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Doctoral Thesis
Document
Author
Full name
Edmir Ravazzi Franco Ramos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2012
Supervisor
Committee
Bagnato, Vanderlei Salvador (President)
Adhikari, Sadhan Kumar
Courteille, Philippe Wilhelm
Mizrahi, Salomon Sylvain
Pereira, Rodrigo Gonçalves
Title in English
Oscillatory interaction in a Bose-Einstein condensate: collective and topological excitations
Abstract in English
In this work, we theoretically analyze the behavior of a Bose-Einstein condensate when it is submitted to oscillatory interactions. For that, a homogeneous magnetic field is applied, tuned near a Feshbach resonance, and then it is set to oscillate in time. This variation of the magnetic field causes a scattering length oscillation, which oscillates to interatomic interaction. Thus, we study collective and topological excitations due this oscillation in the interaction. In addition, we have seen a coupling between collective modes as well a dynamical phase transition associated to topological excitation
Title in Portuguese
Interações oscilatórias em um condensado de Bose-Einstein: excitações coletivas e topológicas
Keywords in Portuguese
Condensação de Bose-Einstein
Excitações coletivos
Modos topológicos
Abstract in Portuguese
Neste trabalho, analisamos teoricamente o comportamento de um condensado de Bose-Einstein quando submetido a interações oscilatórias. Para tal, é aplicado um campo magnético homogêneo, sintonizado próximo a uma ressonância de Feshbach e então colocado a oscilar no tempo. Esta variação do campo magnético faz com que o comprimento de espalhamento oscile, oscilando portanto a interação entre os átomos. Com isso, estudamos as excitações coletivas e topológicas provocadas devido a oscilação da interação. Além disso, vimos o acoplamento entre modos coletivos e uma transição de fase dinâmica associada a excitação topológica
 
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Publishing Date
2012-05-29
 
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