Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides

Nonfiction, Science & Nature, Science, Physics, Solid State Physics, Technology, Material Science
Cover of the book Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides by Edbert Jarvis Sie, Springer International Publishing
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: Edbert Jarvis Sie ISBN: 9783319695549
Publisher: Springer International Publishing Publication: November 11, 2017
Imprint: Springer Language: English
Author: Edbert Jarvis Sie
ISBN: 9783319695549
Publisher: Springer International Publishing
Publication: November 11, 2017
Imprint: Springer
Language: English

This thesis presents optical methods to split the energy levels of electronic valleys in transition-metal dichalcogenides (TMDs) by means of coherent light-matter interactions. The electronic valleys found in monolayer TMDs such as MoS2, WS2, and WSe2 are among the many novel properties exhibited by semiconductors when thinned down to a few atomic layers, and have have been proposed as a new way to carry information in next generation devices (so-called valleytronics). These valleys are, however, normally locked in the same energy level, which limits their potential use for applications. The author describes experiments performed with a pump-probe technique using transient absorption spectroscopy on MoS2 and WS2. It is demonstrated that hybridizing the electronic valleys with light allows one to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, one can tune the energy level of one valley through the optical Stark effect. Also presented within are observations, at larger detuning, of a separate contribution from the so-called Bloch--Siegert effect, a delicate phenomenon that has eluded direct observation in solids. The two effects obey opposite selection rules, enabling one to separate the two effects at two different valleys.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

This thesis presents optical methods to split the energy levels of electronic valleys in transition-metal dichalcogenides (TMDs) by means of coherent light-matter interactions. The electronic valleys found in monolayer TMDs such as MoS2, WS2, and WSe2 are among the many novel properties exhibited by semiconductors when thinned down to a few atomic layers, and have have been proposed as a new way to carry information in next generation devices (so-called valleytronics). These valleys are, however, normally locked in the same energy level, which limits their potential use for applications. The author describes experiments performed with a pump-probe technique using transient absorption spectroscopy on MoS2 and WS2. It is demonstrated that hybridizing the electronic valleys with light allows one to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, one can tune the energy level of one valley through the optical Stark effect. Also presented within are observations, at larger detuning, of a separate contribution from the so-called Bloch--Siegert effect, a delicate phenomenon that has eluded direct observation in solids. The two effects obey opposite selection rules, enabling one to separate the two effects at two different valleys.

More books from Springer International Publishing

Cover of the book The Hippocampus from Cells to Systems by Edbert Jarvis Sie
Cover of the book Machining with Nanomaterials by Edbert Jarvis Sie
Cover of the book Social Media Marketing in Tourism and Hospitality by Edbert Jarvis Sie
Cover of the book Nonmalignant Hematology by Edbert Jarvis Sie
Cover of the book The Relevance of Academic Work in Comparative Perspective by Edbert Jarvis Sie
Cover of the book Damage Tolerance of Metallic Aircraft Structures by Edbert Jarvis Sie
Cover of the book Re-Evaluating Regional Organizations by Edbert Jarvis Sie
Cover of the book Multiple Representations in Physics Education by Edbert Jarvis Sie
Cover of the book Database and Expert Systems Applications by Edbert Jarvis Sie
Cover of the book Deep Learning and Data Labeling for Medical Applications by Edbert Jarvis Sie
Cover of the book Locating, Classifying and Countering Agile Land Vehicles by Edbert Jarvis Sie
Cover of the book Global Chemical Kinetics of Fossil Fuels by Edbert Jarvis Sie
Cover of the book Cartilage Regeneration by Edbert Jarvis Sie
Cover of the book Web Technologies and Applications by Edbert Jarvis Sie
Cover of the book Religion and Human Rights by Edbert Jarvis Sie
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy