arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1109.0380cond-mat.str-el
收藏

电荷密度波诱导CeTe2中费米面重构的ARPES研究

Fermi Surface Reconstruction in CeTe2 Induced by Charge Density Wave: ARPES Study

J. -S. Kang, D. H. Kim, H. J. Lee, J. H. Hwang, Han-Koo Lee, H. -D. Kim, B. H. Min, K. E. Lee, Y. S. Kwon, J. W. Kim, Kyoo Kim, B. H. Kim, B. I. Min

摘要:

用角分辨光电子能谱(ARPES)研究了电荷密度波CDW体系CeTe_2-xSb_x(x=0,0.05)的电子结构.对于无畸变的CeTe_2,费米面(FS)的计算值与实测值在形状和尺寸上都符合得很好。在ARPES中观察到了穿过费米能级(E_F)的金属态。E_F附近的载流子主要具有Te(1)5 p特征,Ce 4f态对CDW形成的贡献很小。超原胞(阴影)带和相应的非常弱的FS的被发现产生的能带折叠由于与Ce-Te(2)层的相互作用。研究结果表明,CeTe_2中CDW的形成来源于FS嵌套,CDW调制矢量沿γ X方向(Q_CDW ~ X)

英文摘要:

Electronic structures of a charge-density-wave CDW system CeTe_2-xSb_x (x=0, 0.05) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES). The observed Fermi surface (FS) agrees very well with the calculated FS for the undistorted CeTe_2 both in shapes and sizes. The metallic states crossing the Fermi level(E_F) are observed in ARPES. The carriers near E_F have mainly the Te(1) 5p character, with the negligible contribution from Ce 4f states to the CDW formation. The supercell (shadow) bands and the corresponding very weak FS's are found to arise from band-folding due to the interaction with Ce-Te(2) layers. This work shows that the origin of the CDW formation in CeTe_2 is the FS nesting and that the CDW modulation vector is along Gamma-X (Q_CDW ~ X)

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。

↑