Non-universal ordering of spin and charge in stripe phases

Details Non-universal ordering of spin and charge in stripe phases Non-universal ordering of spin and charge in stripe phases

2002-03-18

arxiv.org/abs/cond-mat/0203354v1

Physics

Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.89.095701

We study the interplay of topological excitations in stripe phases: charge dislocations, charge loops, and spin vortices. In two dimensions these defects interact logarithmically on large distances. Using a renormalization-group analysis in the Coulomb gas representation of these defects, we calculate the phase diagram and the critical properties of the transitions. Depending on the interaction parameters, spin and charge order can disappear at a single transition or in a sequence of two transitions (spin-charge separation). These transitions are non-universal with continuously varying critical exponents. We also determine the nature of the points where three phases coexist.

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