Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-05-04
PRB 75, 104405 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
Extensive revisions. Two new models with contious quantum phase transition
Scientific paper
We have considered the $S=1/2$ antiferromagnetic Heisenberg model in two dimensions, with an additional Ising \nnn interaction. Antiferromagnetic \nnn interactions will lead to frustration, and the system responds with flipping the spins down in the $xy$ plane. For large next nearest neighbour coupling the system will order in a striped phase along the z axis, this phase is reached through a first order transition. We have considered two generalizations of this model, one with random \nnn interactions, and one with an enlarged unit cell, where only half of the atoms have \nnn interactions. In both cases the transition is softened to a second order transition separating two ordered states. In the latter case we have estimated the quantum critical exponent $\beta \approx 0.25$. These two cases then represent candidate examples of deconfined quantum criticality.
Hove Joakim
Sudbø Asle
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