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| Paper IPM / Physic / 7926 |
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| Abstract: | |
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The opening of energy in the charge and spin degrees of freedom is reported on the ladder geometry. I)Our recent works on ferrimagnetic (S1,S2)two legs ladder is reviewed. We study the emergence of magnetization plateau by exact diagnolization using Lanczos method. We also explain the reason for different magnetization pateaux in the phase diagram of bond-alternation ladder. II)We study the charge density plateau in the two and three legs t−J ladder, where a charge gap can be opened as a function of the chemical potential in different regime of rung and leg couplings.
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