Two-Dimensional t-J Model at Low Electron Density

Details Two-Dimensional t-J Model at Low Electron Density Two-Dimensional t-J Model at Low Electron Density

1994-11-10

arxiv.org/abs/cond-mat/9411042v2

Physics

Condensed Matter

Revised version discusses p-wave and d-wave pairing at small finite densities for J/t < 2. 4 pages, two-column Revtex, uuencod

Scientific paper

10.1103/PhysRevB.52.4639

The phase diagram of the two-dimensional t-J model is determined accurately at low electron density by a combination of analytic and numerical techniques. The ground state exhibits three phases in the limit of zero electron density: an unpaired state at small J/t, a gas of s-wave pairs for 2 < J/t < 3.4367, and a phase separated state at larger interaction strengths. Bound states of larger clusters are never realized, and the instabilities present at small densities are discussed.

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