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Atomic and electronic properties of 2D moiré interfaces
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ISBN: 9783031120930 9783031120923 9783031120947 9783031120954 Year: 2022 Publisher: Cham, Switzerland : Springer,

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Abstract

This thesis provides the first atomic length-scale observation of the structural transformation (referred to as lattice reconstruction) that occurs in moiré superlattices of twisted bilayer transition metal dichalcogenides (TMDs) at low (θ < 2˚) twist angles. Studies using Scanning transmission electron microscopy (STEM) were limited due to the complexity of the (atomically-thin) sample fabrication requirements. This work developed a unique way to selectively cut and re-stack monolayers of TMDs with a controlled rotational twist angle which could then be easily suspended on a TEM grid to meet the needs of the atomically thin sample requirements. The fabrication technique enabled the study of the two common stacking-polytypes including 3R and 2H (using MoS2 and WS2 as the example) as well as their structural evolution with decreasing twist-angle. Also reported is a comprehensive investigation of electronic properties using scanning probe microscopy and electrical transport measurements of the artificially-engineered structures. These and other studies highlight the unique intrinsic properties of TMDs and their potential application in the development of the next generation of optoelectronics.

ISO Science Legacy : A Compact Review of ISO Major Achievements
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ISSN: 00386308 ISBN: 9781402038440 9781402038433 1402038437 9048169798 9786610624546 128062454X 1402038445 Year: 2005 Volume: v. 119 Publisher: Dordrecht : Springer Netherlands : Imprint: Springer,

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Stars are born and die in clouds of gas and dust, opaque to most types of radiation, but transparent in the infrared. Requiring complex detectors, space missions and cooled telescopes, infrared astronomy is the last branch of this discipline to come of age. After a very successful sky survey performed in the eighties by the IRAS satellite, the Infrared Space Observatory, in the nineties, brought spectacular advances in the understanding of the processes giving rise to powerful infrared emission by a great variety of celestial sources. Outstanding results have been obtained on the bright comet Hale-Bopp, and in particular of its water spectrum, as well as on the formation, chemistry and dynamics of planetary objects in the solar system. Ideas on the early stages of stellar formation and on the stellar initial mass function have been clarified. ISO is the first facility in space able to provide a systematic diagnosis of the physical phenomena and the chemistry in the close environment of pre-main sequence stars, in the interstellar medium, and in the final stages of stellar life, using, among other indicators, molecular hydrogen, ubiquitous crystalline silicates, water and ices. ISO has dramatically increased our ability to investigate the power production, excitation and fuelling mechanism of galaxies of every type, and has discovered a new very cold dust component in galaxies. ISO has demonstrated that luminous infrared galaxies were brighter and much more numerous in the past, and that they played a dominant role in shaping present day galaxies and in producing the cosmic infrared background.

Keywords

Chemical structure --- Space research --- Cosmology --- atoomstructuur --- meetmethoden --- kosmologie --- Astrophysics --- fysicochemie --- ruimtevaart --- astrofysica --- astrophysics --- astronomy --- Measuring methods in physics --- ruimte (astronomie) --- Chemical technology --- Orbiting astronomical observatories --- Infrared astronomy --- Infrared Space Observatory --- Astronomy --- Geophysics --- Astronomie --- Géophysique --- #ANTILTP9506 --- Periodicals --- Earth Sciences --- Physics --- Engineering --- Aerospace and Aeronautics --- Géophysique --- Périodiques --- Earth Sciences. --- Astronomy. --- Physics. --- Earth sciences. --- Infrared astronomy. --- Infrared Space Observatory. --- Astrophysics. --- Astronomy, Observations and Techniques. --- Astronomy, Astrophysics and Cosmology. --- Atomic, Molecular, Optical and Plasma Physics. --- Measurement Science and Instrumentation. --- Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics). --- Atomic/Molecular Structure and Spectra. --- Astronomical physics --- Cosmic physics --- Observations, Astronomical. --- Astronomy—Observations. --- Atoms. --- Physical measurements. --- Measurement   . --- Space sciences. --- Atomic structure  . --- Molecular structure . --- Structure, Molecular --- Structural bioinformatics --- Structure, Atomic --- Atomic theory --- Science and space --- Science --- Measuring --- Mensuration --- Mathematics --- Technology --- Metrology --- Physical measurements --- Measurements, Physical --- Mathematical physics --- Measurement --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Chemistry, Physical and theoretical --- Matter --- Stereochemistry --- Astronomical observations --- Observations, Astronomical --- Constitution --- Observations. --- ISO (Infrared Space Observatory) --- ISO --- European Space Agency.

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