Active control of parity-time symmetry phase transition in terahertz metasurface

2021 ◽  
pp. 127304
Author(s):  
Junxing Wang ◽  
Yun Shen ◽  
Xin Yu ◽  
Liner Zou ◽  
Shoujian Ouyang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Active Control ◽  
Time Symmetry ◽  
Symmetry Phase

Observation of a Parity-Time-Symmetry Phase Transition in a Fiber Cavity

2017 ◽  
Author(s):  
Ali K. Jahromi ◽  
Absar U. Hassan ◽  
Demetrois N. Christodoulides ◽  
Ayman F. Abouraddy
Keyword(s):  
Phase Transition ◽  
Time Symmetry ◽  
Symmetry Phase

scholarly journals Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Tao Chen ◽  
Wei Gou ◽  
Dizhou Xie ◽  
Teng Xiao ◽  
Wei Yi ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
State Of The Art ◽  
Cold Atom ◽  
Pt Symmetry ◽  
Level System ◽  
Flexible Control ◽  
Time Symmetry ◽  
Symmetry Phase ◽  
Lattice Quantum ◽  
Atomic Momentum

AbstractWe experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry over two lattice sites, where an effective dissipation is introduced through repeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effects manifest in our experiment as the overall dissipation of the two-level system becoming suppressed (enhanced) with increasing coupling intensity or frequency. We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase, and are bounded by exceptional points separating the PT symmetric and PT broken phases, as well as by a discrete set of critical coupling frequencies. Our experiment establishes the connection between PT-symmetry-breaking transitions and quantum Zeno effects, and is extendable to higher dimensions or to interacting regimes, thanks to the flexible control with atoms in a momentum lattice.

An organometallic half-sandwich supramolecular complex {K(18-Crown-6)(ηn-C6H5B(C6H5)3)} (n = 1–6) exhibiting a reversible breaking-symmetry phase transition and switchable dielectric behaviour

2018 ◽  
Vol 47 (47) ◽  
pp. 16835-16839 ◽  
Author(s):  
Guo-Jun Yuan ◽  
Dong-Sheng Shao ◽  
Zhi-Yuan Yao ◽  
Wen-Long Liu ◽  
Xiao-Ming Ren
Keyword(s):  
Phase Transition ◽  
Sandwich Structure ◽  
Dielectric Behavior ◽  
Supramolecular Complex ◽  
Dielectric Behaviour ◽  
Symmetry Phase ◽  
Half Sandwich ◽  
Breaking Symmetry

An organometallic supramolecular crystal of {K(18-crown-6)(ηn-C6H5B(C6H5)3)} (n = 1–6) has a half-sandwich structure and exhibits a reversible breaking-symmetry phase transition and switchable dielectric behavior.

scholarly journals Manifestation of the spontaneous parity-time symmetry breaking phase transition in hot-electron photodetection based on a tri-layered metamaterial

Nanophotonics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 495-504 ◽  
Author(s):  
Qiang Bai
Keyword(s):  
Phase Transition ◽  
Theoretical Model ◽  
Symmetry Breaking ◽  
Pt Symmetry ◽  
Coupled Mode Theory ◽  
Hot Electron ◽  
Electron Device ◽  
Coupled Mode ◽  
Time Symmetry ◽  
Existence Conditions

AbstractWe theoretically and numerically demonstrate that the spontaneous parity-time (PT) symmetry breaking phase transition can be realized respectively by using two independent tuning ways in a tri-layered metamaterial that consists of periodic array of metal-semiconductor Schottky junctions. The existence conditions of PT symmetry and its phase transition are obtained by using a theoretical model based on the coupled mode theory. A hot-electron photodetection based on the same tri-layered metamaterial is proposed, which can directly show the spontaneous PT symmetry breaking phase transition in photocurrent and possesses dynamical tunability and switchability. This work extends the concept of PT symmetry into the hot-electron photodetection, enriches the functionality of the metamaterial and the hot-electron device, and has varieties of potential and important applications in optoelectronics, photodetection, photovoltaics, and photocatalytics.

Broken symmetry phase transition in solid p-H2, o-D2 and HD: crystal field effects

1999 ◽  
Vol 265 (1-4) ◽  
pp. 12-15 ◽  
Author(s):  
Yu.A Freiman ◽  
R.J Hemley ◽  
A Jezowski ◽  
S.M Tretyak
Keyword(s):  
Phase Transition ◽  
Crystal Field ◽  
Broken Symmetry ◽  
Field Effects ◽  
Symmetry Phase

THE GROUNDSTATES AND PHASES OF THE TWO-DIMENSIONAL FULLY FRUSTRATED XY MODEL

2009 ◽  
Vol 23 (20n21) ◽  
pp. 3939-3950
Author(s):  
PETTER MINNHAGEN ◽  
SEBASTIAN BERNHARDSSON ◽  
BEOM JUN KIM
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Xy Model ◽  
Two Dimensional ◽  
Spin Configuration ◽  
Multicritical Points ◽  
Symmetry Phase

The 2D Fully Frustrated XY(FFXY) class of models is shown to contain a new groundstate in addition to the checkerboard groundstate of the standard 2D XY model. The spin configuration of this additional groundstate is obtained and its connection to a broken Z2-symmetry explained. This means that the class of 2D FFXY models belongs within a U(1) ⊗ Z2 ⊗ Z2-symmetry phase-transition representation. The phase diagram is reviewed and the central charges of the four multicritical points described. The implications for the standard 2D FFXY-model are discussed and elucidated, in particular with respect to the long standing controversy concerning the phase transitions of the standard 2D FFXY-model.

scholarly journals Broken symmetry phase transition in solid HD: a manifestation of quantum orientational melting

1998 ◽  
Vol 24 (7) ◽  
pp. 518-522 ◽  
Author(s):  
Yu. A. Freiman ◽  
S. M. Tretyak ◽  
A. Jeżowski ◽  
R. J. Hemley
Keyword(s):  
Phase Transition ◽  
Broken Symmetry ◽  
Symmetry Phase ◽  
Solid Hd

scholarly journals Photochemical Methods for the Real-Time Observation of Phase Transition Processes upon Crystallization

Symmetry ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 1726
Author(s):  
Fuyuki Ito
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Symmetry Breaking ◽  
Real Time ◽  
Fluorescence Spectra ◽  
Time Symmetry ◽  
Time Observation ◽  
Fluorescent Molecules ◽  
Real Time Observation ◽  
Crystal Phase Transformation

We have used the fluorescence detection of phase transformation dynamics of organic compounds by photochemical methods to observe a real-time symmetry breaking process. The organic fluorescent molecules vary the fluorescence spectra depending on molecular aggregated states, implying fluorescence spectroscopy can be applied to probe the evolution of the molecular-assembling process. As an example, the amorphous-to-crystal phase transformation and crystallization with symmetry breaking at droplet during the solvent evaporation of mechanofluorochromic molecules are represented in this review.

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