The phase diagram of the one-dimensional t-J model is investigated by analyzing the results of exact diagonalization and the exact solutions at J/t=0 and 2. Phase separation takes place above a critical value of J around Jc/t=2.5 3.5 depending on the electron density. In the small-J region, Tomonaga-Luttinger liquid theory holds and its correlation exponents are calculated as a function of J/t and the electron density. Superconducting correlations become dominant in a region between the solvable case (J/t=2) and phase separation. A spin-gap region is also found at low density. © 1991 The American Physical Society.
Phase diagram of the 1-dimensional t--J mode / Ogata, M.; Luchini, M. U.; Sorella, S.; Assaad, F. F.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 66:(1991), pp. 2388-2391. [10.1103/PhysRevLett.66.2388]
Phase diagram of the 1-dimensional t--J mode
Sorella, S.;
1991-01-01
Abstract
The phase diagram of the one-dimensional t-J model is investigated by analyzing the results of exact diagonalization and the exact solutions at J/t=0 and 2. Phase separation takes place above a critical value of J around Jc/t=2.5 3.5 depending on the electron density. In the small-J region, Tomonaga-Luttinger liquid theory holds and its correlation exponents are calculated as a function of J/t and the electron density. Superconducting correlations become dominant in a region between the solvable case (J/t=2) and phase separation. A spin-gap region is also found at low density. © 1991 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
