Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array
The introduction of non-Hermiticity into topological systems has led to a series of novel physical phenomena and produced application prospects. Here, we combine non-Hermitian and topological photonic systems based on a one-dimensional extended Su-Schrieffer-Heeger (SSH) model, which is composed of...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-02-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379724000548 |
| _version_ | 1797306908756934656 |
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| author | Ming-Jie Liao Mei-Song Wei Zijian Lin Jingping Xu Yaping Yang |
| author_facet | Ming-Jie Liao Mei-Song Wei Zijian Lin Jingping Xu Yaping Yang |
| author_sort | Ming-Jie Liao |
| collection | DOAJ |
| description | The introduction of non-Hermiticity into topological systems has led to a series of novel physical phenomena and produced application prospects. Here, we combine non-Hermitian and topological photonic systems based on a one-dimensional extended Su-Schrieffer-Heeger (SSH) model, which is composed of the optically coupled cavity array. We found that single on-site gain and loss do not induce the non-Hermitian skin effect (NHSE) in this model. Once the complex next-nearest-neighbor coupling is introduced, which is similar to asymmetric coupling, NHSE exists in the system. Adjusting the parameters of the system, we noted that the behavior of in-gap topological edge modes depends on the competition between non-Hermiticity and band topology. NHSE is featured with two edge modes localized at one end of the array, whereas the latter is characterized by two edge modes distributed at the two ends of the array. In addition, we reveal the condition that a system with gain and loss produces the non-Hermitian skin effect. Our research enriches the integration of non-Hermitian and topological photonics. |
| first_indexed | 2024-03-08T00:49:38Z |
| format | Article |
| id | doaj.art-0b5490b410d448bc9717da8d434c213c |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-03-08T00:49:38Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-0b5490b410d448bc9717da8d434c213c2024-02-15T05:23:47ZengElsevierResults in Physics2211-37972024-02-0157107372Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity arrayMing-Jie Liao0Mei-Song Wei1Zijian Lin2Jingping Xu3Yaping Yang4MOE Key Laboratory of Advanced Micro-Structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, ChinaMOE Key Laboratory of Advanced Micro-Structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, ChinaMOE Key Laboratory of Advanced Micro-Structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, ChinaCorresponding author.; MOE Key Laboratory of Advanced Micro-Structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, ChinaMOE Key Laboratory of Advanced Micro-Structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, ChinaThe introduction of non-Hermiticity into topological systems has led to a series of novel physical phenomena and produced application prospects. Here, we combine non-Hermitian and topological photonic systems based on a one-dimensional extended Su-Schrieffer-Heeger (SSH) model, which is composed of the optically coupled cavity array. We found that single on-site gain and loss do not induce the non-Hermitian skin effect (NHSE) in this model. Once the complex next-nearest-neighbor coupling is introduced, which is similar to asymmetric coupling, NHSE exists in the system. Adjusting the parameters of the system, we noted that the behavior of in-gap topological edge modes depends on the competition between non-Hermiticity and band topology. NHSE is featured with two edge modes localized at one end of the array, whereas the latter is characterized by two edge modes distributed at the two ends of the array. In addition, we reveal the condition that a system with gain and loss produces the non-Hermitian skin effect. Our research enriches the integration of non-Hermitian and topological photonics.http://www.sciencedirect.com/science/article/pii/S2211379724000548Non-Hermitian skin effectTopological edge modesBand topology |
| spellingShingle | Ming-Jie Liao Mei-Song Wei Zijian Lin Jingping Xu Yaping Yang Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array Results in Physics Non-Hermitian skin effect Topological edge modes Band topology |
| title | Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array |
| title_full | Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array |
| title_fullStr | Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array |
| title_full_unstemmed | Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array |
| title_short | Non-Hermitian skin effect induced by on-site gain and loss in the optically coupled cavity array |
| title_sort | non hermitian skin effect induced by on site gain and loss in the optically coupled cavity array |
| topic | Non-Hermitian skin effect Topological edge modes Band topology |
| url | http://www.sciencedirect.com/science/article/pii/S2211379724000548 |
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