51 citations · 144 across the 8 of their papers we have counts for
8 papers
Quantum Potts chain in alternating field
Péter Lajkó. Wedade Alaaeldin Ahmed Shafik Yehia, Ferenc Iglói
The -state Potts chain with ferromagnetic couplings, , in the presence of a transverse field, , has a quantum phase transition at , which is continuous for $q \le…
Griffiths-McCoy singularities in random quantum spin chains: Exact results
Ferenc Iglói, István A. Kovács
We consider random quantum (tight-binding, XX and Ising) spin chains in the off-critical region and study their Griffiths-McCoy singularities. These are obtained from the density o…
Disorder induced cross-over effects at quantum critical points
Enrico Carlon, Péter Lajko, Ferenc Iglói
Critical properties of quantum spin chains with varying degrees of disorder are studied at zero temperature by analytical and extensive density matrix renormalization methods. Gene…
Griffiths-McCoy singularities in random quantum spin chains: Exact results through renormalization
Ferenc Igloi, Robert Juhasz, Peter Lajko
The Ma-Dasgupta-Hu renormalization group (RG) scheme is used to study singular quantities in the Griffiths phase of random quantum spin chains. For the random transverse-field Isin…
Correlation length-exponent relation for the two-dimensional random Ising model
Peter Lajko, Ferenc Igloi
We consider the two-dimensional (2d) random Ising model on a diagonal strip of the square lattice, where the bonds take two values, , with equal probability. Using an iter…
Boundary critical behaviour of two-dimensional random Ising models
F. Igloi, P. Lajko, W. Selke +1
Using Monte Carlo techniques and a star-triangle transformation, Ising models with random, 'strong' and 'weak', nearest-neighbour ferromagnetic couplings on a square lattice with a…
Surface critical behavior of two-dimensional dilute Ising models
W. Selke, F. Szalma, P. Lajko +1
Ising models with nearest-neighbor ferromagnetic random couplings on a square lattice with a (1,1) surface are studied, using Monte Carlo techniques and star-tiangle transformation…
Critical Behavior of Hierarchical Ising Models
Ferenc Igloi, Peter Lajko, Ferenc Szalma
We consider the critical behavior of two-dimensional layered Ising models where the exchange couplings between neighboring layers follow hierarchical sequences. The perturbation ca…