Emergence of robust gaps in two-dimensional antiferromagnets via additional spin-1/2 probes

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Aires Ferreira (Author) Other; Viana Lopes, JV (Author) FEUP; Lopes dos Santos, JMBL (Author) FCUP

Journal

Title: Physical Review A - Atomic, Molecular, and Optical Physics

Vol. 82

ISSN: 1050-2947

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 3 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-003-3YV

DOI: 10.1103/physreva.82.022320

Abstract (EN): We study the capacity of antiferromagnetic lattices of varying geometries to entangle two additional spin-1/2 probes. Analytical modeling of the quantum Monte Carlo data shows the appearance of a robust gap, allowing a description of entanglement in terms of probe-only states, even in cases where the coupling to the probes is larger than the gap of the spin lattice and cannot be treated perturbatively. We find a considerable enhancement of the temperature at which probe entanglement disappears as we vary the geometry of the bus and the coupling to the probes. In particular, the square Heisenberg antiferromagnet exhibits the best thermal robustness of all systems, whereas the three-leg ladder chain shows the best performance in the natural quantum ground state.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10