Quasiparticle Interference, Quasiparticle Interactions, and the Origin of the Charge Density Wave in 2H-NbSe2
Quasiparticle Interference, Quasiparticle Interactions, and the Origin of the Charge Density Wave in 2H-NbSe2
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DOI：
10.1103/physrevlett.114.037001
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发表时间：
2015-01-21
影响因子：
8.6
通讯作者：
Pasupathy, A. N.
中科院分区：
文献类型：
--
作者：
Arguello, C. J.;Rosenthal, E. P.;Pasupathy, A. N.
我们表明，少量的故意引入的缺陷可以用作光谱工具，以放大准粒子干涉在2 H-NbSe 2，我们测量扫描隧道光谱成像。从准粒子干涉的动量和能量依赖性，我们发现费米面嵌套对2 H-NbSe 2中电荷密度波的形成是无关紧要的。我们表明，通过结合准粒子干涉数据与额外的知识的准粒子带结构的角度分辨光电子能谱测量，可以提取的波矢量和能量依赖的重要电子散射过程，从而获得直接的信息都有关的费米和相互作用。在2 H-NbSe 2中，我们使用这种组合来确认重要的近费米面电子物理是由准粒子在不同于电荷密度波序波矢的波矢上与软模声子的耦合所主导的。
We show that a small number of intentionally introduced defects can be used as a spectroscopic tool to amplify quasiparticle interference in 2H-NbSe2 that we measure by scanning tunneling spectroscopic imaging. We show, from the momentum and energy dependence of the quasiparticle interference, that Fermi surface nesting is inconsequential to charge density wave formation in 2H-NbSe2. We demonstrate that, by combining quasiparticle interference data with additional knowledge of the quasiparticle band structure from angle resolved photoemission measurements, one can extract the wave vector and energy dependence of the important electronic scattering processes thereby obtaining direct information both about the fermiology and the interactions. In 2H-NbSe2, we use this combination to confirm that the important near-Fermi-surface electronic physics is dominated by the coupling of the quasiparticles to soft mode phonons at a wave vector different from the charge density wave ordering wave vector.