Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-11-15
Phys. Rev. Lett. 106, 136402 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 1 figure, RevTex4, updated references
Scientific paper
10.1103/PhysRevLett.106.136402
Sr2IrO4 has been suggested as a Mott insulator from a single J_eff=1/2 band, similar to the cuprates. However this picture is complicated by the measured large magnetic anisotropy and ferromagnetism. Based on a careful mapping to the J_eff=1/2 (pseudospin-1/2) space, we propose that the low energy electronic structure of Sr2IrO4 can indeed be described by a SU(2) invariant pseudospin-1/2 Hubbard model very similar to that of the cuprates, but with a "twisted" coupling to external magnetic field (a g-tensor with a staggered antisymmetric component). This perspective naturally explains the magnetic properties of Sr2IrO4. We also derive several simple facts based on this mapping and the known results about the Hubbard model and the cuprates, which may be tested in future experiments on Sr2IrO4. In particular we propose that (electron-)doping Sr2IrO4 can potentially realize high-temperature superconductivity.
Senthil T.
Wang Faming
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