New publication entitled „Quantum Monte Carlo study of the bond- and site-diluted transverse-field Ising model“
We are happy that our latest article on disordered quantum magnets has just been published in Physical Review B entitled “Quantum Monte Carlo study of the bond- and site-diluted transverse-field Ising model”. The article is joint work from LEP members Calvin Krämer, Max Hörmann, and Kai Phillip Schmidt.
In the article we study the transverse-field Ising model on a square lattice with bond and site dilution at zero temperature by stochastic series expansion quantum Monte Carlo simulations.
Both quantum phase diagrams show long-range order for small ℎ and small 𝑝. The ordered phase of each is separated from the disordered (quantum) Griffiths phase by second-order phase transitions on two critical lines touching at a multicritical point.
We find three internally consistent sets of critical exponents and compare them with potentially connected universality
classes.
Our results indicate that activated scaling occurs not only at the percolation transition, but also at the phase transition line for 𝑝 smaller than the percolation threshold 𝑝𝑐.