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Superluminal Pulse Propagation in a One-Sided Nanomechanical Cavity System

100%
Tarhan D.
Acta Physica Polonica A
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2013
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vol. 124
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issue 1
46-49
EN
We investigate the propagation of a pulse field in an optomechanical system. We examine the question of advance of the pulse under the conditions of electromagnetically induced transparency in the mechanical system contained in a high quality cavity. We show that the group delay can be controlled by the power of the coupling field. The time delay is negative which corresponds to superluminal light when there is a strong coupling between the nano-oscillator and the cavity.
2
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Effect of Dimple Potential on Ultraslow Light in a Bose-Einstein Condensate

63%
Tarhan D., Uncu H.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
141-143
EN
We investigate the propagation of ultraslow optical pulse in atomic Bose-Einstein condensate in a harmonic trap decorated with a dimple potential. The role of dimple potential on the group velocity and time delay is studied. Since we consider the interatomic scattering interactions, nonlinear Schrödinger equation or the Gross-Pitaevskii equation is used in order to get the density profile of the atomic system. We find large group delays of order 1 ms in an atomic Bose-Einstein condensate in a harmonic trap with a deep dimple potential.
3
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Dispersive Propagation of Ultraslow Pulses in an Atomic Bose-Einstein Condensate

51%
Tarhan D., Sefi S., Müstecaplıoğlu Ö.
Acta Physica Polonica A
|
2011
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vol. 120
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issue 6
992-997
EN
One-dimensional propagation of ultraslow optical pulses in an atomic Bose-Einstein condensate taking into account the dispersion and the spatial inhomogeneity is investigated. Analytical and semi-analytical solutions of the dispersive inhomogeneous wave equation modeling the ultraslow pulse propagation are developed and compared against the standard wave equation solvers based upon Cranck-Nicholson and pseudo-spectral methods. The role of curvature of the trapping potential of the condensate on the amount of dispersion of the ultraslow pulse is pointed out.
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