@article{ISI:000464729600002,
 abstract = {We investigate the ionic Hubbard model (IHM) at half-filling in the
limit of strong correlations and large ionic potential. The low-energy
effective Hamiltonian in this limit, obtained by a similarity
transformation, is a modified t-J model with effective second-neighbor
hopping terms. We explore the possibilities of d-wave pairing and
extended s-wave pairing superconducting (SC) phases on a two-dimensional
square lattice at zero temperature within a Gutzwiller projected
renormalized mean-field theory. In the sector of solutions that forbid
spin-ordering, the system shows a finite nonzero d-wave as well as
extended s-wave pairing amplitude for Delta similar to U >> t. The width
of the superconducting phase in U - Delta regime shrinks with increase
in U and Delta, though the extended s-wave pairing phase is higher in
energy than the d-wave pairing superconducting phase. But in a
spin-resolved renormalized mean-field calculation, which allows for an
antiferromagnetic (AF) order along with the d-wave or extended s-wave
pairing, the SC phase is no longer viable and the system shows a direct
transition from an AF ordered phase to a paramagnetic band insulator.
Except for a thin sliver of a half-metallic AF phase close to the AF
transition point, most of the AF ordered phase is a Mott insulator. We
benchmarked the AF Mott insulator to band insulator transition within
the Gutzwiller projected renormalized mean-field theory against the
dynamical mean-field theory solved using continuous time quantum Monte
Carlo. Our work suggests that the ground-state phase diagram of the IHM
at half-filling in the limit of extreme correlations does not have any
SC phase. The SC phase seen in the paramagnetic sector is a metastable
phase, being higher in energy than the AF Mott insulator phase.},
 article-number = {155127},
 author = {Chattopadhyay, Anwesha and Bag, Soumen and Krishnamurthy, H. R. and
Garg, Arti},
 doi = {10.1103/PhysRevB.99.155127},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {APR 15},
 number = {15},
 times-cited = {1},
 title = {Phase diagram of the half-filled ionic Hubbard model in the limit of
strong correlations},
 unique-id = {ISI:000464729600002},
 volume = {99},
 year = {2019}
}