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arXiv 1408.4432cond-mat.str-el
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2 NbSe $_{2}$中的准粒子干涉、准粒子相互作用和电荷密度波的起源

Quasiparticle Interference, quasiparticle interactions and the origin of the charge density-wave in 2H-NbSe$_{2}$

C. J. Arguello, E. P. Rosenthal, E. F. Andrade, W. Jin, P. C. Yeh, N. Zaki, S. Jia, R. J. Cava, R. M. Fernandes, A. J. Millis, T. Valla, R. M. Osgood, A. N. Pasupathy

摘要:

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。我们从准粒子干涉的动量和能量依赖性表明,费米面嵌套是无关紧要的电荷密度波的形成在2 H-NbSe $_{2}$。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能带结构从角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的电子散射过程,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表明,重要的近费米面电子物理是由准粒子在不同于CDW有序波矢的波矢上耦合到软模声子所主导的。

英文摘要:

We show that a small number of intentionally introduced defects can be used as a spectroscopic tool to amplify quasiparticle interference in 2H-NbSe$_{2}$, 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-NbSe$_{2}$. 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 wavevector and energy dependence of the important electronic scattering processes thereby obtaining direct information both about the fermiology and the interactions. In 2H-NbSe$_{2}$, we use this combination to show 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 CDW ordering wave vector.

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