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Cooper pair transport in arrays of Josephson junctions = Cooperpaartransport in Feldern von Josephson-Kontakten

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731501305 Year: Volume: 9 Pages: 148 p. DOI: 10.5445/KSP/1000037103 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:01:59
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this work, the fabrication, measurement and analysis of several one-dimensional SQUID arrays is described. The temperature and flux dependence of the thermally activated charge transport is analysed, and compared to a theoretical model.

Elastic and Inelastic Scanning Tunneling Spectroscopy on Iron-Based Superconductors

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731507475 Year: Volume: 23 Pages: III, 220 p. DOI: 10.5445/KSP/1000078103 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:02:01
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Within this work, the pairing mechanism of conventional (Pb) and unconventional superconductors (SrFe2(As1-xPx )2 , FeSe, FeSe/STO) was investigated experimentally by means of elastic and inelastic tunneling spectroscopy at temperatures down to 30 mK. The distinction between elastic and inelastic contributions to tunneling data was elaborated. The results help to identify conventional (phonon-mediated) and unconventional (e.g. spin-?uctuation mediated) superconductivity.

Investigation of coherent microscopic defects inside the tunneling barrier of a Josephson junction

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731502104 Year: Volume: 11 Pages: 111 p. DOI: 10.5445/KSP/1000040666 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:01:58
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In disordered solids, two-level atomic-tunneling systems are present in large quantity. Only recently, superconducting qubits opened a door for a detection and individual coherent manipulation of such microscopic quantum systems. We succeeded to tune the resonance frequencies of these systems by applying external strain on the qubit chip. Moreover, we observed and analyzed the interaction between two coupled tunneling systems.

Scanning Tunneling Spectroscopy on Electron-Boson Interactions in Superconductors

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731502388 Year: Volume: 13 Pages: VI, 128 p. DOI: 10.5445/KSP/1000041865 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:02:01
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This work describes the experimental study of electron-boson interactions in superconductors by means of inelastic electron tunneling spectroscopy performed with a scanning tunneling microscope (STM) at temperatures below 1 K. This new approach allows the direct measurement of the Eliashberg function of conventional superconductors as demonstrated on lead (Pb) and niobium (Nb). Preparative experiments on unconventional iron-pnictides are presented in the end.

STM Characterization of Phenylene-Ethynylene Oligomers on Au(111) and their Integration into Carbon Nanotube Nanogaps

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731502357 Year: Volume: 12 Pages: 125 p. DOI: 10.5445/KSP/1000041811 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:01:58
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Molecular electronics requires both profound knowledge of a molecule's structure and functionality on a surface and controlled positioning between electrodes with nanometer-sized gaps. In the first part of this work, a detailed scanning tunneling microscope study of two variants of oligo(phenylene ethynylene) molecules is presented. In the second part, methods of fabricating carbon nanotube nanogap electrodes as direct contacts to these molecules are explored.

Einfluss der Leitungselektronen auf die Dynamik atomarer Tunnelsysteme in ungeordneten Festkörpern: Relaxationsprozesse in metallischen Gläsern und ungeordneten dünnen Aluminiumoxid-Schichten

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731508700 Year: Volume: 22 Pages: II, 98 p. DOI: 10.5445/KSP/1000087939 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:02:01
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The speed of sound in metallic glasses and the permittivity of dielectric alumina layers show the typical low-temperature behavior of amorphous solids. Acoustic measurements from a few kHz to GHz show the influence of the conduction electrons in a massive bulk metallic glass. Measurements of the permittivity at a few kHz surprisingly show an influence of the electrons on the properties of an insulating layer.

Local Investigation of Single Magnetic Molecules with Scanning Tunneling Microscopy

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731508199 Year: Volume: 21 Pages: II, 128 p. DOI: 10.5445/KSP/1000084345 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-28 18:37:01
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We worked on different magnetic molecules containing 3d and 4f magnetic centers. Their growth on metallic surfaces, topographies, spin states, magnetic properties and electron transport were locally investigated by using scanning tunneling microscopy (STM) at temperatures down to 30mK. The main achievement of this dissertation reveals the abrupt switching of crystal fields during formation of molecular contacts.

