263 citations · 772 across the 13 of their papers we have counts for
13 papers
Resolving the topology of encircling multiple exceptional points
Chitres Guria, Qi Zhong, Sahin K. Ozdemir +3
Non-Hermiticity has emerged as a new paradigm for controlling coupled-mode systems in ways that cannot be achieved with conventional techniques. One aspect of this control that has…
Tracking exceptional points above laser threshold
Kaiwen Ji, Qi Zhong, Li Ge +5
Recent studies on non-Hermitian optical systems having exceptional points (EPs) have revealed a host of unique characteristics associated with these singularities, including unidir…
The missing link between standing- and traveling-wave resonators
Qi Zhong, Haoqi Zhao, Liang Feng +3
Optical resonators are structures that utilize wave interference and feedback to confine light in all three dimensions. Depending on the feedback mechanism, resonators can support…
Observation of Chiral State Transfer Without Encircling an Exceptional Point
Hadiseh Nasari, Gisela Lopez-Galmiche, Helena E. Lopez-Aviles +7
The adiabatic theorem, a corollary of the Schrödinger equation, manifests itself in a profoundly different way in non-Hermitian arrangements, resulting in counterintuitive state tr…
Thermalization of light's orbital angular momentum in nonlinear multimode waveguide systems
Fan O. Wu, Qi Zhong, Huizhong Ren +3
We show that the orbital angular momentum (OAM) of a light field can be thermalized in a nonlinear cylindrical multimode optical waveguide. We find, that upon thermal equilibrium,…
Chiral Coherent Perfect Absorption on Exceptional Surfaces
S. Soleymani, Q. Zhong, M. Mokim +3
Engineering the transport of radiation and its interaction with matter using non-Hermiticity, particularly through spectral degeneracies known as exceptional points(EPs), is an eme…
Experimental observation of PT symmetry breaking near divergent exceptional points
M. Sakhdari, M. Hajizadegan, Q. Zhong +3
Standard exceptional points (EPs) are non-Hermitian degeneracies that occur in open systems. At an EP, the Taylor series expansion becomes singular and fails to converge -- a featu…
Hierarchical construction of higher-order exceptional points
Q. Zhong, J. Kou, S. K. Ozdemir +1
The realization of higher-order exceptional points (HOEPs) can lead to orders of magnitude enhancement in light-matter interactions beyond the current fundamental limits. Unfortuna…
Control of spontaneous emission dynamics in microcavities with chiral exceptional surfaces
Q. Zhong, A. Hashemi, S. K. Ozdemir +1
We investigate spontaneous emission from a quantum emitter located within the mode volume of a microring resonator that features chiral exceptional points. We show that this config…
Coherent virtual absorption of light in microring resonators
Q. Zhong, L. Simonson, T. Kottos +1
Light trapping and radiation process from linear reciprocal photonic resonators is one of the fundamental processes in optical science and engineering. Recently, the concept of coh…
Reply to "Comment on `Winding around non-Hermitian singularities' by Zhong et al., Nat. Commun. 9, 4808 (2018)"
Q. Zhong, M. Khajavikhan, D. N. Christodoulides +1
A comment has been recently posted on the arXiv (arXiv:1902.07504) that discuss our recent work on encircling multiple exceptional points in Nat. Commun. 9, 4808 (2018). In that co…
Sensing with exceptional surfaces: combining sensitivity with robustness
Q. Zhong, J. Ren, M. Khajavikhan +3
Exceptional points (EPs) are singularities that arise in non-Hermitian physics. Current research efforts focus only on systems supporting isolated EPs characterized by increased se…
Winding around Non-Hermitian Singularities: General Theory and Topological Features
Qi Zhong, Mercedeh Khajavikhan, Demetrios Christodoulides +1
Non-Hermitian singularities are ubiquitous in non-conservative open systems. These singularities are often points of measure zero in the eigenspectrum of the system which make them…