通过光电子能谱观察到的CeTe₃电荷密度波态中的费米面重构。

Fermi surface reconstruction in the CDW state of CeTe3 observed by photoemission.

作者信息

Brouet V, Yang W L, Zhou X J, Hussain Z, Ru N, Shin K Y, Fisher I R, Shen Z X

机构信息

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

出版信息

Phys Rev Lett. 2004 Sep 17;93(12):126405. doi: 10.1103/PhysRevLett.93.126405.

DOI:10.1103/PhysRevLett.93.126405

PMID:15447291

Abstract

CeTe3 is a layered compound where an incommensurate charge density wave (CDW) opens a large gap ( approximately 400 meV) in optimally nested regions of the Fermi surface (FS), whereas other sections with poorer nesting remain ungapped. Through angle-resolved photoemission, we identify bands backfolded according to the CDW periodicity. They define FS pockets formed by the intersection of the original FS and its CDW replica. Such pockets illustrate very directly the role of nesting in the CDW formation but they could not be detected so far in a CDW system. We address the reasons for the weak intensity of the folded bands, by comparing different foldings coexisting in CeTe3.

摘要

CeTe₃是一种层状化合物，其中非公度电荷密度波（CDW）在费米面（FS）的最佳嵌套区域打开一个大的能隙（约400毫电子伏特），而其他嵌套较差的部分则没有能隙。通过角分辨光电子能谱，我们识别出根据CDW周期性折叠的能带。它们定义了由原始FS及其CDW复制品相交形成的FS口袋。这些口袋非常直观地说明了嵌套在CDW形成中的作用，但到目前为止在CDW系统中尚未检测到。我们通过比较CeTe₃中共存的不同折叠来探讨折叠能带强度较弱的原因。