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Engineering Excitons in Low-Dimensio...

Vong, Albert.

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Engineering Excitons in Low-Dimensional Semiconductors for Quantum Emission.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Engineering Excitons in Low-Dimensional Semiconductors for Quantum Emission./
作者:	Vong, Albert.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	148 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
Contained By:	Dissertations Abstracts International85-06B.
標題:	Quantum physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30690152
ISBN:	9798381175349

Engineering Excitons in Low-Dimensional Semiconductors for Quantum Emission.
Vong, Albert.

Engineering Excitons in Low-Dimensional Semiconductors for Quantum Emission. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 148 p.

Source: Dissertations Abstracts International, Volume: 85-06, Section: B.

Thesis (Ph.D.)--Northwestern University, 2023.

This dissertation explores ways to use different excitonic states in 2-dimensional (2D) and quasi 2D semiconductors as single photon emitters (SPEs). SPEs are any two-level system that can emit a photon on-demand and one-at-a-time. Solid state materials can host a variety of SPE states, the properties of which depend on their fine structure and nanoscopic environment. 2D systems are especially attractive due to their fast emission lifetimes and sensitivity to environment, allowing unprecedented tunability of their quantum degrees of freedom. However, the mechanisms of SPE in many 2D platforms remain poorly understood, limiting their feasibility as SPE materials. This dissertation focuses on the formation mechanisms of 2 different excitonic states for SPE: i) trions in CdSe semiconductor nanoplatelets and ii) strain-localized excitons in WSe2. Trions, an exciton bound to an additional charge, require a biexciton to form in CdSe nanoplatelets. Strain-induced SPEs in WSe2 form in close proximity to other emission sources, which often ruin their single photon purity. Fortunately, SPEs with high single photon purity can be produced by introducing midgap states using e−-beam exposure, which helps elucidate their formation mechanism. Beyond exploratory studies, our ability to understand and improve the SPE capabilities of these systems can be furthered through six suggested routes: coherence lifetime measurements using photon correlation Fourier spectroscopy, robust statistical studies using high-throughput hyperspectral mapping, Purcell-enhancement of T1,0-D state injection, potential engineering beyond strain and Mo-based SPEs instead of W-based ones.

ISBN: 9798381175349Subjects--Topical Terms:

726746
Quantum physics.
Subjects--Index Terms:

Single photon emitters

Engineering Excitons in Low-Dimensional Semiconductors for Quantum Emission.
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