Topological Phases Protected by Point Group Symmetry
We consider symmetry-protected topological (SPT) phases with crystalline point group symmetry, dubbed point group SPT (pgSPT) phases. We show that such phases can be understood in terms of lower-dimensional topological phases with on-site symmetry and that they can be constructed as stacks and array...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2017-02-01
|
| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.7.011020 |
| _version_ | 1819117686538371072 |
|---|---|
| author | Hao Song Sheng-Jie Huang Liang Fu Michael Hermele |
| author_facet | Hao Song Sheng-Jie Huang Liang Fu Michael Hermele |
| author_sort | Hao Song |
| collection | DOAJ |
| description | We consider symmetry-protected topological (SPT) phases with crystalline point group symmetry, dubbed point group SPT (pgSPT) phases. We show that such phases can be understood in terms of lower-dimensional topological phases with on-site symmetry and that they can be constructed as stacks and arrays of these lower-dimensional states. This provides the basis for a general framework to classify and characterize bosonic and fermionic pgSPT phases, which can be applied for arbitrary crystalline point group symmetry and in arbitrary spatial dimensions. We develop and illustrate this framework by means of a few examples, focusing on three-dimensional states. We classify bosonic pgSPT phases and fermionic topological crystalline superconductors with Z_{2}^{P} (reflection) symmetry, electronic topological crystalline insulators (TCIs) with U(1)×Z_{2}^{P} symmetry, and bosonic pgSPT phases with C_{2v} symmetry, which is generated by two perpendicular mirror reflections. We also study surface properties, with a focus on gapped, topologically ordered surface states. For electronic TCIs, we find a Z_{8}×Z_{2} classification, where the Z_{8} corresponds to known states obtained from noninteracting electrons, and the Z_{2} corresponds to a “strongly correlated” TCI that requires strong interactions in the bulk. Our approach may also point the way toward a general theory of symmetry-enriched topological phases with crystalline point group symmetry. |
| first_indexed | 2024-12-22T05:36:56Z |
| format | Article |
| id | doaj.art-cf688202cffd4078ace3e077b669b488 |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-12-22T05:36:56Z |
| publishDate | 2017-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-cf688202cffd4078ace3e077b669b4882022-12-21T18:37:18ZengAmerican Physical SocietyPhysical Review X2160-33082017-02-017101102010.1103/PhysRevX.7.011020Topological Phases Protected by Point Group SymmetryHao SongSheng-Jie HuangLiang FuMichael HermeleWe consider symmetry-protected topological (SPT) phases with crystalline point group symmetry, dubbed point group SPT (pgSPT) phases. We show that such phases can be understood in terms of lower-dimensional topological phases with on-site symmetry and that they can be constructed as stacks and arrays of these lower-dimensional states. This provides the basis for a general framework to classify and characterize bosonic and fermionic pgSPT phases, which can be applied for arbitrary crystalline point group symmetry and in arbitrary spatial dimensions. We develop and illustrate this framework by means of a few examples, focusing on three-dimensional states. We classify bosonic pgSPT phases and fermionic topological crystalline superconductors with Z_{2}^{P} (reflection) symmetry, electronic topological crystalline insulators (TCIs) with U(1)×Z_{2}^{P} symmetry, and bosonic pgSPT phases with C_{2v} symmetry, which is generated by two perpendicular mirror reflections. We also study surface properties, with a focus on gapped, topologically ordered surface states. For electronic TCIs, we find a Z_{8}×Z_{2} classification, where the Z_{8} corresponds to known states obtained from noninteracting electrons, and the Z_{2} corresponds to a “strongly correlated” TCI that requires strong interactions in the bulk. Our approach may also point the way toward a general theory of symmetry-enriched topological phases with crystalline point group symmetry.http://doi.org/10.1103/PhysRevX.7.011020 |
| spellingShingle | Hao Song Sheng-Jie Huang Liang Fu Michael Hermele Topological Phases Protected by Point Group Symmetry Physical Review X |
| title | Topological Phases Protected by Point Group Symmetry |
| title_full | Topological Phases Protected by Point Group Symmetry |
| title_fullStr | Topological Phases Protected by Point Group Symmetry |
| title_full_unstemmed | Topological Phases Protected by Point Group Symmetry |
| title_short | Topological Phases Protected by Point Group Symmetry |
| title_sort | topological phases protected by point group symmetry |
| url | http://doi.org/10.1103/PhysRevX.7.011020 |
| work_keys_str_mv | AT haosong topologicalphasesprotectedbypointgroupsymmetry AT shengjiehuang topologicalphasesprotectedbypointgroupsymmetry AT liangfu topologicalphasesprotectedbypointgroupsymmetry AT michaelhermele topologicalphasesprotectedbypointgroupsymmetry |