5 papers
Quantum Spin Glasses
H. Rieger, A. P. Young
Ising spin glasses in a transverse field exhibit a zero temperature quantum phase transition, which is driven by quantum rather than thermal fluctuations. They constitute a univers…
Griffiths Singularities in the Disordered Phase of a Quantum Ising Spin Glass
H. Rieger, A. P. Young
We study a model for a quantum Ising spin glass in two space dimensions by Monte Carlo simulations. In the disordered phase at , we find power law distributions of the local s…
A Numerical Study of the Random Transverse-Field Ising Spin Chain
A. P. Young, H. Rieger
We study numerically the critical region and the disordered phase of the random transverse-field Ising chain. By using a mapping of Lieb, Schultz and Mattis to non-interacting ferm…
Current--Voltage Characteristics of Two--Dimensional Vortex Glass Models
R. A. Hyman, M. Wallin, M. P. A. Fisher +2
We have performed Monte Carlo simulations to determine current--voltage characteristics of two different vortex glass models in two dimensions. The results confirm the conclusions…
Spin-1/2 Heisenberg-Antiferromagnet on the Kagome Lattice: High Temperature Expansion and Exact Diagonalisation Studies
N. Elstner, A. P. Young
For the spin- Heisenberg antiferromagnet on the Kagomé lattice we calculate the high temperature series for the specific heat and the structure factor. A comparison of…