D-wave superconductivity in boson+fermion dimer models

Authors
Goldstein, G 
Chamon, C 
Castelnovo, Claudio  ORCID logo  https://orcid.org/0000-0003-1752-6343

Change log
Abstract

We present a slave-particle mean-field study of the mixed boson+fermion quantum dimer model introduced by Punk, Allais, and Sachdev [PNAS 112, 9552(2015)] to describe the physics of the pseudogap phase in cuprate superconductors. Our analysis naturally leads to four charge e fermion pockets whose total area is equal to the hole doping p, for a range of parameters consistent with the t-J model for high temperature superconductivity. Here we find that the dimers are unstable to d-wave superconductivity at low temperatures. The region of the phase diagram with d-wave rather than s-wave superconductivity matches well with the appearance of the four fermion pockets. In the superconducting regime, the dispersion contains eight Dirac cones along the diagonals of the Brillouin zone.

Publication Date
2017-05-01
Online Publication Date
2017-05-18
Acceptance Date
2017-04-03
Keywords
cond-mat.str-el, cond-mat.str-el
Journal Title
Physical Review B - Condensed Matter and Materials Physics
Journal ISSN
2469-9950
2469-9969
Volume Title
95
Publisher
American Physical Society
Sponsorship
Engineering and Physical Sciences Research Council (EP/M007065/1)