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Master's Dissertation
DOI
https://doi.org/10.11606/D.76.2016.tde-21102016-102725
Document
Author
Full name
Jhonny Richard Huamani Chaviguri
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2016
Supervisor
Committee
Caracanhas, Mônica Andrioli (President)
Bôas, Celso Jorge Villas
Gammal, Arnaldo
Title in Portuguese
Transição de fase quântica de sistema 2D em rede de vórtices
Keywords in Portuguese
Condensação de Bose-Einstein
Rede de vórtices
Transição de fase quântica
Abstract in Portuguese
Neste trabalho estudamos um sistema bidimensional composto de duas espécies atômicas condensadas, uma delas contendo uma rede de vórtices. Analogamente ao modelo desenvolvido para tratar de átomos ultrafrios em redes ópticas, mapeamos o Hamiltoniano do nosso sistema com o Hamiltoniano do modelo Bose-Hubbard (BH), com o potencial periódico da rede advindo da interação de campo médio entre as duas espécies. A variação do comprimento de espalhamento atômico permite alterar as propriedades do potencial confinante, com a indução da transição de fase quântica na espécie aprisionada nos vórtices. O novo aspecto trazido pela rede de vórtices advém dos seus modos de excitação de baixa energia, os modos de Tkachenko. Consideramos os efeitos da dinâmica própria desse potencial sobre a espécie aprisonada através de um modelo BH efetivo, com novos valores para interação local e tunelamento, além de um termo adicional de interação de longo alcance, mediada pelos modos da rede. Além de complementar os estudos com redes ópticas estáticas, a proposta teórica desenvolvida apresenta grande viabilidade experimental no contexto das técnicas atuais para manipulação de átomos ultrafrios.
Title in English
Quantum phase transition of 2D system in a vortex lattice
Keywords in English
BoseEinstein condensation
Quantum phase transition
Vortex lattice
Abstract in English
In this work we consider a two dimensional system composed of two condensed atomic species, one containing a vortex lattice. Analogously to the model used to describe ultracold atoms in optical lattices, we mapped our system Hamiltonian in the Hamiltonian of the Bose-Hubbard (BH) model, with the periodic lattice potential arising from the meanfield interaction between the two species. The variation of the atomic scattering length allow us to change the properties of the confining potential, to induce the quantum phase transition in the species trapped in the vortices. The new aspect brought by the vortex lattice comes with its low energy normal modes, the Tkachenko modes. We considered the effects of such dynamic potential over the confined species thought an effective BH model, with new values for the local interaction and tunneling parameters, besides an additional long-range interaction term mediated by the lattice modes. Our theoretical proposal goes beyond the studies with static optical lattice. Additionally, it has great feasibility in the current context of ultra-cold atoms experimental techniques.
 
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Publishing Date
2016-12-13
 
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