Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model

Details Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model

2008-05-16

arxiv.org/abs/0805.2500v2

Phys. Rev. Lett. 101, 127202 (2008)

Physics

Condensed Matter

Statistical Mechanics

4+ pages, 5 figures, version as published

Scientific paper

10.1103/PhysRevLett.101.127202

The two-dimensional $J$-$J^\prime$ dimerized quantum Heisenberg model is studied on the square lattice by means of (stochastic series expansion) quantum Monte Carlo simulations as a function of the coupling ratio \hbox{$\alpha=J^\prime/J$}. The critical point of the order-disorder quantum phase transition in the $J$-$J^\prime$ model is determined as \hbox{$\alpha_\mathrm{c}=2.5196(2)$} by finite-size scaling for up to approximately $10 000$ quantum spins. By comparing six dimerized models we show, contrary to the current belief, that the critical exponents of the $J$-$J^\prime$ model are not in agreement with the three-dimensional classical Heisenberg universality class. This lends support to the notion of nontrivial critical excitations at the quantum critical point.

Affiliated with

Also associated with

No associations

Rating

Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-272793