7 papers
Critical Behavior and Griffiths-McCoy Singularities in the Two-Dimensional Random Quantum Ising Ferromagnet
C. Pich, A. P. Young, H. Rieger +1
We study the quantum phase transition in the two-dimensional random Ising model in a transverse field by Monte Carlo simulations. We find results similar to those known analyticall…
Phase diagram and magnons in quasi-one-dimensional dipolar antiferromagnets
M. Hummel, C. Pich, F. Schwabl
We investigate antiferromagnetic spin chains, which are coupled by a weak antiferromagnetic exchange interaction on a hexagonal lattice. We particulary study the role of the dipole…
Critical Behavior of the Two-Dimensional Random Quantum Ising Ferromagnet
C. Pich, A. P. Young
We study the quantum phase transition in the two-dimensional random Ising model in a transverse field by Monte Carlo simulations. We find results similar to those known analyticall…
Phase diagrams, critical and multicritical behavior of hard-core Bose-Hubbard models
C. Pich, E. Frey
We determine the zero-temperature phase diagram of the hard-core Bose-Hubbard model on a square lattice by mean-field theory supplemented by a linear spin-wave analysis. Due to the…
Incommensurate phases in ferromagnetic spin-chains with weak antiferromagnetic interchain interaction
C. Pich, F. Schwabl
We study planar ferromagnetic spin-chain systems with weak antiferromagnetic inter-chain interaction and dipole-dipole interaction. The ground state depends sensitively on the rela…
Spin waves and phase diagram of one-dimensional, dipolar antiferromagnets
M. Hummel, C. Pich, F. Schwabl
We report on the properties of a dipolar, antiferromagnetic chain in the framework of linear spin-wave theory. The phase diagram is calculated for an arbitrary ratio of dipolar int…