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Author: Hong Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Book Description
The realization of a two-dimensional electron gas in semiconductor heterostructures due to advanced epitaxial growth techniques has led to novel high-speed devices such as modulation-doped field effect transistors and quantum well lasers. High resolution lithography and pattern transfer techniques now make it possible to further restrict the electronic motion to lower dimensions. A variety of interesting quantum confinement phenomena have been observed in these mesoscopic systems. This thesis describes the design principle, fabrication technique, and transport characterization of various low-dimensional quantum devices. Nanostructure fabrication techniques are presented in detail in the thesis, from high resolution electron beam lithography, pattern transfer techniques, to various one-dimensional (1D) and zero-dimensional (0D) structures with dimensions in the nanometer scale. The effective wire width as well as sidewall damage for both deep etched and shallow etched quantum wires are characterized by the electrical conductance measurement. Artificial lateral surface superlattice (LSSL) structures of line and dot arrays are fabricated using multilayer resist techniques. A typical 1D quantized conductance of $rm 2esp2/h$ is shown in an airbridge split gate device. Plateaulike transport characteristics are demonstrated in airbridge LSSL gate devices due to electrostatic confinement modulation. Laterally tunable single-gate quantum dot and double-bend quantum dot devices are fabricated and investigated. Negative differential conductance is observed at various drain bias conditions in both of these quantum dot devices. Conductance oscillations observed at a temperature as high as 10 K are, to our understanding, the highest temperature reported in similar laterally confined quantum dot devices.
Author: Hong Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Book Description
The realization of a two-dimensional electron gas in semiconductor heterostructures due to advanced epitaxial growth techniques has led to novel high-speed devices such as modulation-doped field effect transistors and quantum well lasers. High resolution lithography and pattern transfer techniques now make it possible to further restrict the electronic motion to lower dimensions. A variety of interesting quantum confinement phenomena have been observed in these mesoscopic systems. This thesis describes the design principle, fabrication technique, and transport characterization of various low-dimensional quantum devices. Nanostructure fabrication techniques are presented in detail in the thesis, from high resolution electron beam lithography, pattern transfer techniques, to various one-dimensional (1D) and zero-dimensional (0D) structures with dimensions in the nanometer scale. The effective wire width as well as sidewall damage for both deep etched and shallow etched quantum wires are characterized by the electrical conductance measurement. Artificial lateral surface superlattice (LSSL) structures of line and dot arrays are fabricated using multilayer resist techniques. A typical 1D quantized conductance of $rm 2esp2/h$ is shown in an airbridge split gate device. Plateaulike transport characteristics are demonstrated in airbridge LSSL gate devices due to electrostatic confinement modulation. Laterally tunable single-gate quantum dot and double-bend quantum dot devices are fabricated and investigated. Negative differential conductance is observed at various drain bias conditions in both of these quantum dot devices. Conductance oscillations observed at a temperature as high as 10 K are, to our understanding, the highest temperature reported in similar laterally confined quantum dot devices.
Author: Sabu Thomas
Publisher: Elsevier
ISBN: 012820883X
Category : Technology & Engineering
Languages : en
Pages : 610
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Book Description
Design, Fabrication, and Characterization of Multifunctional Nanomaterials covers major techniques for the design, synthesis, and development of multifunctional nanomaterials. The chapters highlight the main characterization techniques, including X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and scanning probe microscopy.The book explores major synthesis methods and functional studies, including: - Brillouin spectroscopy; - Temperature-dependent Raman spectroscopic studies; - Magnetic, ferroelectric, and magneto-electric coupling analysis; - Organ-on-a-chip methods for testing nanomaterials; - Magnetron sputtering techniques; - Pulsed laser deposition techniques; - Positron annihilation spectroscopy to prove defects in nanomaterials; - Electroanalytic techniques. This is an important reference source for materials science students, scientists, and engineers who are looking to increase their understanding of design and fabrication techniques for a range of multifunctional nanomaterials. - Explains the major design and fabrication techniques and processes for a range of multifunctional nanomaterials; - Demonstrates the design and development of magnetic, ferroelectric, multiferroic, and carbon nanomaterials for electronic applications, energy generation, and storage; - Green synthesis techniques and the development of nanofibers and thin films are also emphasized.
Author: M. Balkanski
Publisher: Springer Science & Business Media
ISBN: 9401589658
Category : Technology & Engineering
Languages : en
Pages : 297
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Book Description
This volume on Advanced Electronic Technologies and Systems based on Low Dimensional Quantum Devices closes a three years series of NATO -AS!' s. The first year was focused on the fundamental properties and applications. The second year was devoted to Devices Based on Low-Dimensional Semiconductor Structures. The third year is covering Systems Based on Low-Dimensional Quantum Semiconductor Devices. The three volumes containing the lectures given at the three successive NATO -ASI's constitute a complete review on the latest advances in semiconductor Science and Technology from the methods of fabrication of the quantum structures through the fundamental physics am basic knowledge of properties and projection of performances to the technology of devices and systems. In the first volume: " Fabrication, Properties and Application of Low Dimensional Semiconductors" are described the practical ways in which quantum structures are produced, the present status of the technology, difficulties encountered, and advances to be expected. The basic theory of Quantum Wells, Double Quantum Wells and Superlattices is introduced and the fundamental aspects of their optical properties are presented. The effect of reduction of dimensionality on lattice dynamics of quantum structures is also discussed. In the second volume: " Devices Based on Low Dimensional Structures" the fundamentals of quantum structures and devices in the two major fields: Electro-Optical Devices and Pseudomorphic High Eectron Mobility Transistors are extensively discussed.
Author: Syed Kamrul Islam
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
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Book Description
Author: Michael G. Cottam
Publisher: IOP Publishing Limited
ISBN: 9780750310550
Category : Science
Languages : en
Pages : 0
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Book Description
The last few years have seen dramatic advances in the growth, fabrication and characterization of low-dimensional materials and nanostructures. Most studies of these artificially engineered materials have been driven by their potential for device applications that involve smaller and smaller physical dimensions. In particular, the dynamical properties of these materials are of fundamental interest for the devices that involve high-frequency operation and/or switching. Consequently, the different excitations, vibrational, magnetic, optical, electronic, and so on, need to be understood from the perspective of how their properties are modified in finite structures, especially on the nanometre length scale due to the presence of surfaces and interfaces.
Author: University of Illinois (Urbana-Champaign campus). Engineering Experiment Station
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 416
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Book Description
Author:
Publisher:
ISBN:
Category : Optoelectronic devices
Languages : en
Pages : 818
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Book Description
Author: Hilmi Ünlü
Publisher: Springer
ISBN: 3319253409
Category : Science
Languages : en
Pages : 688
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Book Description
This book focuses on the fundamental phenomena at nanoscale. It covers synthesis, properties, characterization and computer modelling of nanomaterials, nanotechnologies, bionanotechnology, involving nanodevices. Further topics are imaging, measuring, modeling and manipulating of low dimensional matter at nanoscale. The topics covered in the book are of vital importance in a wide range of modern and emerging technologies employed or to be employed in most industries, communication, healthcare, energy, conservation , biology, medical science, food, environment, and education, and consequently have great impact on our society.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 906
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Book Description
Author: Ōsaka Daigaku. Sangyō Kagaku Kenkyūjo
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 416
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Book Description
