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Doctoral Thesis
DOI
10.11606/T.76.2014.tde-03022015-171234
Document
Author
Full name
Jorge Douglas Massayuki Kondo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2014
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Martinelli, Marcelo
Mendonça, Cleber Renato
Miranda, Marcio Heraclyto Gonçalves de
Pinto, Diogo de Oliveira Soares
Title in Portuguese
Estudo de colisões entre átomos de Rydberg ultrafrios em amostras atômicas aprisionadas numa armadilha óptica de dipolo
Keywords in Portuguese
Aprisionamento e resfriamento atômicos
Átomos de Rydberg
Átomos ultrafrios
Potenciais moleculares
Abstract in Portuguese
Neste trabalho, estudamos colisões entre átomos de Rydberg ultrafrios em uma amostra atômica de alta densidade aprisionada em uma armadilha óptica de dipolo (AOD) tipo QUEST (Quasi Electrostatic Trap). Nossos objetivos incluíam testar a manifestação de fenômenos de muitos corpos bem como estudar efeitos de anisotropia nos processos colisionais envolvendo dois corpos. Para isso, escolhemos o processo colisional descrito por 5/2+5/2(+2)3/2+(2)7/2 no intervalo de 37 ≤ ≤47. O processo foi estudado na ausência e presença de campo elétrico estático, originando as ressonâncias Förster. Os resultados mostram que mesmo em alta densidade atômica o processo de dois corpos domina a interação, apesar da clara manifestação do bloqueio dipolar. Após modificações na montagem experimental, estudamos um dos picos da ressonância Förster 375/2+375/2393/2+357/2 em função da direção e amplitude em relação ao eixo longitudinal da AOD. Discutimos os resultados e os desafios futuros do experimento.
Title in English
Study of collisions between ultracold Rydberg atoms in atomic samples trapped in an optical dipole trap
Keywords in English
Atomic trapping and cooling
Molecular potentials
Rydberg atoms
Ultracold atoms
Abstract in English
In this paper, we study collisions between ultracold Rydberg atoms in a high density atomic sample trapped in an optical dipole trap (ODT), type QUEST (Quasi Electrostatic Trap). Our goals included testing the manifestation of many-body phenomena and to study anisotropy effects in collisional processes involving two Rydberg atoms. In order to do this, we have chosen the collision process described by 5/2+5/2(+2)3/2+(2)7/2 in the range of 37 ≤ ≤47. The process was studied in the presence and absence of a dc static electric field, also known as Förster resonances. The results show that even at high atomic density, two-body interaction dominates de process, despite the clear manifestation of Rydberg blockade. After several improvements in our experimental setup, we have studied also a Förster resonance peak 375/2+375/2393/2+357/2 as a function of the magnitude of the dc static electric field as well as the angle between this field and the longitudinal axis of the ODT. We discuss the results and future challenges of the experiment.
 
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Publishing Date
2015-02-06
 
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