Modeling the pseudogap metallic state in cuprates: quantum disordered pair density wave
Author(s)Dai, Zhehao; Senthil, T.; Lee, Patrick A.
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We present a way to quantum-disorder a pair density wave and propose it to be a candidate of the effective low-energy description of the pseudogap metal which may reveal itself in a sufficiently high magnetic field that suppresses the d-wave pairing. The ground state we construct is a small-pocket Fermi liquid with a bosonic Mott insulator in the density-wave-enlarged unit cell. At low energy, the charge density is mainly carried by charge 2e bosons, which develop a small insulating gap. As an intermediate step, we discuss the quantum disordering of a fully gapped superconductor and its excitation spectrum. A simplified 1D model, which we solve numerically, is used to illustrate the introduced concepts. We discuss a number of experimental consequences. The interplay between the electron and the small-gap boson results in a step-function background in the electron spectral function which may be consistent with existing angle-resolved photoemission spectroscopy data. Optical excitation across the boson gap can explain the onset and the magnitude of the mid infrared absorption reported long ago.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
Dai, Zhehao, T. Senthil, and Patrick A. Lee, "Modeling the pseudogap metallic state in cuprates: quantum disordered pair density wave." Physical Review B 101 (Feb. 2020): no. 064502 doi 10.1103/PhysRevB.101.064502 ©2020 Author(s)
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