Non-Hermitian Degeneracies and Unidirectional Reflectionless Atomic Lattices

Year: 2014

Authors: Wu J.H., Artoni M., La Rocca G.C.

Autors Affiliation: NE Normal Univ, Ctr Quantum Sci, Changchun 130117, Peoples R China;
European Lab Nonlinear Spect, I-50019 Florence, Italy;
Univ Brescia, Dept Engn & Informat Technol, I-25133 Brescia, Italy;
Univ Brescia, INO CNR Sensor Lab, I-25133 Brescia, Italy;
Scuola Normale Super Pisa, I-56126 Pisa, Italy;
CNISM, I-56126 Pisa, Italy

Abstract: Light propagation in optical lattices of driven cold atoms exhibits non-Hermitian degeneracies when the first-order modulation amplitudes of real and imaginary parts of the probe susceptibility are manipulated to be balanced. At these degeneracies, one may observe complete unidirectional reflectionless light propagation. This strictly occurs with no gain and can be easily tuned and fully reversed as supported by the transfer-matrix calculations and explained via a coupled-mode analysis.


Volume: 113 (12)      Pages from: 123004  to: 123004

More Information: We would like to thank Simon Horsley for fruitful discussions. This work is supported by NSFC (Grants No. 11174110 and No. 61378094) and NBRP (Grant No. 2011CB921603) of China. J.-H.W. acknowledges the hospitality of Scuola Normale Superiore at Pisa.
DOI: 10.1103/PhysRevLett.113.123004

Citations: 114
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