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 Extracellular Matrix for Tissue Engineering and Biomaterials by Edbert Jarvis Sie
Cover of the book Arthropod Borne Diseases by Edbert Jarvis Sie
Cover of the book Distributed Computing and Internet Technology by Edbert Jarvis Sie
Cover of the book Advances in Production Management Systems. The Path to Intelligent, Collaborative and Sustainable Manufacturing by Edbert Jarvis Sie
Cover of the book Wellness City by Edbert Jarvis Sie
Cover of the book Teacher Education for the Changing Demographics of Schooling by Edbert Jarvis Sie
Cover of the book Quality of Life in Urban Landscapes by Edbert Jarvis Sie
Cover of the book If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY? by Edbert Jarvis Sie
Cover of the book Modeling and Stochastic Learning for Forecasting in High Dimensions by Edbert Jarvis Sie
Cover of the book Dynamics of Disasters—Key Concepts, Models, Algorithms, and Insights by Edbert Jarvis Sie
Cover of the book Community Informatics Design Applied to Digital Social Systems by Edbert Jarvis Sie
Cover of the book British Humanitarian Activity in Russia, 1890-1923 by Edbert Jarvis Sie
Cover of the book Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass by Edbert Jarvis Sie
Cover of the book Mathematics Achievement of Immigrant Students by Edbert Jarvis Sie
Cover of the book Regional Science Matters 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