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  1. Momentum-space electronic structures and charge orders of the high-temperature superconductors Ca2-xNaxCuO₂Cl₂ and Bi₂Sr₂CaCu₂O8+δ

    We study the electronic structure of Ca2-xNaxCuO₂Cl₂ and Bi₂Sr₂CaCu₂O8+δ samples in a wide range of doping, using angle-resolved photoemission spectroscopy, with emphasis on the Fermi surface (FS) in the near antinodal region. The “nesting wave vector,” i.e., the wave vector that connects two nearly flat pieces of the FS in the antinodal region, reveals a universal monotonic decrease in magnitude as a function of doping. Comparing our results to the charge order recently observed by scanning tunneling spectroscopy (STS), we conclude that the FS nesting and the charge order pattern seen in STS do not have a direct relationship. Therefore,more » the charge order likely arises due to strong-correlation physics rather than FS nesting physics« less
  2. ARPES study of X-point band overlaps in LaB6 and SmB6 — contrast to SrB6 and EuB6

    Here, angle resolved photoemission spectroscopy (ARPES) was used to study the complete absence of an X-point band gap for trivalent LaB6 and a partial absence of the band gap for mixed valent SmB6. A X-point band gap was found in divalent hexaborides. The two results indicate a nontrivial evolution of the band structure from divalent to trivalent hexaborides.
  3. Extremely Correlated Fermi-Liquid Description of Normal-State ARPES in Cuprates


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"Gweon, G. -H."

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