Non-reciprocal photonics based on time modulation

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Exceptional topology of non-Hermitian systems (2019, neutral): “Phenomenologically, this scenario is reminiscent of the concept of eigenstate thermalization (Deutsch, 1991; Srednicki, 1994), a generic feature of nonintegrable quantum systems with a large number of degrees of freedom, where the system acts as its own thermal bath for local observables.”
Serrodyne Frequency Translation Using Time-Modulated Metasurfaces (2019, background): “In addition to providing reconfigurable static functionalities, temporal modulation allows harmonic generation and nonreciprocal responses [1], [2].”
Bianisotropic metasurfaces: physics and applications (2018, background): “Nonreciprocal response can be achieved also by other means: materials moving with some speed, magnetless active materials mimicking electron spin precession of natural magnets [37, 84–86], nonlinear materials [38], time modulated materials [87].”
Broadband passive isolators based on coupled nonlinear resonances (2018, neutral): “Inserting equation (4) into equation (5) yields”