Cuprate quantum phase transition probed by nanoscale density wave inhomogeneity

ORAL

Abstract

The cuprate phase diagram exhibits a number of ordered phases in addition to superconductivity, and it has long been postulated that a quantum critical point - separating the notoriously unconventional underdoped regime from the overdoped so-called Fermi liquid - may influence a large region of the phase diagram. Experiments to uncover the electronic correlations giving rise to the complex phenomenology are key to understanding the complete ground state evolution.

Here, we use the d-form factor density wave (DW), imaged via scanning tunneling microscopy, to probe the ground state evolution in superconducting (Pb,Bi)2(Sr,La)2CuO6+δ (Bi-2201). We employ the disorder caused by local dopant inhomogeneity to gain continuous access to the doping axis of the phase diagram, both via standard Fourier techniques and machine learning. We find a transition in the DW from commensurate to incommensurate, which occurs simultaneously with the Fermi surface transition, where open arcs are replaced by a conventional large Fermi surface. The coincidence of these transitions indicates an intimate link between the commensurate instability and the mechanism underlying the Fermi arcs.

–

Presenters

  • Tatiana Webb

    Physics, Harvard University, Department of Physics, Harvard University, Harvard University

Authors

  • Tatiana Webb

    Physics, Harvard University, Department of Physics, Harvard University, Harvard University

  • Kaylie Hausknecht

    Department of Physics, Harvard University

  • Michael C Boyer

    Department of Physics, Clark University, Clark University, Physics, Clark University

  • Yi Yin

    Department of Physics, Zhejiang University, Zhejiang University

  • Debanjan Chowdhury

    Physics, MIT, Department of Physics, Massachusetts Institute of Technology, Massachusetts Institute of Technology

  • Yang He

    Department of Physics, Harvard University, Harvard University

  • Takeshi Kondo

    ISSP, University of Tokyo, Institute for Solid State Physics, University of Tokyo, University of Tokyo

  • Tsunehiro Takeuchi

    Toyota Technological Institute, Nagoya University

  • Hiroshi Ikuta

    Department of Materials Physics, Nagoya University, Nagoya University

  • Eric Hudson

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Mohammad H Hamidian

    Department of Physics, Harvard University, Harvard University, Department of Physics, Harvard University, Cambridge, MA, United States

  • Jennifer Hoffman

    Physics, Harvard University, Department of Physics, Harvard University, Harvard University, Department of Physics, Harvard University, Cambridge, MA, United States