Self-Shielded Topological Receiver Protectors

Reisner, Mattis; Jeon, Do Hyeok; Schindler, Carsten; Schomerus, Henning; Mortessagne, Fabrice; Kuhl, Ulrich

doi:10.1103/physrevapplied.13.034067

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…A perspective of this approach can be studied in a two-dimensional lattice such as a non-Hermitian Chern insulator, a non-Hermitian 2D Dirac semimetal, or a non-Hermitian Hofstadter model. Also, a nonlinear extension version of the transfer matrix can be considered for studying the transport effect in the nonlinear SSH model [46] ACKNOWLEDGMENTS The work on this article was initiated and partially developed during my research position at Lancaster University, and I acknowledge support from EPSRC via Programme Grant No. EP/N031776/1 in that time.…”

Section: Discussionmentioning

confidence: 99%

Transport effects in non-Hermitian nonreciprocal systems: General approach

Ghaemi-Dizicheh¹

2023

Preprint

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In this paper, we present a unifying analytical framework for identifying conditions for transport effects such as reflectionless and transparent transport, lasing, and coherent perfect absorption in non-Hermitian nonreciprocal systems using a generalized transfer matrix method. This provides a universal approach to studying the transport of tight-binding platforms, including higherdimensional models and those with an internal degree of freedom going beyond the previously studied case of one-dimensional chains with nearest-neighbor couplings. For a specific class of tight-binding models, the relevant transport conditions and their signatures of non-Hermitian, nonreciprocal, and topological behavior are analytically tractable from a general perspective. We investigate this class and illustrate our formalism in a paradigmatic ladder model where the system's parameters can be tuned to adjust the transport effect and topological phases.

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Section: Discussionmentioning

confidence: 99%

Transport effects in non-Hermitian nonreciprocal systems: General approach

Ghaemi-Dizicheh¹

2023

Preprint

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“…Of course in actual limiters one has to incorporate non-linear mechanisms that allow for a distinction between low and high incident power -the latter turning the limiter to its "off" state -, but for a proof of principle experiment it is sufficient to perform the permittivity variation parametrically, as carried out here. Non-linearities can be implemented in this microwave setup [18] and can be treated theoretically and numerically [19]. Figure 1 shows a photograph of the realized topological limiter using in total 8 dimers with intra-dimer distances of d 1 = 11 mm (coupling t 1 = 41.4 MHz) and inter-dimer distances d 2 = 13 mm (coupling t 2 = 21.2 MHz) with an average eigenfrequency of the resonators of ν 0 = 6.069 GHz (see also appendix A).…”

Section: Experimental Setup and Ct -Breakingmentioning

confidence: 99%

Microwave Limiters Implemented by Coupled Dielectric Resonators Based on a Topological Defect Mode and CT-Symmetry Breaking

et al. 2019

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We present a microwave realization of a reflective topological limiter based on an explicit selfinduced violation of a charge-conjugation (CT ) symmetry. The starting point is a bipartite structure created by coupled dielectric resonators with a topological defect placed at the center and two lossy resonators placed on the neighboring sites of the defect. This defect supports a resonant mode if the CT -symmetry is present, while it is suppressed once the symmetry is violated due to permittivity changes of the defect resonator associated with high irradiances of the incident radiation. This destruction leads to a suppression of transmittance and a subsequent increase of the reflectance while the absorption is also suppressed.

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“…Topological Fano resonance is immune to impurities, although it remains sensitive to system parameters [41]. A receiver protector was proposed and demonstrated employing a topological interface state of the SSH lattice [42]. Scattering methods to measure topological invariant have also been developed.…”

Section: Introductionmentioning

confidence: 99%

Signature of edge states in resonant wave scattering

Xu,

Zhang,

Jin

et al. 2022

Preprint

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Particle beam scattering is a conventional technique for detecting the nature of matter. We studied the scattering problem of a cluster connected to multiple leads. We established the connection between the eigenstate of the topological scattering center and the transmission and reflection amplitudes for the resonant scattering process. We discovered that as an application, this approach enables the detection of the edge state in the band gap for both Hermitian and non-Hermitian systems and the identification of the topology of a system. We investigated two types of Su-Schrieffer-Heeger chains as examples. In addition, we proposed a dynamic scheme through an evanescently coupledwaveguide array to detect the edge state on the basis of measured transmission intensity. Numerical simulation revealed that pattern visibility can be the signature of the edge states.

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Self-Shielded Topological Receiver Protectors

Cited by 14 publications

References 31 publications

Transport effects in non-Hermitian nonreciprocal systems: General approach

Transport effects in non-Hermitian nonreciprocal systems: General approach

Microwave Limiters Implemented by Coupled Dielectric Resonators Based on a Topological Defect Mode and CT-Symmetry Breaking

Signature of edge states in resonant wave scattering

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