Two Dimensional Transition Metal Dichalcogenides, Narayanasamy Sabari Arul
Автор: Kolobov Название: Two-Dimensional Transition-Metal Dichalcogenides ISBN: 3319314491 ISBN-13(EAN): 9783319314495 Издательство: Springer Рейтинг: Цена: 32669 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.
Автор: Alexander V. Kolobov; Junji Tominaga Название: Two-Dimensional Transition-Metal Dichalcogenides ISBN: 331981043X ISBN-13(EAN): 9783319810430 Издательство: Springer Рейтинг: Цена: 32669 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание:
Introduction.- Chemistry of Transition Metal Dichalcogenides.- Brief Review of Bulk TMDCs: Structure and Properties.- Fabrication of 2D TMDC.- Structure of Monolayer and Few-Layer TMDCs.- Band Structure of 2D TMDCs.- Raman Scattering Spectroscopy of 2D TMDCs.- Photoluminescence of 2D TMDC.- Excitons in 2D TMDCs.- Magnetism of 2D TMDCs.- Spin-Valley Coupling in 2D TMDCs.- Miscellaneous Phenomena.- Functionalization of 2D TMDCs.- TMDC Heterostructures.- Applications of 2D TMDCs.
Описание: 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.
Описание: 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. 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.
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