String and Membrane condensation on 3D lattices

Details String and Membrane condensation on 3D lattices String and Membrane condensation on 3D lattices

2004-11-30

arxiv.org/abs/cond-mat/0411752v2

Phys.Rev.B72:035307,2005

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, RevTeX4

Scientific paper

10.1103/PhysRevB.72.035307

In this paper, we investigate the general properties of lattice spin models that have string and/or membrane condensed ground states. We discuss the properties needed to define a string or membrane operator. We study three 3D spin models which lead to Z_2 gauge theory at low energies. All the three models are exactly soluble and produce topologically ordered ground states. The first model contains both closed-string and closed-membrane condensations. The second model contains closed-string condensation only. The ends of open-strings behave like fermionic particles. The third model also has condensations of closed membranes and closed strings. The ends of open strings are bosonic while the edges of open membranes are fermionic. The third model contains a new type of topological order.

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