Manifestation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi><mml:mi>T</mml:mi></mml:math>Symmetry Breaking in Polarization Space with Terahertz Metasurfaces

Lawrence, Mark; Xu, Ningning; Zhang, Xueqian; Cong, Longqing; Han, Jiaguang; Zhang, Weili; Zhang, Shuang

doi:10.1103/physrevlett.113.093901

Cited by 218 publications

(161 citation statements)

References 37 publications

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“…First, a sharp change in polarization response of the system is possible at the exceptional points [22]. Later an omnipolarizer was designed for converting any light polarization into a given one [23].…”

Section: Introductionmentioning

confidence: 99%

PT symmetry breaking in multilayers with resonant loss and gain locks light propagation direction

et al. 2018

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Using the Maxwell-Bloch equations for resonantly absorbing and amplifying media, we study the temporal dynamics of light propagation through the PT -symmetric structures with alternating loss and gain layers. This approach allows us to precisely describe the response of the structure near the exceptional points of PT -symmetry breaking phase transition and, in particular, take into account the nonlinear effect of loss and gain saturation in the PT -symmetry broken state. We reveal that in this latter state the multilayer system possesses a lasing-like behavior releasing the pumped energy in the form of powerful pulses. We predict locking of pulse direction due to the PT -symmetry breaking, as well as saturation-induced irreversibility of phase transition and nonreciprocal transmission.

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Section: Introductionmentioning

confidence: 99%

PT symmetry breaking in multilayers with resonant loss and gain locks light propagation direction

et al. 2018

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“…Their relation to Fano resonances has been pointed out [24][25][26]. The experimental verification of their physical nature was achieved in microwave cavities [27][28][29], electronic circuits [30], metamaterials [31], a photonic crystal slab [32], and excitonpolariton resonances [33].…”

Section: Introductionmentioning

confidence: 99%

State flip at exceptional points in atomic spectra

et al. 2016

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We study the behavior of the non-adiabatic population transfer between resonances at an exceptional point in the spectrum of the hydrogen atom. It is known that, when the exceptional point is encircled, the system always ends up in the same state, independent of the initial occupation within the two-dimensional subspace spanned by the states coalescing at the exceptional point. We verify this behavior for a realistic quantum system, viz. the hydrogen atom in crossed electric and magnetic fields. It is also shown that the non-adiabatic hypothesis can be violated when resonances in the vicinity are taken into account. In addition, we study the non-adiabatic population transfer in the case of a third-order exceptional point, in which three resonances are involved.

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“…They appear in unstable lasers [28], resonators [29], and optical waveguides [30,31] as well. They have also been experimentally verified in metamaterials [32], a photonic crystal slab [33], electronic circuits [34], and in a chaotic exciton-polariton billiard system [35].…”

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confidence: 99%

Exceptional points in the elliptical three-disk scatterer using semiclassical periodic orbit quantization

Liebermann¹,

Main²

2017

EPL

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-The three-disk scatterer has served as a paradigm for semiclassical periodic orbit quantization of classical chaotic systems using Gutzwiller's trace formula. It represents an open quantum system, thus leading to spectra of complex eigenenergies. An interesting general feature of open quantum systems described by non-Hermitian operators is the possible existence of exceptional points where not only the complex eigenvalues but also their respective eigenvectors coincide. Using Gutzwiller's periodic orbit theory we show that exceptional points exist in a three-disk scatterer if the system's geometry is modified by extending the system from circular to elliptical disks. The extension is implemented in such a way that the system's characteristic C3v symmetry is preserved. The two-dimensional parameter plane of the system is then spanned by the distance between and the excentricity of the elliptical disks. As typical signatures of exceptional points we observe the permutation of two resonances when an exceptional point is encircled in parameter space, and a non-Lorentzian resonance line shape in the weighted density of states.

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Manifestation ofPTSymmetry Breaking in Polarization Space with Terahertz Metasurfaces

Cited by 218 publications

References 37 publications

PT symmetry breaking in multilayers with resonant loss and gain locks light propagation direction

PT symmetry breaking in multilayers with resonant loss and gain locks light propagation direction

State flip at exceptional points in atomic spectra

Exceptional points in the elliptical three-disk scatterer using semiclassical periodic orbit quantization

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