Parity-time-antisymmetric atomic lattices without gain
Year: 2015
Authors: Wu JH., Artoni M., La Rocca GC.
Autors Affiliation: NE Normal Univ, Ctr Quantum Sci, Changchun 130117, Peoples R China; European Lab Nonlinear Spect LENS, I-50019 Florence, Italy; Univ Brescia, Dept Engn & Informat Technol, I-25133 Brescia, Italy; Univ Brescia, CNR, INO, I-25133 Brescia, Italy; Scuola Normale Super Pisa, I-56126 Pisa, Italy; CNISM, I-56126 Pisa, Italy.
Abstract: Lossy atomic photonic crystals can be suitably tailored so that the real and imaginary parts of the susceptibility are, respectively, an odd and an even function of position. Such a parity-time (PT) space antisymmetry in the susceptibility requires neither optical gain nor negative refraction, but is rather attained by a combined control of the spatial modulation of both the atomic density and their dynamic level shift. These passive photonic crystals made of dressed atoms are characterized by a tunable unidirectional reflectionlessness accompanied by an appreciable degree of transmission. Interestingly, such peculiar properties are associated with non-Hermitian degeneracies of the crystal scattering matrix, which can then be directly observed through reflectivity measurements via a straightforward phase modulation of the atomic dynamic level shift and even off resonance
Journal/Review: PHYSICAL REVIEW A
Volume: 91 (3) Pages from: 33811-1 to: 33811-10
More Information: This work is supported by the National Natural Science Foundation (Grants No. 11174110 and No. 61378094) of China and the National Basic Research Program (Grant No. 2011CB921603) of China. J.-H.W. would like to acknowledge the hospitality of Scuola Normale Superiore at Pisa.KeyWords: Resonance States; SymmetryDOI: 10.1103/PhysRevA.91.033811Citations: 59data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-17References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here