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4 papers · 2 filters
The Random Transverse Ising Spin Chain and Random Walks
F. Igloi, H. Rieger
We study the critical and off-critical (Griffiths-McCoy) regions of the random transverse-field Ising spin chain by analytical and numerical methods and by phenomenological scaling…
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…
Random and aperiodic quantum spin chains: A comparative study
F. Igloi, D. Karevski, H. Rieger
According to the Harris-Luck criterion the relevance of a fluctuating interaction at the critical point is connected to the value of the fluctuation exponent omega. Here we conside…
Quantum Critical Dynamics of the Random Transverse Field Ising Spin Chain
H. Rieger, F. Igloi
Dynamical correlations of the spin and the energy density are investigated in the critical region of the random transverse-field Ising chain by numerically exact calculations in la…