Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1997-09-19
Phys. Rev. B, vol 56, 11097 (1997)
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages with 7 figures inside them, proper format of authors' names used
Scientific paper
10.1103/PhysRevB.56.11097
The spin-1/2 quantum Ising chain in a transverse random magnetic field is studied by means of the density-matrix renormalization group. The system evolves from an ordered to a paramagnetic state as the amplitude of the random field is increased. The dependence of the magnetization on a uniform magnetic field in the z direction and the spontaneous magnetization as a function of the amplitude of the transverse random magnetic field are determined. The behavior of the spin-spin correlation function both above and at criticality is studied. The scaling laws for magnetization and correlation functions are tested against previous numerical and renormalization-group results.
Caprara Sergio
Juozapavicius A.
Rosengren Anders
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