17 citations · 82 across the 10 of their papers we have counts for
10 papers
Entanglement entropy of the quantum Potts chain
Péter Lajkó, Ferenc Iglói
The entanglement entropy, , is an indicator of quantum correlations in the ground state of a many body quantum system. At a second-order quantum phase-transition point in…
Numerical study of the critical behavior of the Ashkin-Teller model at a line defect
Peter Lajko, Ferenc Igloi
We consider the Ashkin-Teller model on the square lattice, which is represented by two Ising models ( and ) having a four-spin coupling of strength, , between them. We int…
Renormalization-group investigation of the S=1 random antiferromagnetic Heisenberg Chain
Péter Lajkó
We introduce variants of the Ma-Dasgupta renormalization-group approach for random quantum spin chains, in which the energy-scale is reduced by decimation built on either perturbat…
Scaling properties at the interface between different critical subsystems: The Ashkin-Teller model
Peter Lajko, Loic Turban, Ferenc Igloi
We consider two critical semi-infinite subsystems with different critical exponents and couple them through their surfaces. The critical behavior at the interface, influenced by th…
Logarithmic delocalization of end spins in the S=3/2 antiferromagnetic Heisenberg chain
Gabor Fath, Ors Legeza, Peter Lajko +1
Using the DMRG method we calculate the surface spin correlation function, , in the spin antiferromagnetic Heisenberg chain. For comparison we a…
Percolation and Conduction in Restricted Geometries
P. Lajko, L. Turban
The finite-size scaling behaviour for percolation and conduction is studied in two-dimensional triangular-shaped random resistor networks at the percolation threshold. The numerica…