Angle-resolved photoemission spectroscopy of the insulating NaxWO3: Anderson localization, polaron formation, and remnant Fermi surface.
Angle-resolved photoemission spectroscopy of the insulating NaxWO3: Anderson localization, polaron formation, and remnant Fermi surface.
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DOI：
10.1103/physrevlett.96.147603
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发表时间：
2006-04
影响因子：
8.6
通讯作者：
S. Raj;D. Hashimoto;H. Matsui;S. Souma;T. Sato;T. Takahashi;D. Sarma;P. Mahadevan;S. Oishi-S.-Ois
中科院分区：
文献类型：
--
作者：
S. Raj;D. Hashimoto;H. Matsui;S. Souma;T. Sato;T. Takahashi;D. Sarma;P. Mahadevan;S. Oishi-S.-Ois
通过高分辨率角分辨光电子能谱研究了绝缘钠钨青铜 Na(0.025)WO(3) 的电子结构。我们发现，由于Na+离子在WO(3)晶格中随机分布而产生的强无序性，导致近E(F)态局域化，这使得系统绝缘。光发射光谱的温度依赖性为极化子的形成提供了直接证据。发现绝缘体的残余费米面是金属系统中真实费米面的复制品。
The electronic structure of the insulating sodium tungsten bronze, Na(0.025)WO(3), is investigated by high-resolution angle-resolved photoemission spectroscopy. We find that near-E(F) states are localized due to the strong disorder arising from random distribution of Na+ ions in the WO(3) lattice, which makes the system insulating. The temperature dependence of photoemission spectra provides direct evidence for polaron formation. The remnant Fermi surface of the insulator is found to be the replica of the real Fermi surface in the metallic system.