Dynamics of solitons in Bose-Einstein Condensate and magnetic films

• Grant number: 08/53979-6
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: April 01, 2009
• End date: March 31, 2011
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Sadhan Kumar Adhikari
• Grantee: Yongshan Cheng
• Host Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil
• Associated research grant: 05/03001-1 - Study of Bose-Einstein condensation using mean-field theory, AP.TEM

Abstract

Solitons show unique properties and high potential for applications and, hence, have been one of the most exciting topics of research in modem nonlinear science. This research project is devoted to the theoretical investigation of soliton dynamics in Bose-Einstein condensate and magnetic thin films in the fields of condensed matter physics and materials science. In Bose-Einstein condensate we plan to study bright solitons for attractive atomic interaction and gap solitons for repulsive atomic interaction and for a periodic optical-lattice potential. The trapping periodic optical-lattice potential is routinely created in laboratory from a standing-wave polarized laser beam. Both bright and gap solitons have been observed in experiments with Bose-Einstein condensates. Another interesting example of physical systems where solitons have been created and studied experimentally is in the propagation of magnetostatic waves in thin films. We shall also study these magnetic solitons in thin films. In both Bose-Einstein condensate and in thin films, the investigation will be based on the nonlinear Schroedinger equation and the use of the Euler-Lagrange variational approach and the split-step Fourier method for its solution. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CHENG, YONGSHAN. Effective potential of two coupled binary matter wave bright solitons with spatially modulated nonlinearity. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, v. 42, n. 20, OCT 28 2009. (08/53979-6)

CHENG, YONGSHAN; LIU, FEI. Evolutions of matter-wave bright soliton with spatially modulated nonlinearity. CHINESE OPTICS LETTERS, v. 7, n. 9, p. 834-837, SEP 10 2009. (08/53979-6)