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arXiv 0909.0762cond-mat.supr-concond-mat.str-el
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Bi_{2} Sr_{2} O_{8+δ}中准粒子干涉的动量相关观点

A momentum-dependent perspective on quasiparticle interference in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}

I. M. Vishik, B. Moritz, E. A. Nowadnick, W. S. Lee, K. Tanaka, T. Sasagawa, T. Fujii, T. P. Devereaux, Z. X. Shen

摘要:

角分辨光电子能谱(ARPES)探测材料的动量-空间电子结构,为高温超导铜氧化物的研究提供了宝贵的信息。同样,铜酸盐的实空间,不均匀的电子结构是由扫描隧道光谱(STS)阐明。最近,STS已经利用准粒子干涉(QPI)-类波电子散射杂质产生周期性的干涉图案-来推断动量空间中的QP的性质。令人惊讶的是,在Bi_{2} Sr_{2} CaCu_{2} O_{8+δ}(Bi-2212)中的一些干扰峰在反铁磁(AF)区边界之外不存在,这意味着特定散射过程的主导地位。在这里,我们表明,ARPES没有看到准粒子(QP)消光的证据:在费米表面上的任何地方都可以测量到类似QP的峰,在AF区边界上平滑地演化。这种明显的矛盾源于这些探测器的单粒子(ARPES)和双粒子(STS)过程的不同性质。使用一个简单的模型,我们证明了QPI的消光,而不意味着超过AF区边界的QP的损失。

英文摘要:

Angle Resolved Photoemission Spectroscopy (ARPES) probes the momentum-space electronic structure of materials, and provides invaluable information about the high-temperature superconducting cuprates. Likewise, the cuprate real-space, inhomogeneous electronic structure is elucidated by Scanning Tunneling Spectroscopy (STS). Recently, STS has exploited quasiparticle interference (QPI) - wave-like electrons scattering off impurities to produce periodic interference patterns - to infer properties of the QP in momentum-space. Surprisingly, some interference peaks in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ} (Bi-2212) are absent beyond the antiferromagnetic (AF) zone boundary, implying the dominance of particular scattering process. Here, we show that ARPES sees no evidence of quasiparticle (QP) extinction: QP-like peaks are measured everywhere on the Fermi surface, evolving smoothly across the AF zone boundary. This apparent contradiction stems from different natures of single-particle (ARPES) and two-particle (STS) processes underlying these probes. Using a simple model, we demonstrate extinction of QPI without implying the loss of QP beyond the AF zone boundary.

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