Condensed Matter Physics, 2007, vol. 10, No. 3(51), p. 425432, English
DOI:10.5488/CMP.10.3.425
Title:
Emptiness formation probability for the spin1/2 XX chain with three spin and uniform longrange interactions
Author(s):

P.Lou
(Depament of Chemistry, Sungkyunkwan University,Suwon 440746, Korea; Depament of Physics, Anhui University, Hefei 230039, Anhui, P.R. China)
,


J.Y.Lee
(Depament of Chemistry, Sungkyunkwan University,Suwon 440746, Korea)
,

The emptiness formation probability (EFP) that the first n
spins of the chain are all aligned downwards is studied for
the onedimensional spin1/2 XX chain system with
both critical and noncritical regimes with three spin and
uniform longrange interactions. By using the emptiness
formation probability P(n), the blockblock entanglement S_{n}
and the magnetization M ^{z}, the properties of the system are
also studied. It is worthy of note that when the quantum phase
transition from the phase III to the phase II occurs, the Emptiness
Formation Probability P(n) of the system decreases, but
the blockblock entanglement S_{n} increases.
Key words:
emptiness formation probability, spin1/2 XX
chain, three spin and uniform longrange interactions
PACS:
75.10.Jm, 75.40.Cx, 75.40.s, 73.43.Nq
