Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-08-22
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 8 figures, submitted to the Canadian Journal of Physics
Scientific paper
10.1139/P08-050
The antiferromagnetic Heisenberg two-leg ladder in the presence of frustration and an external magnetic field is a system that is characterized by two sorts of quantum criticalities, not only one. One criticality is the consequence of intrinsic frustration, and the other one is a result of the external magnetic field. So the behaviour of each of them in the presence of the other deserves to be studied. Using the Jordan-Wigner transformation in dimensions higher than one and bond-mean-field theory we examine the interplay between the field-induced and frustration-induced quantum criticalities in this system. The present work could constitute a prototype for those systems showing multiple, perhaps sometimes competing, quantum criticalities. We calculate several physical quantities like the magnetization and spin susceptibility as functions of field and temperature.
Azzouz Mohamed
Ramakko Brandon W.
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