| Autor: |
Xu C; Department of Physics, University of California, Santa Barbara, California 93106, USA., Ludwig AW; Department of Physics, University of California, Santa Barbara, California 93106, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2013 May 17; Vol. 110 (20), pp. 200405. Date of Electronic Publication: 2013 May 17. |
| DOI: |
10.1103/PhysRevLett.110.200405 |
| Abstrakt: |
We study the effects of a topological Theta term on 2+1-dimensional principal chiral models, which are nonlinear sigma models defined on Lie group manifolds. We find that when Θ=π, the nature of the disordered phase of the principal chiral model is strongly affected by the topological term: it is either a gapless conformal field theory, or it is gapped and twofold degenerate. The result of our Letter can be used to analyze the boundary states of three-dimensional symmetry protected topological phases. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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