2003/02/28 by Tiago C. Ribeiro, Xiao-Gang Wen
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Cuprate #Doping #Organic and Molecular Conductors Research #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.68.024501
published as Phys. Rev. B 68, 024501 (2003) · 6 pages, 2 figures, RevTeX4. Homepage http://dao.mit.edu/~wen/
openalex publication_date 2003/07/01 · arxiv created 2003/08/21 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The SU(2) slave-boson mean-field theory for the tt^\ensuremath'J model is analyzed. The role of next-nearest-neighbor hopping t^\ensuremath' on the phase diagram is studied. We find a pseudogap phase in hole-doped (HD) materials (where t^\ensuremath'<0). The pseudogap 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 HD samples. The same calculation also indicates that a positive t^\ensuremath' favors a Z2 state with true spin-charge separation. The Z2 state that exists when t^\ensuremath'\ensuremath\gtrsim0.5J can be a candidate for the pseudogap phase of electron-doped (ED) cuprates (if such a phase exists). The experimental situation in ED materials is also addressed.