Abstract:
Within the single band 2D-Hubbard model treated by means of a strong-coupling approach based on a cumulant expansion and a nonstandard diagrammatic technique, we discuss the existence of critical charge fluctuations that could give rise to an instability towards a phase separation (PS). It turns out that such instability exists and evolves into an incommensurate charge density wave (ICDW) when long-range Coulomb forces are taken into account. We find a stripe phase with a crossover from diagonal to vertical stripes at increasing doping in the range 0.01 ?δ? 0.2 and increasing Coulomb potential U, similarly to recent NMR experiments on La 2 - x Sr x CuO 4.
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Received 20 November 2000
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Citro, R., Marinaro, M. Stripe orders driven by long-range Coulomb forces in the 2D-Hubbard model. Eur. Phys. J. B 20, 343–348 (2001). https://doi.org/10.1007/PL00011102
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DOI: https://doi.org/10.1007/PL00011102