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Reference: Marcus Gildemeister, (2010). Trapping ultracold atoms in time-averaged adiabatic potentials. DPhil. University of Oxford.Citable link to this page:

 

Trapping ultracold atoms in time-averaged adiabatic potentials

Abstract: This thesis describes the trapping and manipulation of ultracold atoms in time-averaged adiabatic potentials (TAAP). The time-averaged adiabatic potential, proposed in [Phys. Rev. Lett. 99, 083001 (2007)], uses resonant radio frequency (rf) radiation to couple the different magnetic substates of a hyperfine level manifold. The resultant dressed states are time-averaged and produce smooth and versatile trapping geometries. More specifically, we apply rf-radiation (MHz) to a quadrupole magnetic field, which results in an ellipsoidal trapping potential for rubidium-87 atoms in the F=1 manifold. This geometry is time-averaged with the help of oscillating (kHz) Helmholtz fields.We develop a convenient loading scheme for the TAAP which uses a standard TOP trap and suffers negligible atom losses and heating. Subsequently we characterize the TAAP trap itself and observe low heating rates and sufficient lifetimes (>3s). Furthermore it is possible to use a second, weaker rf-field to evaporatively cool the atoms to quantum degeneracy [Phys. Rev. A. 81, 031402 (2010)]. This opens up a route for further experiments in this potential: we show how atoms can be trapped in a double well potential and a ring trap geometry. Additionally a process to instigate rotation in these potentials by rotating the polarization of the rf-radiation is developed and implemented. This allows us to impart angular momentum onto the atomic cloud and spin it into a ring.

Digital Origin:Born digital Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford

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Prof Christopher FootMore by this contributor

RoleSupervisor

 Bibliographic Details

Issue Date: 2010

Copyright Date: 2010 Identifiers

Urn: uuid:0572480a-9114-426e-b853-b6be30c7594e Item Description

Type: thesis;

Language: en Keywords: BEC TAAP adiabatic potentialSubjects: Physics Atomic and laser physics Tiny URL: ora:5672

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Author: Dr Marcus Gildemeister - institutionUniversity of Oxford facultyMathematical,Physical and Life Sciences Division - Physics - Atom

Source: https://ora.ox.ac.uk/objects/uuid:0572480a-9114-426e-b853-b6be30c7594e



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