Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry
TLDR
The condition of self-adjointness as discussed by the authors ensures that the eigenvalues of a Hamiltonian are real and bounded below, replacing this condition by the weaker condition of $\mathrm{PT}$ symmetry, one obtains new infinite classes of complex Hamiltonians whose spectra are also real and positive.Abstract:
The condition of self-adjointness ensures that the eigenvalues of a Hamiltonian are real and bounded below. Replacing this condition by the weaker condition of $\mathrm{PT}$ symmetry, one obtains new infinite classes of complex Hamiltonians whose spectra are also real and positive. These $\mathrm{PT}$ symmetric theories may be viewed as analytic continuations of conventional theories from real to complex phase space. This paper describes the unusual classical and quantum properties of these theories.read more
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Journal ArticleDOI
Observation of parity–time symmetry in optics
Christian E. Rüter,Konstantinos G. Makris,Ramy El-Ganainy,Demetrios N. Christodoulides,Mordechai Segev,Detlef Kip +5 more
TL;DR: In this paper, the authors report the first observation of the behaviour of a PT optical coupled system that judiciously involves a complex index potential, and observe both spontaneous PT symmetry breaking and power oscillations violating left-right symmetry.
Journal ArticleDOI
Topological Photonics
Tomoki Ozawa,Hannah M. Price,Alberto Amo,Nathan Goldman,Mohammad Hafezi,Ling Lu,Mikael C. Rechtsman,David Schuster,Jonathan Simon,Oded Zilberberg,Iacopo Carusotto +10 more
TL;DR: Topological photonics is a rapidly emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light as mentioned in this paper, which holds great promise for applications.
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Making sense of non-Hermitian Hamiltonians
TL;DR: In this article, an alternative formulation of quantum mechanics in which the mathematical axiom of Hermiticity (transpose + complex conjugate) is replaced by the physically transparent condition of space?time reflection ( ) symmetry.
Journal ArticleDOI
Observation of PT-Symmetry Breaking in Complex Optical Potentials
A. Guo,Gregory J. Salamo,David Duchesne,Roberto Morandotti,M. Volatier-Ravat,Vincent Aimez,Georgios A. Siviloglou,Demetrios N. Christodoulides +7 more
TL;DR: This work demonstrates experimentally passive PT-symmetry breaking within the realm of optics, which leads to a loss induced optical transparency in specially designed pseudo-Hermitian guiding potentials.
Journal ArticleDOI
Parity–time-symmetric whispering-gallery microcavities
Bo Peng,Sahin Kaya Ozdemir,Fuchuan Lei,Fuchuan Lei,Faraz Monifi,Mariagiovanna Gianfreda,Gui-Lu Long,Shanhui Fan,Franco Nori,Carl M. Bender,Lan Yang +10 more
TL;DR: In this paper, it was shown that coupled optical microcavities bear all the hallmarks of parity-time symmetry; that is, the system dynamics are unchanged by both time-reversal and mirror transformations.
References
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Book
Advanced mathematical methods for scientists and engineers
Carl M. Bender,Steven A. Orszag +1 more
TL;DR: A self-contained presentation of the methods of asymptotics and perturbation theory, methods useful for obtaining approximate analytical solutions to differential and difference equations is given in this paper.