Anomalous dispersion in the autocorrelation of ARPES data of Bi$_2$Sr$_2$CaCu$_2$O$_{8+delta}$

Anomalous dispersion in the autocorrelation of ARPES data of Bi$_2$Sr$_2$CaCu$_2$O$_{8+delta}$
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Bi$_2$Sr$_2$CaCu$_2$O$_{8 delta}$ ARPES 数据自相关的异常离散

DOI:
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发表时间:
2007
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影响因子:
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通讯作者:
Paul Scherrer Inst.
Paul Scherrer Inst.
中科院分区:
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文献类型:
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作者:
U. Chatterjee;M. Shi;A. Kaminski;A. Kanigel;H. Fretwell;Kensei Terashima;T. Takahashi;S. Rosenkranz;Z. Li;H. Raffy;A. Santander;K. Kadowaki;M. Randeria;M. Norman;J. Campuzano;Paul Scherrer Inst.

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我们发现,在角分辨光电子能谱数据的自相关的峰值Bi 2Sr2CaCu2O 8+ δ在超导状态下的结合能小于最大超导能隙的色散行为。然而,对于更高的能量,观察到一个惊人的异常色散,这是电子与集体激发相互作用的结果。相比之下,在赝能隙阶段,我们只观察到自相关峰的无色散行为。我们的研究结果的影响方面的傅立叶变换扫描隧道光谱数据进行了讨论。
We find that peaks in the autocorrelation of angle resolved photoemission spectroscopy data of Bi$_2$Sr$_2$CaCu$_2$O$_{8+delta}$ in the superconducting state show dispersive behavior for binding energies smaller than the maximum superconducting energy gap. For higher energies, though, a striking anomalous dispersion is observed that is a consequence of the interaction of the electrons with collective excitations. In contrast, in the pseudogap phase, we only observe dispersionless behavior for the autocorrelation peaks. The implications of our findings in regards to Fourier transformed scanning tunneling spectroscopy data are discussed.