Angle-Resolved Photoemission Spectroscopic Study of Cuprate Fermiology in Bilayer Bismuth Strontium Calcium Copper Oxide

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Twenty-nine years have passed since the discovery of high-transition-temperature (Tc) superconductivity, yet no microscopic theory has successfully explained this remarkable phenomenon. Unlike conventional superconductivity where an energy gap opens at the Fermi level as we cool below Tc, high-Tc superconductivity in cuprates is accompanied by a mysterious pseudogap regime, where an energy gap is observed even above Tc. Both the nature of pseudogap and its effect on such high Tc are poorly understood, so this thesis work aims to probe the pseudogap and its relationship with high-Tc superconductivity, using angle-resolved photoemission spectroscopy (ARPES). We focus on the part of the phase diagram for bilayer Bi-Sr-Ca-Cu-O (Bi2212) near a putative quantum critical point (QCP), where pseudogap is believed to emerge from superconductivity at T = 0 K. Results have verified the phase competition between pseudogap and superconductivity. Data also support a conjectured reentrant phase boundary under the superconducting dome. In addition, we discover a robust gap suppression near antinodal momenta at T << Tc, whose origin is not pseudogap; rather, the suppression is either an intrinsic signature of d-wave superconductivity or is related to a novel order near the QCP. Close to this critical doping, we also observe no ARPES signature of particle-hole symmetry breaking by the pseudogap. The above findings provide important new insights of superconductivity, pseudogap and possibly new ground-state orders near the QCP.


Type of resource text
Date created June 2015


Author Zong, Alfred
Primary advisor Shen, Zhi-Xun
Advisor Fisher, Ian R.
Degree granting institution Stanford University, Department of Physics


Subject ARPES
Subject high-Tc superconductivity
Subject cuprate Fermiology
Subject Bi2212
Subject energy gap
Subject d-wave superconductivity
Subject pseudogap
Subject quantum critical point
Subject antinodal gap suppression
Subject particle-hole symmetry
Subject crystal growth
Genre Thesis

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Zong, Alfred. (2015). Angle-Resolved Photoemission Spectroscopic Study of Cuprate Fermiology in Bilayer Bismuth Strontium Calcium Copper Oxide. Stanford Digital Repository. Available at:


Undergraduate Theses, Department of Physics

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