Primary role of the barely occupied states in the charge density wave formation of NbSe2.

Primary role of the barely occupied states in the charge density wave formation of NbSe2.
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NbSe2 电荷密度波形成中几乎不占据的状态的主要作用。

DOI:
10.1103/physrevlett.101.226406
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发表时间:
2008
影响因子:
8.6
通讯作者:
D. Feng
D. Feng
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
D. Shen;Yan Zhang;Lexian Yang;J. Wei;H. Ou;J. Dong;B. Xie;C. He;J. Zhao;Bo Zhou;M. Arita;K. Shimada;H. Namatame;M. Taniguchi;J. Shi;D. Feng

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NbSe 2是一种典型的电荷密度波(CDW)材料,其机理至今仍是个谜。利用角分辨光电子能谱,我们在布里渊区的一个大的破蜂窝区域内恢复了丢失已久的嵌套条件,该区域由六个鞍带点区域和远离费米面的大区域组成,鞍带点区域具有高的态密度(DOS),而在费米能区的DOS可以忽略不计。我们发现,CDW形成的主要贡献来自这些几乎没有占领的状态,而不是鞍带点。我们的研究结果不仅解决了一个长期存在的难题,而且推翻了传统的智慧,CDW是由高DOS的地区占主导地位。
NbSe2 is a prototypical charge-density-wave (CDW) material, whose mechanism remains mysterious so far. With angle resolved photoemission spectroscopy, we recovered the long-lost nesting condition over a large broken-honeycomb region in the Brillouin zone, which consists of six saddle band point regions with high density of states (DOS), and large regions away from Fermi surfaces with negligible DOS at the Fermi energy. We show that the major contributions to the CDW formation come from these barely occupied states rather than the saddle band points. Our findings not only resolve a long-standing puzzle, but also overthrow the conventional wisdom that CDW is dominated by regions with high DOS.
自旋涨落材料的电动力学
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
V. Stankevich;S. Kimura;他8名;T. Ito;S. Kimura
通讯作者: S. Kimura