Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-11-20
Phys. Rev. A 79, 042317 (2009)
Physics
Condensed Matter
Statistical Mechanics
6+ pages, 5 figures
Scientific paper
10.1103/PhysRevA.79.042317
We study the entanglement content of a class of mesoscopic tunable magnetic systems. The systems are closed finite spin-1/2 chains with ferromagnetic nearest-neighbor interactions frustrated by antiferromagnetic next-nearest-neighbor interactions. The finite chains display a series of level crossings reflecting the incommensurate physics of the corresponding infinite-size chain. We present dramatic entanglement signatures characterizing these unusual level crossings. We focus on multi-spin and global measures of entanglement rather than only one-spin or two-spin entanglements. We compare and contrast the information obtained from these measures to that obtained from traditional condensed matter measures such as correlation functions.
Bandyopadhyay Jayendra N.
Chandra Ravi V.
Haque Masudul
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