Phase diagram of the t-U-J1-J2 chain at half filling

E. Szirmai; F. Gebhard; J. S\'olyom; R.M. Noack; X. Huang

arxiv: 0804.4810 · v1 · pith:RIFGTQLLnew · submitted 2008-04-30 · ❄️ cond-mat.str-el

Phase diagram of the t-U-J1-J2 chain at half filling

X. Huang , E. Szirmai , F. Gebhard , J. S\'olyom , R.M. Noack This is my paper

classification ❄️ cond-mat.str-el

keywords phaseexchangechainhubbardspinvaluesadditionalbond-order-wave

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We investigate the half-filled Hubbard chain with additional nearest- and next-nearest-neighbor spin exchange, J1 and J2, using bosonization and the density-matrix renormalization group. For J2 = 0 we find a spin-density-wave phase for all positive values of the Hubbard interaction U and the Heisenberg exchange J1. A frustrating spin exchange J2 induces a bond-order-wave phase. For some values of J1, J2 and U, we observe a spin-gapped metallic Luther-Emery phase.

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Phase diagram of the t-U-J1-J2 chain at half filling

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