Possible Z2 phase and spin-charge separation in electron doped cuprate superconductors

Details Possible Z2 phase and spin-charge separation in electron doped cuprate superconductors Possible Z2 phase and spin-charge separation in electron doped cuprate superconductors

2003-02-27

arxiv.org/abs/cond-mat/0302565v2

Phys. Rev. B 68, 024501 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 2 figures, RevTeX4. Homepage http://dao.mit.edu/~wen/

Scientific paper

10.1103/PhysRevB.68.024501

The SU(2) slave-boson mean-field theory for the tt'J model is analyzed. The role of next-nearest-neighbor hopping t' on the phase-diagram is studied. We find a pseudogap phase in hole-doped materials (where t'<0). The pseudo-gap phase is a U(1) spin liquid (the staggered-flux phase) with a U(1) gauge interaction and no fractionalization. This agrees with experiments on hole doped samples. The same calculation also indicates that a positive t' favors a Z2 state with true spin-charge separation. The Z2 state that exists when t' > 0.5J can be a candidate for the pseudo-gap phase of electron-doped cuprates (if such a phase exists). The experimental situation in electron-doped materials is also addressed.

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