Special Seminar: “Ancilla theory of the pseudogap, and of the cuprate phase diagram” (Prof. Subir Sachdev)

  • Date: Nov 17, 2023
  • Time: 04:00 PM (Local Time Germany)
  • Speaker: Prof. Subir Sachdev
  • Harvard University
  • Location: Max Planck Institute of Quantum Optics
  • Room: Herbert Walther Lecture Hall
The pseudogap is mysterious metallic state of electrons which appears above the critical temperature of correlated electron superconductors, most prominently in the lightly-hole-doped cuprates. I argue that the pseudogap is best understood as the finite temperature realization of a metallic ground state with a spin liquid character, andpresent a theory using a bi-layer of ancilla qubits. This theory leads to a variational wavefunction for the pseudogap state, to gauge theories for transitions and crossovers out of the pseudogap, and to a unifying perspective on the cuprate phase diagram.
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