formation, the quasiparticle residue Z approaches zero as one reaches the Mott insulating limit and Luttinger's theorem is violated. In the case of Sr_2-xLa_xRuO₄, we find demonstrate precise agreement with one-electron theory and a rigid band shift, and corresponding agreements with thermodynamic measurements.



担当： 井野明洋　（理学研究科）内線7471



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