Joint SP seminar on Tues.

[Cond.Matt. & Stat.Mech.Section]

JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR



  Tuesday, 16 February   -   11:00 hrs.



  Lecture Room -  SISSA Main Building



Francesco RAVANINI     (Università di Bologna)



"Exact entanglement entropy of the   XYZ model and its sine-Gordon  
limit"



Abstract



We obtain the exact expression for the Von Neumann entropy for an  
infinite bipartition of the XYZ model, by connecting its reduced  
density matrix to the corner transfer matrix of the eight vertex  
model.  Then we consider the anisotropic scaling limit of the XYZ  
chain that yields the 1+1 dimensional sine-Gordon model. We present  
the formula for the entanglement entropy of the latter, which has the  
structure of a dominant logarithmic term plus a constant, in agreement  
with what is generally expected for a massive quantum field theory.