Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1815076 | Physica B: Condensed Matter | 2009 | 5 Pages |
Abstract
By analyzing parameter-dependence of the linear entropy and the negativity of a block of L/2 odd-number spins, we study quantum phase transitions (QPTs) in the spin-1/2 Heisenberg XXZ model, the dimerized Heisenberg model, the dimerized-frustrated Heisenberg model and the spin-1 quadratic–biquadratic Heisenberg model. The numerical results reveal that most of the QPTs can be detected exactly by discontinuities, singularities or extreme points of these two quantities with finite-size samples. This fact implies that the linear entropy and the negativity can serve as efficient indicators of QPTs occurring in a variety of condensed-matter systems.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ming-Liang Hu, Xiao-Qiang Xi,