| Issue |
Europhys. Lett.
Volume 52, Number 1, October I 2000
|
|
|---|---|---|
| Page(s) | 87 - 93 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00408-4 | |
| Published online | 01 September 2002 | |
Supersymmetric mean-field theory of the t-J model
Department of Physics, Hong Kong University of Science and
Technology Clear Water Bay, Hong Kong, PRC
Received:
26
May
2000
Accepted:
30
July
2000
The supersymmetric formulation of the t-J model is studied
in this paper at the mean-field level
where the δ-T phase diagram is determined.
We found that the slave-fermion–like spiral phase
is stable at low doping concentration, and the slave-boson–like
d-wave fermionic spin pairing state becomes energetically favourable
when 
. An improvement in free energy using
Gutzwiller's method lowers the transition doping concentration
to 
.
We also point out the existence of new branches of excitations
in the supersymmetric theory.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.25.Dw – Superconductivity phase diagrams
© EDP Sciences, 2000
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