Special Group seminar at MPQ and Zoom: Ancilla theory of the pseudogap, and of the cuprate phase diagram
Prof. Subir Sachdev, Harvard University, USA
Special Group Seminar at MPQ lecture hall and Zoom
Friday, November, 17 at 4:00pm (MEZ)
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, and present 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.