Temperature-dependent Fermi surface of 2H-TaSe2 driven by competing density wave order fluctuations

被引：25

作者：

Inosov, D. S. ^{[1
,2
]}

Evtushinsky, D. V. ^{[1
]}

Zabolotnyy, V. B. ^{[1
]}

Kordyuk, A. A. ^{[1
,3
]}

Buechner, B. ^{[1
]}

Follath, R. ^{[4
]}

Berger, H. ^{[5
]}

Borisenko, S. V. ^{[1
]}

机构：

[1] IFW Dresden, Inst Solid State Res, D-01171 Dresden, Germany

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[3] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[4] BESSY, D-12489 Berlin, Germany

[5] Ecole Polytech Fed Lausanne, Inst Phys Mat Complexe, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 12期

基金：

瑞士国家科学基金会;

关键词：

charge density waves; commensurate-incommensurate transformations; electronic structure; Fermi surface; photoelectron spectra; tantalum compounds; tight-binding calculations; RESOLUTION PHOTOEMISSION-SPECTROSCOPY; CHARGE-DENSITY; QUASI-CRYSTALS; ELECTRONIC-STRUCTURE; NEUTRON-SCATTERING; PEIERLS TRANSITION; SUPERCONDUCTORS; ENERGY; PSEUDOGAP; INSULATOR;

D O I：

10.1103/PhysRevB.79.125112

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature evolution of the 2H-TaSe2 Fermi surface (FS) is studied by high-resolution angle-resolved photoemission spectroscopy. High-accuracy determination of the FS geometry was possible after measuring electron momenta and velocities along all high-symmetry directions as a function of temperature with subsequent fitting to a tight-binding model. The estimated incommensurability parameter of the nesting vector agrees with that of the incommensurate charge modulations. We observe detectable nonmonotonic temperature dependence of the FS shape, which we show to be consistent with the analogous behavior of the pseudogap. These changes in the electronic structure could stem from the competition of commensurate and incommensurate charge density wave order fluctuations and could explain the puzzling reopening of the pseudogap observed in the normal state of the transition metal dichalcogenides.

引用

页数：5

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