Flexible Electronics: Fabrication and Ubiquitous Integration

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ISBN: 9783038978282 / 9783038978299 Year: Pages: 160 DOI: 10.3390/books978-3-03897-829-9 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Electrical and Nuclear Engineering
Added to DOAB on : 2019-06-26 08:44:06
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Flexible Electronics platforms are increasingly used in the fields of sensors, displays, and energy conversion with the ultimate goal of facilitating their ubiquitous integration in our daily lives. Some of the key advantages associated with flexible electronic platforms are: bendability, lightweight, elastic, conformally shaped, nonbreakable, roll-to-roll manufacturable, and large-area. To realize their full potential, however, it is necessary to develop new methods for the fabrication of multifunctional flexible electronics at a reduced cost and with an increased resistance to mechanical fatigue. Accordingly, this Special Issue seeks to showcase short communications, research papers, and review articles that focus on novel methodological development for the fabrication, and integration of flexible electronics in healthcare, environmental monitoring, displays and human-machine interactivity, robotics, communication and wireless networks, and energy conversion, management, and storage.

Cosmological Inflation, Dark Matter and Dark Energy

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ISBN: 9783039217649 / 9783039217656 Year: Pages: 236 DOI: 10.3390/books978-3-03921-765-6 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Mathematics
Added to DOAB on : 2019-12-09 11:49:16
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Various cosmological observations support not only cosmological inflation in the early universe, which is also known as exponential cosmic expansion, but also that the expansion of the late-time universe is accelerating. To explain this phenomenon, the existence of dark energy is proposed. In addition, according to the rotation curve of galaxies, the existence of dark matter, which does not shine, is also suggested. If primordial gravitational waves are detected in the future, the mechanism for realizing inflation can be revealed. Moreover, there exist two main candidates for dark matter. The first is a new particle, the existence of which is predicted in particle physics. The second is an astrophysical object which is not found by electromagnetic waves. Furthermore, there are two representative approaches to account for the accelerated expansion of the current universe. One is to assume the unknown dark energy in general relativity. The other is to extend the gravity theory to large scales. Investigation of the origins of inflation, dark matter, and dark energy is one of the most fundamental problems in modern physics and cosmology. The purpose of this book is to explore the physics and cosmology of inflation, dark matter, and dark energy.

Miniaturized Transistors

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ISBN: 9783039210107 / 9783039210114 Year: Pages: 202 DOI: 10.3390/books978-3-03921-011-4 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-06-26 08:44:06
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What is the future of CMOS? Sustaining increased transistor densities along the path of Moore's Law has become increasingly challenging with limited power budgets, interconnect bandwidths, and fabrication capabilities. In the last decade alone, transistors have undergone significant design makeovers; from planar transistors of ten years ago, technological advancements have accelerated to today's FinFETs, which hardly resemble their bulky ancestors. FinFETs could potentially take us to the 5-nm node, but what comes after it? From gate-all-around devices to single electron transistors and two-dimensional semiconductors, a torrent of research is being carried out in order to design the next transistor generation, engineer the optimal materials, improve the fabrication technology, and properly model future devices. We invite insight from investigators and scientists in the field to showcase their work in this Special Issue with research papers, short communications, and review articles that focus on trends in micro- and nanotechnology from fundamental research to applications.

Keywords

flux calculation --- etching simulation --- process simulation --- topography simulation --- CMOS --- field-effect transistor --- ferroelectrics --- MOS devices --- negative-capacitance --- piezoelectrics --- power consumption --- thin-film transistors (TFTs) --- compact model --- surface potential --- technology computer-aided design (TCAD) --- metal oxide semiconductor field effect transistor (MOSFET) --- topography simulation --- metal gate stack --- level set --- high-k --- fin field effect transistor (FinFET) --- line edge roughness --- metal gate granularity --- nanowire --- non-equilibrium Green’s function --- random discrete dopants --- SiGe --- variability --- band-to-band tunneling (BTBT) --- electrostatic discharge (ESD) --- tunnel field-effect transistor (TFET) --- Silicon-Germanium source/drain (SiGe S/D) --- technology computer aided design (TCAD) --- bulk NMOS devices --- radiation hardened by design (RHBD) --- total ionizing dose (TID) --- Sentaurus TCAD --- layout --- two-dimensional material --- field effect transistor --- indium selenide --- phonon scattering --- mobility --- high-? dielectric --- low-frequency noise --- silicon-on-insulator --- MOSFET --- inversion channel --- buried channel --- subthreshold bias range --- low voltage --- low energy --- theoretical model --- process simulation --- device simulation --- compact models --- process variations --- systematic variations --- statistical variations --- FinFETs --- nanowires --- nanosheets --- semi-floating gate --- synaptic transistor --- neuromorphic system --- spike-timing-dependent plasticity (STDP) --- highly miniaturized transistor structure --- low power consumption --- drain engineered --- tunnel field effect transistor (TFET) --- polarization --- ambipolar --- subthreshold --- ON-state --- doping incorporation --- plasma-aided molecular beam epitaxy (MBE) --- segregation --- silicon nanowire --- n/a

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