期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.016404
关键词
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资金
- Simons Foundation
- ARO [W911NF-09-1-0527]
- NSF [DMR-0955778]
- Army Research Office [W911NF-12-1-0573]
- DARPA OLE Program
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0955778] Funding Source: National Science Foundation
Motivated by experimental progress in the growth of heavy transition metal oxides, we theoretically study a class of lattice models of interacting fermions with strong spin-orbit coupling. Focusing on interactions of intermediate strength, we derive a low-energy effective field theory for a fully gapped, topologically ordered, fractionalized state with an eightfold ground-state degeneracy. This state is a fermionic symmetry-enriched topological phase with particle-number conservation and time-reversal symmetry. The topological terms in the effective field theory describe a quantized magnetoelectric response and nontrivial mutual braiding statistics of dynamical extended vortex loops with emergent fermions in the bulk. We explicitly compute the expected mutual statistics in a specific model on the pyrochlore lattice within a slave-particle mean-field theory. We argue that our model also provides a possible condensed-matter realization of oblique confinement.
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