Stripe orders driven by long-range Coulomb forces in the 2D-Hubbard model

R. Citro and M. Marinaro
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R. Citro: Dipartimento di Fisica ”E.R. Caianiello”, University of Salerno and Unità INFM of Salerno, Baronissi (Sa), Italy
M. Marinaro: Dipartimento di Fisica ”E.R. Caianiello”, University of Salerno and Unità INFM of Salerno, Baronissi (Sa), Italy

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 3, 343-348

Abstract: 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.

Keywords: PACS. 71.10.Fd Lattice fermion models (Hubbard model, etc.) – 71.45.Lr Charge-density-wave systems – 71.27.+a Strongly correlated electron systems; heavy fermions (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/PL00011102

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