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arXiv 1409.7008cond-mat.str-el
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轻掺杂Sr $_3$ Ir $_2$ O $_7$中具有小费米面的弱关联费米液态

A weakly correlated Fermi liquid state with a small Fermi surface in lightly doped Sr$_3$Ir$_2$O$_7$

Alberto de la Torre, Emily Claire Hunter, Alaska Subedi, Siobhan McKeown Walker, Anna Tamai, Timur Kim, Moritz Hoesch, Robin Perry, Antoine Georges, Felix Baumberger

摘要:

利用角分辨光电子能谱研究了(Sr $_{1-x}$ La $_x$)$_3$ Ir $_2$ O $_7$的电子掺杂演化.伴随着周围的金属绝缘体转变$x\approx0.05$,我们发现出现的相干准粒子态形成一个封闭的小费米面的体积$3x/2$,其中$x$是独立测量的La浓度。准粒子的重量$Z$保持大沿整个费米面,符合温和的重整化的低能量色散。这表明在轻掺杂的Sr $_3$ Ir $_2$ O_7 &中具有动量无关残留物$Z\approx0.5$的常规弱关联费米液态。

英文摘要:

We characterize the electron doping evolution of (Sr$_{1-x}$La$_x$)$_3$Ir$_2$O$_7$ by means of angle-resolved photoemission. Concomitant with the metal insulator transition around $x\approx0.05$ we find the emergence of coherent quasiparticle states forming a closed small Fermi surface of volume $3x/2$, where $x$ is the independently measured La concentration. The quasiparticle weight $Z$ remains large along the entire Fermi surface, consistent with the moderate renormalization of the low-energy dispersion. This indicates a conventional, weakly correlated Fermi liquid state with a momentum independent residue $Z\approx0.5$ in lightly doped Sr$_3$Ir$_2$O$_7&.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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