Entanglement in a first-order quantum phase transition

Entanglement in a first-order quantum phase transition

The phase diagram of spins 1/2 embedded in a magnetic field mutually interacting antiferromagnetically is determined. Contrary to the ferromagnetic case where a second order quantum phase transition occurs, a first order transition is obtained at zero field. The spectrum is computed for a large numb...

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Veröffentlicht in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2004-05, Vol.69 (5), Article 054101
Hauptverfasser: Vidal, Julien, Mosseri, Rémy, Dukelsky, Jorge
Format: Artikel
Sprache:eng
Schlagworte:
ATOMIC AND MOLECULAR PHYSICS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Condensed Matter
CORRELATIONS
GROUND STATES
MAGNETIC FIELDS
Other
PHASE TRANSFORMATIONS
Physics
QUANTUM MECHANICS
Quantum Physics
SPIN
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Beschreibung
Zusammenfassung:The phase diagram of spins 1/2 embedded in a magnetic field mutually interacting antiferromagnetically is determined. Contrary to the ferromagnetic case where a second order quantum phase transition occurs, a first order transition is obtained at zero field. The spectrum is computed for a large number of spins and allows one to study the ground state entanglement properties which displays a jump of its concurrence at the critical point.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.69.054101