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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Phase competition in trisected superconducting dome.

I M Vishik¹, M Hashimoto, Rui-Hua He

¹Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.

Proceedings of the National Academy of Sciences of the United States of America

|October 25, 2012

Summary

This study reveals two quantum critical points in cuprate superconductors using angle-resolved photoemission spectroscopy (ARPES). The findings revise the phase diagram, showing competition between superconducting and pseudogap phases.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Materials

Background:

Understanding complex materials like cuprate high-temperature superconductors requires detailed study of low-energy excitations.
Angle-resolved photoemission spectroscopy (ARPES) is vital for probing anisotropic gap structures in momentum space, characteristic of emergent phases like superconductivity and the pseudogap.

Purpose of the Study:

To conduct a comprehensive doping- and temperature-dependence ARPES study of spectral gaps in Bi(2)Sr(2)CaCu(2)O(8+δ).
To investigate the phase diagram of cuprate superconductors, focusing on the interplay between superconductivity and the pseudogap.

Main Methods:

Utilizing angle-resolved photoemission spectroscopy (ARPES) to analyze spectral gaps.
Performing comprehensive studies across various doping levels and temperatures for Bi(2)Sr(2)CaCu(2)O(8+δ).

Main Results:

Spectroscopic evidence for two quantum critical points at p = 0.19 (pseudogap phase) and p = 0.076 (competing phase) in the ground state.
Demonstrated that the pseudogap persists at higher temperatures (p > 0.19) and is not static below the critical temperature (T(c)).

Conclusions:

The study implies a revised phase diagram for cuprate superconductors.
Reconciles conflicting literature data on the pseudogap endpoint and highlights phase competition and distinct physics at the edge of the superconducting dome.