GROUND STATE CORRELATIONS.

G. Do Dang, C. Longuemare

In Nanostructures

João da Providência

Gian Luca Giorgi, Thomas Busch

Genuine multipartite correlations in finite-size XY chains are studied as a function of the applied external magnetic field. We find that, for low temperatures, multipartite correlations are sensitive to the parity change in the Hamiltonian ground state, given that they exhibit a minimum every time that the ground state becomes degenerate. This implies that they can be used to detect the factorizing point, that is, the value of the external field such that, in the thermodynamical limit, the ground state becomes the tensor product of single-spin states.

U. Balucani, M. Howard Lee, V. Tognetti

Peter Millington