Journal of Physical Chemistry & Biophysics
Open Access

Localization effect at the long distance in a weak disorder medium

5^th International Congress on Physics

March 03, 2022 | Webinar

Afifa Yedjour

Faculté de Physique, Algérie

Scientific Tracks Abstracts: J Phys Chem Biophys

Abstract :

Using the self-consistent born approximation to calculate the imaginary part of the self-energy which is related to the spectral function via the propator Green fuction.To do, we choose a laser speckle with a wavelength around 780 nm and an amplitude disorder of the order VR h = 1.845 kHz to analyze the localization characteristic of the colds atoms. These parameters are sufficient to reach the energy band and locate the band edge at EC = - 1(normalized by tne correlation energy. The small negative energies near zero values in the numeric results indicate the estimatevposition of the average ground state energy in local minima. For k = 0, the energy band becomes wider indicating that many atoms achieve energies and are delocalized. We find a fraction 36% of atoms can participate to the multiple diffusion. This number is quite different with predictions based on zero range correlations, in which case 45% were found to be delocalized.

Biography :

Afifa Yedjour is research teacher at University of Science and Technology of Oran - Mohamed Boudiaf (USTO-MB), Algeria. She was born in Oran city Des Enseignants of Algeria, graduated with master’s degree in Physics from the Sam Houston State University. Her research interest is in how diffusion of an expanding Bose-Einstein condensate released from a harmonic trap in a three-dimensional speckle disorder potential.