Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-06-27
Phys.Rev.B74 224426 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
33 pages incl. 8 figures, accepted for publication in Phys.Rev.B
Scientific paper
A unifying approach to competing quantum orders in generalized two-leg spin ladders is presented. Hidden relationship and quantum phase transitions among the competing orders are thoroughly discussed by means of a low-energy field theory starting from an SU(4) quantum multicritical point. Our approach reveals that the system has a relatively simple phase structure in spite of its complicated interactions. On top of the U(1)-symmetry which is known from previous studies to mixes up antiferromagnetic order parameter with that of the p-type nematic, we find an emergent U(1)-symmetry which mixes order parameters dual to the above. On the basis of the field-theoretical- and variational analysis, we give a qualitative picture for the global structure of the phase diagram. Interesting connection to other models (e.g. bosonic t-J model) is also discussed.
Lecheminant Ph.
Totsuka Keisuke
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