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We investigate the phase diagram of phase separation for the hole-doped twodimensional system of antiferromagnetically correlated electrons based on theU(1) slave-boson functional integral approach to the t-J model. We show thatthe phase separation occurs for all values of J/t, that is, whether $0 < J/t <1$ or $J/t \geq 1$ with J, the Heisenberg coupling constant and t, the hoppingstrength. This is consistent with other numerical studies of hole-doped twodimensional antiferromagnets. The phase separation in the physicallyinteresting J region, $0 < J/t \lesssim 0.4$ is examined by introducinghole-hole (holon-holon) repulsive interaction. We find from this study thatwith high repulsive interaction between holes the phase separation boundarytends to remain robust in this low $J$ region, while in the high J region, J/t> 0.4, the phase separation boundary tends to disappear.Comment: 4 pages, 2 figures, submitted to Phys. Rev.

physical review. b, condensed matter

Phase separation based on a U(1) slave-boson functional integral approach to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mo>−</mml:mo><mml:mi>J</mml:mi></mml:math>model

Phase separation based on a U(1) slave-boson functional integral approach to thet−Jmodel