Irrational charge from topological order

Details Irrational charge from topological order Irrational charge from topological order

2010-04-13

arxiv.org/abs/1004.2154v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure with two panels

Scientific paper

Topological or deconfined phases of matter exhibit emergent gauge fields and quasiparticles that carry a corresponding gauge charge. In systems with an intrinsic conserved U(1) charge, such as all electronic systems where the Coulombic charge plays this role, these quasiparticles are also characterized by their intrinsic charge. We show that one can take advantage of the topological order fairly generally to produce periodic Hamiltonians which endow the quasiparticles with continuously variable, generically irrational, intrinsic charges. Examples include various topologically ordered lattice models, the three dimensional RVB liquid on bipartite lattices as well as water and spin ice. By contrast, the gauge charges of the quasiparticles retain their quantized values.

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