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 J(c)/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.
|Titolo:||Phase diagram of the 1-dimensional t--J mode|
|Autori:||M. OGATA; M. LUCHINI; SORELLA S; F. ASSAD|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Data di pubblicazione:||1991|
|Appare nelle tipologie:||1.1 Journal article|