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Magnetized Plane Wave and Stripe-ord...

Putra, Andika.

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Magnetized Plane Wave and Stripe-ordered Phases in Spin-orbit-coupled Bose Gases.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Magnetized Plane Wave and Stripe-ordered Phases in Spin-orbit-coupled Bose Gases./
作者:	Putra, Andika.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	285 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Contained By:	Dissertation Abstracts International79-11B(E).
標題:	Atomic physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10749500
ISBN:	9780438149205

Magnetized Plane Wave and Stripe-ordered Phases in Spin-orbit-coupled Bose Gases.
Putra, Andika.

Magnetized Plane Wave and Stripe-ordered Phases in Spin-orbit-coupled Bose Gases. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 285 p.

Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.

Thesis (Ph.D.)--University of Maryland, College Park, 2018.

Quantum degenerate gases have provided rich systems to simulate engineered Hamiltonians and to explore quantum many-body problems in laboratory-scale experiments. In this work, I focus on spin-orbit-coupled (SOC) Bose-Einstein condensates (BECs) of Rubidium-87 atoms realized using two-photon Raman coupling in which various novel phases are predicted to exist due to competing energies from the atomic internal structure, coupling strength, and many-body collisions.

ISBN: 9780438149205Subjects--Topical Terms:

3173870
Atomic physics.

Magnetized Plane Wave and Stripe-ordered Phases in Spin-orbit-coupled Bose Gases.
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245 1 0 $a Magnetized Plane Wave and Stripe-ordered Phases in Spin-orbit-coupled Bose Gases.
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500 $a Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
500 $a Adviser: Steven Rolston.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2018.
520 $a Quantum degenerate gases have provided rich systems to simulate engineered Hamiltonians and to explore quantum many-body problems in laboratory-scale experiments. In this work, I focus on spin-orbit-coupled (SOC) Bose-Einstein condensates (BECs) of Rubidium-87 atoms realized using two-photon Raman coupling in which various novel phases are predicted to exist due to competing energies from the atomic internal structure, coupling strength, and many-body collisions.
520 $a BECs are observed primarily using the interaction between light and matter, where it is common to probe the atoms with near-resonant light and image their shadow on a camera. This absorption imaging technique measures the integrated column density of the atoms and it is crucial to focus the imaging system. I present a systematic method to bring the ultracold atom systems into an optimal focus using the power spectral density (PSD) of the atomic density-density correlation function. The spatial frequency at which the defocus-induced artifacts first appear in the PSD is maximized at the focus. The focusing process thus identifies the range of spatial frequencies over which the PSD is uncontaminated by finite-thickness effects.
520 $a Next, I describe magnetic phases which exist in spin-1 spin-orbit-coupled condensates at a near-zero temperature. I observe ferromagnetic and unmagnetized phases which are stabilized by the locking between the spin and linear momentum of the system. Our measurements of both the first- and second-order transitions are in agreement with theory.
520 $a Finally, I discuss the stripe-ordered phase that occurs in SOC Bose gases favoring the miscibility configuration. The stripe phase is theoretically predicted to have an excitation spectrum analogous to that of a supersolid and to exhibit spatial density modulation within specific regions of parameter space. I used optical Bragg scattering to probe the small density modulation present in the atomic spatial distribution. I present for the very first time observation of the stripe phase in a Raman SOC Bose gas and its phase diagram in various parameter space. Our observations of the phase boundaries are consistent with theory and previous work.
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