Floquet π mode engineering in non-Hermitian waveguide lattices
Floquet topological systems exhibit rich physics associated with quasienergy band structures and new topological states; nevertheless, they are usually explored in Hermitian systems. Recent studies have shown the capability of non-Hermiticity in engineering topological states, while the interplay of...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-06-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.023211 |
| _version_ | 1797211021082886144 |
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| author | Shengjie Wu Wange Song Shenglun Gao Yuxin Chen Shining Zhu Tao Li |
| author_facet | Shengjie Wu Wange Song Shenglun Gao Yuxin Chen Shining Zhu Tao Li |
| author_sort | Shengjie Wu |
| collection | DOAJ |
| description | Floquet topological systems exhibit rich physics associated with quasienergy band structures and new topological states; nevertheless, they are usually explored in Hermitian systems. Recent studies have shown the capability of non-Hermiticity in engineering topological states, while the interplay of Floquet topological phases and non-Hermiticity remains unclear. Here, we reveal that the non-Hermitian modulation can induce the phase transitions between trivial and nontrivial topological Floquet states. Our study theoretically predicts that the non-Hermitian modulation can create a Floquet π mode in an originally topological trivial system according to the reopening of quasienergy band gap (i.e., the π gap), which is well confirmed experimentally in the silicon waveguide platform. Our approach shows the powerful capability of non-Hermitian modulation in engineering topological modes in Floquet photonics systems and would inspire different possibilities in optical field manipulation in open systems. |
| first_indexed | 2024-04-24T10:19:51Z |
| format | Article |
| id | doaj.art-d852135a05304f488d38f5d426731ce5 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:19:51Z |
| publishDate | 2021-06-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-d852135a05304f488d38f5d426731ce52024-04-12T17:10:48ZengAmerican Physical SocietyPhysical Review Research2643-15642021-06-013202321110.1103/PhysRevResearch.3.023211Floquet π mode engineering in non-Hermitian waveguide latticesShengjie WuWange SongShenglun GaoYuxin ChenShining ZhuTao LiFloquet topological systems exhibit rich physics associated with quasienergy band structures and new topological states; nevertheless, they are usually explored in Hermitian systems. Recent studies have shown the capability of non-Hermiticity in engineering topological states, while the interplay of Floquet topological phases and non-Hermiticity remains unclear. Here, we reveal that the non-Hermitian modulation can induce the phase transitions between trivial and nontrivial topological Floquet states. Our study theoretically predicts that the non-Hermitian modulation can create a Floquet π mode in an originally topological trivial system according to the reopening of quasienergy band gap (i.e., the π gap), which is well confirmed experimentally in the silicon waveguide platform. Our approach shows the powerful capability of non-Hermitian modulation in engineering topological modes in Floquet photonics systems and would inspire different possibilities in optical field manipulation in open systems.http://doi.org/10.1103/PhysRevResearch.3.023211 |
| spellingShingle | Shengjie Wu Wange Song Shenglun Gao Yuxin Chen Shining Zhu Tao Li Floquet π mode engineering in non-Hermitian waveguide lattices Physical Review Research |
| title | Floquet π mode engineering in non-Hermitian waveguide lattices |
| title_full | Floquet π mode engineering in non-Hermitian waveguide lattices |
| title_fullStr | Floquet π mode engineering in non-Hermitian waveguide lattices |
| title_full_unstemmed | Floquet π mode engineering in non-Hermitian waveguide lattices |
| title_short | Floquet π mode engineering in non-Hermitian waveguide lattices |
| title_sort | floquet π mode engineering in non hermitian waveguide lattices |
| url | http://doi.org/10.1103/PhysRevResearch.3.023211 |
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