Browsing by Author "Eder, R."

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    Systematic scaling in the low-energy excitations of the t-J model in one and two dimensions
    Eder, R.; Chen, Y. C.; Lin, H. Q.; Ohta, Y.; Shih, C. T.; Lee, T. K. (American Physical Society, 1997-05-01)
    We present an exact diagonalization study of the low-energy singlet and triplet states for both the one-dimensional (1D) and 2D t-J models. A scan of the parameter ratio J/t shows that for most low-energy states in both 1D and 2D the excitation energy takes the form E(t,J)=a . t+b . J. In 1D this is the natural conse quence of the factorization of the low-energy wave functions, i.e., spin-charge separation. Examination of the low-energy eigenstates in 2D shows that most of these are collective modes, which for larger J correspond to a periodic modulation of the hole density. The modulation is well reproduced by treating holes as hard-core bosons with an attractive interaction.