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Non-Hermitian systems, with symmetric or antisymmetric Hamiltonians under the parity-time ($\mathcal{PT}$) operations, can have entirely real eigenvalues.
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Fleury, R.; Sounas, D.; Alù, A. An Invisible Acoustic Sensor Based on Parity-Time Symmetry. Nat. Commun. 2015
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Xu, H.; Mason, D.; Jiang, L.; Harris, J. G. E. Topological Energy Transfer in an Optomechanical System with Exceptional Points. Nature (London) 2016
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Miri, M.-A.; Alù, A. Exceptional Points in Optics and Photonics. Science 2019
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Li, J.; Harter, A. K.; Liu, J.; de Melo, L.; Joglekar, Y. N.; Luo, L. Observation of Parity-Time Symmetry Breaking Transitions in a Dissipative Floquet System of Ultracold Atoms. Nat. Commun. 2019
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Dong, Z.; Li, Z.; Yang, F.; Qiu, C.-W.; Ho, J. S. Sensitive Readout of Implantable Microsensors Using a Wireless System Locked to an Exceptional Point. Nat. Electron. 2019
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Xiao, Z.; Li, H.; Kottos, T.; Alù, A. Enhanced Sensing and Nondegraded Thermal Noise Performance Based on PT-Symmetric Electronic Circuits with a Sixth-Order Exceptional Point. Phys. Rev. Lett. 2019
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Cited alongside, same era.
Peng, P.; Cao, W.; Shen, C.; Qu, W.; Wen, J.; Jiang, L.; Xiao, Y. Anti-Parity-Time Symmetry with Flying Atoms. Nat. Phys. 2016
2016
Cited alongside, same era.
Huet, V. Millisecond Photon Lifetime in a Slow-Light Microcavity. Phys. Rev. Lett. 2016
2016
Cited alongside, same era.
Peng, B.; Özdemir, Ş. K.; Liertzer, M.; Chen, W.; Kramer, J.; Yılmaz, H.; Wiersig, J.; Rotter, S.; Yang, L. Chiral Modes and Directional Lasing at Exceptional Points. Proc. Natl. Acad. Sci. U.S.A. 2016
2016
Cited alongside, same era.
Assawaworrarit, S.; Yu, X.; Fan, S. Robust Wireless Power Transfer Using a Nonlinear Parity–Time-Symmetric Circuit. Nature (London) 2017
2017
Cited alongside, same era.
Hodaei, H.; Hassan, A. U.; Wittek, S.; Garcia-Gracia, H.; El-Ganainy, R.; Christodoulides, D. N.; Khajavikhan, M. Enhanced Sensitivity at Higher-Order Exceptional Points. Nature (London) 2017
2017
Cited alongside, same era.
Chen, W.; K Özdemir, Ş.; Zhao, G.; Wiersig, J.; Yang, L. Exceptional Points Enhance Sensing in an Optical Microcavity. Nature (London) 2017
2017
Cited alongside, same era.
Chen, P.; Tran, N. T.; Wen, X.; Xiong, Q.; Liedberg, B. Inflection Point of the Localized Surface Plasmon Resonance Peak: A General Method to Improve the Sensitivity. ACS Sens. 2017
2017
Cited alongside, same era.
2019
Later among the works it cites.
Wu, Y.; Liu, W.; Geng, J.; Song, X.; Ye, X.; Duan, C.-K.; Rong, X.; Du, J. Observation of Parity-Time Symmetry Breaking in a Single-Spin System. Science 2019
2019
Later among the works it cites.
Klauck, F.; Teuber, L.; Ornigotti, M.; Heinrich, M.; Scheel, S.; Szameit, A. Observation of PT-Symmetric Quantum Interference. Nat. Photonics 2019
2019
Later among the works it cites.
Jiang, Y.; Mei, Y.; Zuo, Y.; Zhai, Y.; Li, J.; Wen, J.; Du, S. Anti-Parity-Time Symmetric Optical Four-Wave Mixing in Cold Atoms. Phys. Rev. Lett. 2019
2019
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Li, Y.; Peng, Y.-G.; Han, L.; Miri, M.-A.; Li, W.; Xiao, M.; Zhu, X.-F.; Zhao, J.; Alù, A.; Fan, S.; Qiu, C.-W. Anti-Parity-Time Symmetry in Diffusive Systems. Science 2019
2019
Later among the works it cites.
Zhang, X.-L.; Jiang, T.; Chan, C. T. Dynamically Encircling an Exceptional Point in Anti-Parity-Time Symmetric Systems: Asymmetric Mode Switching for Symmetry-Broken Modes. Light Sci. Appl. 2019
2019
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Li, Q.; Zhang, C.-J.; Cheng, Z.-D.; Liu, W.-Z.; Wang, J.-F.; Yan, F.-F.; Lin, Z.-H.; Xiao, Y.; Sun, K.; Wang, Y.-T.; Tang, J.-S.; Xu, J.-S.; Li, C.-F.; Guo, G.-C. Experimental Simulation of Anti-Parity-Time Symmetric Lorentz Dynamics. Optica 2019
2019
Later among the works it cites.
Lai, Y.-H.; Lu, Y.-K.; Suh, M.-G.; Yuan, Z.; Vahala, K. Observation of the Exceptional-Point-Enhanced Sagnac Effect. Nature (London) 2019
2019
Later among the works it cites.
Hokmabadi, M. P.; Schumer, A.; Christodoulides, D. N.; Khajavikhan, M. Non-Hermitian Ring Laser Gyroscopes with Enhanced Sagnac Sensitivity. Nature (London) 2019
2019
Later among the works it cites.
Cao, W.; Lu, X.; Meng, X.; Sun, J.; Shen, H.; Xiao, Y. Reservoir-Mediated Quantum Correlations in Non-Hermitian Optical System. Phys. Rev. Lett. 2020
2020
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Zhao, J.; Liu, Y.; Wu, L.; Duan, C.-K.; Liu, Y.-x.; Du, J. Observation of Anti-PT-Symmetry Phase Transition in the Magnon-Cavity-Magnon Coupled System. Phys. Rev. Applied 2020
2020
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Zhang, F.; Feng, Y.; Chen, X.; Ge, L.; Wan, W. Synthetic Anti-PT Symmetry in a Single Microcavity. Phys. Rev. Lett. 2020
2020
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Qin, T.; Yang, J.; Zhang, F.; Chen, Y.; Shen, D.; Liu, W.; Chen, L.; Jiang, X.; Chen, X.; Wan, W. Fast- and Slow-Light-Enhanced Light Drag in a Moving Microcavity. Commun. Phys. 2020
2020
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Cao, P.; Li, Y.; Peng, Y.; Qiu, C.; Zhu, X. High-Order Exceptional Points in Diffusive Systems: Robust APT Symmetry against Perturbation and Phase Oscillation at APT Symmetry Breaking. ES Energy Environ. 2020
2020
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2020
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