P T -Symmetric Topological Edge-Gain Effect
We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the material is completely uniform. Such an effect can be constructed in any topological structure formed by two gapped subsy...
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| Veröffentlicht in: | Physical review letters 2020-07, Vol.125 (3), p.1, Article 033603 |
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| container_title | Physical review letters |
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| creator | Song, Alex Y. Sun, Xiao-Qi Dutt, Avik Minkov, Momchil Wojcik, Casey Wang, Haiwen Williamson, Ian A. D. Orenstein, Meir Fan, Shanhui |
| description | We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the material is completely uniform. Such an effect can be constructed in any topological structure formed by two gapped subsystems, e.g., a quantum spin-Hall system, with a suitable non-Hermitian coupling between the spins. The resulting complex-eigenvalued edge state is robust against defects due to the topological protection. In photonics, such an effect can be used for the implementation of topological lasers, in which a uniform pumping provides gain only in the edge lasing state. Furthermore, such a topological lasing model is reciprocal and is thus compatible with standard photonic platforms. |
| doi_str_mv | 10.1103/PhysRevLett.125.033603 |
| format | Article |
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D. ; Orenstein, Meir ; Fan, Shanhui</creator><creatorcontrib>Song, Alex Y. ; Sun, Xiao-Qi ; Dutt, Avik ; Minkov, Momchil ; Wojcik, Casey ; Wang, Haiwen ; Williamson, Ian A. D. ; Orenstein, Meir ; Fan, Shanhui</creatorcontrib><description>We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the material is completely uniform. Such an effect can be constructed in any topological structure formed by two gapped subsystems, e.g., a quantum spin-Hall system, with a suitable non-Hermitian coupling between the spins. The resulting complex-eigenvalued edge state is robust against defects due to the topological protection. In photonics, such an effect can be used for the implementation of topological lasers, in which a uniform pumping provides gain only in the edge lasing state. 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Furthermore, such a topological lasing model is reciprocal and is thus compatible with standard photonic platforms.</description><subject>Eigenvalues</subject><subject>Lasing</subject><subject>Photonics</subject><subject>Subsystems</subject><subject>Topology</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNpNkFFLwzAUhYMoWKd_QQo-Suq9SUzaRxl1CgWH1ueQtcnsaNeZdEL__Sr1wafzcA7fgY-QW4QEEfjD-msM7_ansMOQIHtMgHMJ_IxECCqjClGckwiAI80A1CW5CmEHAMhkGpH7dVzG9GPsOjv4porL_tC3_bapTBvn9dbSlWn2ce6crYZrcuFMG-zNXy7I53NeLl9o8bZ6XT4VtMIsHehG1sI4xl0FtePMiFpOBSglQAqUkhuBzKWmzpQCNDK1zApnbSqdcxtl-ILczdyD77-PNgx61x_9frrUTLCJhEKwaSXnVeX7ELx1-uCbzvhRI-hfMfqfGD2J0bMYfgLf51et</recordid><startdate>20200717</startdate><enddate>20200717</enddate><creator>Song, Alex Y.</creator><creator>Sun, Xiao-Qi</creator><creator>Dutt, Avik</creator><creator>Minkov, Momchil</creator><creator>Wojcik, Casey</creator><creator>Wang, Haiwen</creator><creator>Williamson, Ian A. 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| source | American Physical Society Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Eigenvalues Lasing Photonics Subsystems Topology |
| title | P T -Symmetric Topological Edge-Gain Effect |
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