Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/119514
Title: Artificial Gauge Fields and Topological Effects in Quantum Gases
Authors: HU YU-XIN
Keywords: quantum gases, gauge fields, monopole, spin-orbit coupling, half skyrmion, meron pair
Issue Date: 23-Dec-2014
Source: HU YU-XIN (2014-12-23). Artificial Gauge Fields and Topological Effects in Quantum Gases. ScholarBank@NUS Repository.
Abstract: This thesis first proposes to generate an artificial non-Abelian U (3) gauge field by using a 2-tripod scheme, namely two tripod configurations sharing a common ground state level and driven by resonant 1-photon transitions. Using an appropriate combination of four Laguerre-Gauss and two Hermite-Gauss laser beams, we are able to produce a U (3)-monopole and a U (3) spin-orbit coupling for both alkali and alkaline-earth atoms. In the second part of this thesis, we provide a simple experimental scheme to generate topological spin textures in the ground state of interacting ultracold bosonic atoms loaded in a two-dimensional harmonic trap. Using a Gross-Pitaevskii description, we show that the ground state of the atomic system has different topological properties depending on the interaction strength and the laser beam intensity. A half-skyrmion state develops at low interactions while a meron pair develops at large interactions.
URI: http://scholarbank.nus.edu.sg/handle/10635/119514
Appears in Collections:Ph.D Theses (Open)

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