Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet
Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet
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DOI：
10.1126/science.1251151
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发表时间：
2014-07-11
期刊：
影响因子：
56.9
通讯作者：
Kim, B. J.
中科院分区：
文献类型：
--
作者：
Kim, Y. K.;Krupin, O.;Kim, B. J.
铜酸盐中的高温超导电性是由一种仍然鲜为人知的电子态引起的。我们报道了在一种非铜酸盐材料--Ir酸锶(Sr2IrO4)中观察到的一个相关的电子态，在这种电子态中，很大程度上复制了不同的铜酸盐发育学。当通过原位沉积碱金属原子进行表面电子掺杂时，Sr2IrO4的角度分辨光电子能谱显示出被称为费米弧的零能态的不连续段，以及高达80毫电子伏的间隙。随着掺杂和温度的变化，它向具有闭合费米表面的正常金属相的演化与铜酸盐中的演化过程平行。我们的结果表明，Sr2IrO4是一种与铜酸盐相比较的有用的模型体系。
High-temperature superconductivity in cuprates arises from an electronic state that remains poorly understood. We report the observation of a related electronic state in a noncuprate material, strontium iridate (Sr2IrO4), in which the distinct cuprate fermiology is largely reproduced. Upon surface electron doping through in situ deposition of alkali-metal atoms, angle-resolved photoemission spectra of Sr2IrO4 display disconnected segments of zero-energy states, known as Fermi arcs, and a gap as large as 80 millielectron volts. Its evolution toward a normal metal phase with a closed Fermi surface as a function of doping and temperature parallels that in the cuprates. Our result suggests that Sr2IrO4 is a useful model system for comparison to the cuprates.