Dynamics of quantum gas in non-abelian gauge field

Experimental observation of Zitterbewegung is considered a holy grail of the modern physics since its debut in 1930 by Schr odinger. In this thesis we describe the  first experimental observation of this effect in a two-dimensional ultracold atomic wave packet. In addition to that, we have also reve...

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Main Author: Hasan, Mehedi
Other Authors: David Wilkowski
Format: Thesis-Doctor of Philosophy
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/152148
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spelling sg-ntu-dr.10356-1521482023-02-28T23:41:30Z Dynamics of quantum gas in non-abelian gauge field Hasan, Mehedi David Wilkowski School of Physical and Mathematical Sciences david.wilkowski@ntu.edu.sg Science::Physics::Atomic physics::Quantum theory Science::Physics::Atomic physics::Properties of matter and antimatter Experimental observation of Zitterbewegung is considered a holy grail of the modern physics since its debut in 1930 by Schr odinger. In this thesis we describe the  first experimental observation of this effect in a two-dimensional ultracold atomic wave packet. In addition to that, we have also revealed the anisotropic of nature of Zitterbewegung, in the presence of non-Abelian Gauge  field. To observe this e ect, we have performed laser cooling in two major steps 461 nm magneto-optical trap (MOT) and 689 nm MOT and then loaded the atoms into an optical dipole trap. After performing optical pumping to one of the Zeeman states of the hyper ne ground-state, while atoms are inside the dipole trap, we have cooled down the strontium-87 atoms via evaporativ cooling and the gas enters the quantum regime at a T/T_F = 0.21(4), with Temperature T and Fermi temperature T_F. As the temperature of the gas (40-50 nK) is far below the recoil temperature(230 nK) of the atoms, we have performed experiments with the wave packet that reveals the envisaged Zitterbewegung effect. In order to demonstrate the anisotropy of the Zitterbewegung, we introduced a kick to the cold atomic wave packet so that the wave packet explores the momentumdependence of the energy eigenstates of the dressed Hamiltonian. We reveal the complete anisotropic nature of the Zitterbewegung amplitude and the relation of the oscillation frequency with the energy-gap between the two bands. We speculate that this could be a new way to map the band-diagram of a multi-band system. All the results are analyzed and explained with analytic calculations coupled with numerical analysis. Doctor of Philosophy 2021-07-22T00:34:58Z 2021-07-22T00:34:58Z 2021 Thesis-Doctor of Philosophy Hasan, M. (2021). Dynamics of quantum gas in non-abelian gauge field. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/152148 https://hdl.handle.net/10356/152148 10.32657/10356/152148 en This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics::Atomic physics::Quantum theory
Science::Physics::Atomic physics::Properties of matter and antimatter
spellingShingle Science::Physics::Atomic physics::Quantum theory
Science::Physics::Atomic physics::Properties of matter and antimatter
Hasan, Mehedi
Dynamics of quantum gas in non-abelian gauge field
description Experimental observation of Zitterbewegung is considered a holy grail of the modern physics since its debut in 1930 by Schr odinger. In this thesis we describe the  first experimental observation of this effect in a two-dimensional ultracold atomic wave packet. In addition to that, we have also revealed the anisotropic of nature of Zitterbewegung, in the presence of non-Abelian Gauge  field. To observe this e ect, we have performed laser cooling in two major steps 461 nm magneto-optical trap (MOT) and 689 nm MOT and then loaded the atoms into an optical dipole trap. After performing optical pumping to one of the Zeeman states of the hyper ne ground-state, while atoms are inside the dipole trap, we have cooled down the strontium-87 atoms via evaporativ cooling and the gas enters the quantum regime at a T/T_F = 0.21(4), with Temperature T and Fermi temperature T_F. As the temperature of the gas (40-50 nK) is far below the recoil temperature(230 nK) of the atoms, we have performed experiments with the wave packet that reveals the envisaged Zitterbewegung effect. In order to demonstrate the anisotropy of the Zitterbewegung, we introduced a kick to the cold atomic wave packet so that the wave packet explores the momentumdependence of the energy eigenstates of the dressed Hamiltonian. We reveal the complete anisotropic nature of the Zitterbewegung amplitude and the relation of the oscillation frequency with the energy-gap between the two bands. We speculate that this could be a new way to map the band-diagram of a multi-band system. All the results are analyzed and explained with analytic calculations coupled with numerical analysis.
author2 David Wilkowski
author_facet David Wilkowski
Hasan, Mehedi
format Thesis-Doctor of Philosophy
author Hasan, Mehedi
author_sort Hasan, Mehedi
title Dynamics of quantum gas in non-abelian gauge field
title_short Dynamics of quantum gas in non-abelian gauge field
title_full Dynamics of quantum gas in non-abelian gauge field
title_fullStr Dynamics of quantum gas in non-abelian gauge field
title_full_unstemmed Dynamics of quantum gas in non-abelian gauge field
title_sort dynamics of quantum gas in non-abelian gauge field
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/152148
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