Valence bond glass theory of electronic disorder and the pseudogap state of high-temperature cuprate superconductors.
We show that the low-energy fluctuations of the valence bond due to the superexchange are pinned by the electronic disorder from off-stoichiometric dopants, leading to a valence bond glass (VBG) pseudogap phase in underdoped high-T_{c} cuprates. The antinodal Fermi surface sections are gapped out, giving rise to a normal state Fermi arc whose length shrinks with underdoping. Below T_{c}, the superexchange interaction induces a d-wave superconducting gap that coexists with the VBG pseudogap. The evolution of the local and momentum-space spectroscopy with doping and temperature captures the salient properties of the pseudogap phenomena and the electronic disorder.
Niestemski
Liang Ren
LR
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Wang
Ziqiang
Z