Charge fluctuations in the slave fermion representation of the t - J model - evidence for phase separation from loop corrections
Rasul, J. W.; Bai, Yujoung
Rasul, J W; Bai, Yujong (1996). "Charge fluctuations in the slave fermion representation of the t - J model - evidence for phase separation from loop corrections ." Journal of Physics: Condensed Matter. 8(25): 4495-4507. <http://hdl.handle.net/2027.42/48875>
AbstractWe investigate the charge density correlation function in the slave fermion representation of the two-dimensional t - J model using the self-consistent perturbation approach developed for that model by Li et al (1992 Phys. Rev. B 45 5428), which to lowest order in (t, J) gives a diagrammatic equivalent to the usual mean field theory. At the lowest order the equal-time correlation function (interpreted as the holon density correlation function) shows similar features to the results of recent high-temperature series calculations. However the loop corrections, representing scattering of holes by the antiferromagnetic spin fluctuations, lead to a divergent compressibility at low temperatures for low hole dopings and small J/t, which we interpret as indicating a tendency towards phase separation at a temperature .
IOP Publishing Ltd
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