자료유형  

 학위논문

Control Number  

0017160945

International Standard Book Number  

9798383182031

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Tao, Junheng.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of Maryland, College Park., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

242 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-01, Section: B.

General Note  

Advisor: Spielman, Ian B.;Rolston, Steven.

Dissertation Note  

Thesis (Ph.D.)--University of Maryland, College Park, 2024.

Summary, Etc.  

요약Ultracold atoms emerge as a promising advanced platform for researching the principles of quantum mechanics. Its development of scientific understanding and technology enriches the toolbox for quantum simulations and quantum computations. In this dissertation work, we describe the methods we applied to build our new high-resolution 87Rb Bose-Einstein condensate (BEC) machine integrated with versatile quantum control and measurement tools. Then we describe the applications of these tools to the research of novel superfluidity and non-Hermitian physics.Superfluids and normal fluids were often studied in the context of Landau's two-fluid model, where the normal fluid stemmed from thermally excited atoms in a superfluid background. But can there be normal fluids in the ground state of a pure BEC, at near zero temperature? Our work addressed the understanding of this scenario, and then measured the anisotropic superfluid density in a density-modulated BEC, where the result matched the prediction of the Leggett formula proposed for supersolids. We further considered and measured this BEC in rotation and found a non-classical moment of inertia that sometimes turns negative. We distinguished the roles of superfluid and normal fluid flows, and linked some features to the dipolar and spin-orbit coupled supersolids.As a second direction, we describe our capability to create non-Hermiticity with Raman lasers, digital-micromirror device (DMD), and microwave, and present our work in engineering the real space non-Hermitian skin effect with a spin-orbit coupled BEC. By use of a spin-dependent dissipative channel, we realized an imaginary gauge potential which led to nonreciprocal transport in the flat box trap. We studied the system dynamics by quenching the dissipation, and further prepared stationary edge states. We link our discoveries to a non-Hermitian topological class characterized by a quantized winding number. Finally, we discuss the exciting promises of using these tools to study many-body physics open quantum systems.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Quantum physics.

Subject Added Entry-Topical Term  

Atomic physics.

Index Term-Uncontrolled  

Bose-Einstein condensates

Index Term-Uncontrolled  

Non-Hermitian physics

Index Term-Uncontrolled  

Quantum simulations

Index Term-Uncontrolled  

Superfluidity

Index Term-Uncontrolled  

Ultracold atoms

Added Entry-Corporate Name  

University of Maryland, College Park Chemical Physics

Host Item Entry  

Dissertations Abstracts International. 86-01B.

Electronic Location and Access  

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Control Number  

joongbu:654889