Researcher:
Karakaya, Evren

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PhD Student

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Evren

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Karakaya

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Karakaya, Evren

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20142

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Researcher Of Publications: search.filters.isAuthorOfPublication.4a72c797-0588-41d5-8cf1-5828e8faec0d

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    PublicationOpen Access
    Non-Hermitian quantum dynamics and entanglement of coupled nonlinear resonators
    (European Physical Society (EPS), 2014) Altıntaş, Ferdi; Department of Physics; Güven, Kaan; Karakaya, Evren; Müstecaplıoğlu, Özgür Esat; Faculty Member; Faculty Member; Department of Physics; College of Sciences; 52290; N/A; 1674
    We consider a generalization of a recently proposed non-Hermitian model for resonant cavities coupled by a chiral mirror by taking into account number non-conservation and nonlinear interactions. We analyze non-Hermitian quantum dynamics of populations and entanglement of the cavity modes. We find that the interplay between initial coherence and non-Hermitian coupling leads to a counterintuitive population transfer. While an initially coherent cavity mode is depleted, the other empty cavity can be populated more than or less than the initially filled one. Moreover, the presence of nonlinearity yields population collapse and revival as well as bipartite entanglement of the cavity modes. In addition to coupled cavities, we point out that similar models can be found in PT -symmetric Bose-Hubbard dimers of Bose-Einstein condensates or in coupled soliton-plasmon waveguides. We specifically illustrate the quantum dynamics of populations and entanglement in a heuristic model that we propose for a soliton-plasmon system with soliton amplitude-dependent asymmetric interaction. Degree of asymmetry, nonlinearity and coherence are examined to control plasmon excitations and soliton-plasmon entanglement. Relations to PT -symmetric lasers and Jahn-Teller systems are pointed out.
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    PublicationOpen Access
    Controlled excitations of surface plasmons via optical soliton photons in the quantum regime
    (Elsevier, 2014) Department of Physics; Güven, Kaan; Karakaya, Evren; Müstecaplıoğlu, Özgür Esat; Faculty Member; Faculty Member; Department of Physics; College of Sciences; 52290; N/A; 1674
    We examine the quantum dynamics of surface plasmons weakly coupled to optical soliton photons in a metal-dielectric-nonlinear Kerr medium interface. We consider a photon-number-dependent coupling model which is a heuristic extension of the classical soliton excitation of surface plasmons in the quantum limit. The coupling coefficient additionally depends on the distance between the dielectric and the metal. We propose a practical scheme to control the number of surface plasmons using a Gaussian variation of the metal-dielectric spatial separation. Our numerical simulations show that the curvature of the Gaussian distance profile can be used for controlling the number of surface plasmons.