scholarly journals Simple theoretical analysis of the photoemission from quantum confined effective mass superlattices of optoelectronic materials

2011 ◽  
Vol 2 ◽  
pp. 339-362 ◽  
Author(s):  
Debashis De ◽  
Sitangshu Bhattacharya ◽  
S M Adhikari ◽  
A Kumar ◽  
P K Bose ◽  
...  
Keyword(s):  
Light Intensity ◽  
Effective Mass ◽  
Quantum Wires ◽  
Strong Dependence ◽  
Energy Spectra ◽  
Optoelectronic Materials ◽  
Magnetic Quantization ◽  
Light Waves ◽  
Carrier Energy ◽  
Low Dimensional

The photoemission from quantum wires and dots of effective mass superlattices of optoelectronic materials was investigated on the basis of newly formulated electron energy spectra, in the presence of external light waves, which controls the transport properties of ultra-small electronic devices under intense radiation. The effect of magnetic quantization on the photoemission from the aforementioned superlattices, together with quantum well superlattices under magnetic quantization, has also been investigated in this regard. It appears, taking HgTe/Hg1− x Cd x Te and In x Ga1− x As/InP effective mass superlattices, that the photoemission from these quantized structures is enhanced with increasing photon energy in quantized steps and shows oscillatory dependences with the increasing carrier concentration. In addition, the photoemission decreases with increasing light intensity and wavelength as well as with increasing thickness exhibiting oscillatory spikes. The strong dependence of the photoemission on the light intensity reflects the direct signature of light waves on the carrier energy spectra. The content of this paper finds six different applications in the fields of low dimensional systems in general.

LOW-DIMENSIONAL ELECTRONIC STATES AT METAL SURFACES: QUANTUM WELLS AND QUANTUM WIRES

1995 ◽  
Vol 02 (01) ◽  
pp. 81-88 ◽  
Author(s):  
F.J. HIMPSEL
Keyword(s):  
Quantum Wells ◽  
Giant Magnetoresistance ◽  
Quantum Wires ◽  
Magnetic Coupling ◽  
Magnetic Multilayers ◽  
Atomic Scale ◽  
Level Shifts ◽  
Stepped Surface ◽  
Low Dimensional ◽  
Step Edges

Several possibilities of “engineering” low-dimensional solids on the atomic scale are discussed. The electronic and magnetic structure of such materials is explored for two classes, i.e., multilayers and “wires” attached to step edges. Magnetic multilayers represent a particularly promising case, since quantum effects have macroscopic consequences. Quantization perpendicular to the layers is connected with oscillatory magnetic coupling, which in turn is important for obtaining “giant” magnetoresistance. This effect is being applied towards the fabrication of magnetoresistive reading heads for magnetically stored data. Extensions towards lateral superlattices and quantum wires are explored, where a stepped surface acts as a template. It is found that electrons can be trapped at step edges, and level shifts of the order 0.5 eV are observed for atoms adsorbed at step edges.

The Oxford Handbook of Small Superconductors

2017 ◽  
Keyword(s):  
Quantum Wires ◽  
Superconducting Devices ◽  
Basic Research ◽  
Spectroscopic Studies ◽  
Current Status ◽  
Great Promise ◽  
Surface And Interface ◽  
Technological Advances ◽  
Mesoscopic Superconductors ◽  
Low Dimensional

This handbook examines cutting-edge developments in research and applications of small or mesoscopic superconductors, offering a glimpse of what might emerge as a giga world of nano superconductors. Contributors, who are eminent frontrunners in the field, share their insights on the current status and great promise of small superconductors in the theoretical, experimental, and technological spheres. They discuss the novel and intriguing features and theoretical underpinnings of the phenomenon of mesoscopic superconductivity, the latest fabrication methods and characterization tools, and the opportunities and challenges associated with technological advances. The book is organized into three parts. Part I deals with developments in basic research of small superconductors, including local-scale spectroscopic studies of vortex organization in such materials, Andreev reflection and related studies in low-dimensional superconducting systems, and research on surface and interface superconductivity. Part II covers the materials aspects of small superconductors, including mesoscopic effects in superconductor–ferromagnet hybrids, micromagnetic measurements on electrochemically grown mesoscopic superconductors, and magnetic flux avalanches in superconducting films with mesoscopic artificial patterns. Part III reviews the current progress in the device technology of small superconductors, focusing on superconducting spintronics and devices, barriers in Josephson junctions, hybrid superconducting devices based on quantum wires, superconducting nanodevices, superconducting quantum bits of information, and the use of nanoSQUIDs in the investigation of small magnetic systems.

scholarly journals Impact of Band Nonparabolicity on Threshold Voltage of Nanoscale SOI MOSFET

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Yasuhisa Omura
Keyword(s):  
Effective Mass ◽  
Conduction Band ◽  
Threshold Voltage ◽  
Mathematical Formulation ◽  
Electron System ◽  
Band Model ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Low Dimensional ◽  
Band Nonparabolicity

This paper reconsiders the mathematical formulation of the conventional nonparabolic band model and proposes a model of the effective mass of conduction band electrons including the nonparabolicity of the conduction band. It is demonstrated that this model produces realistic results for a sub-10-nm-thick Si layer surrounded by an SiO2layer. The major part of the discussion is focused on the low-dimensional electron system confined with insulator barriers. To examine the feasibility of our consideration, the model is applied to the threshold voltage of nanoscale SOI FinFETs and compared to prior experimental results. This paper also addresses a model of the effective mass of valence band holes assuming the nonparabolic condition.

Optical properties in fractional‐layer‐superlattice quantum wires calculated by multi‐band effective mass theory

1995 ◽  
Vol 77 (7) ◽  
pp. 3372-3377 ◽  
Author(s):  
Hiroaki Ando ◽  
Arturo Chavez‐Pirson ◽  
Hisao Saito ◽  
Hiroshi Kanbe
Keyword(s):  
Optical Properties ◽  
Effective Mass ◽  
Quantum Wires ◽  
Multi Band

Eigen function and corresponding eigen values of charge carriers in V-grooves quantum wires with variable width

2016 ◽  
Vol 30 (17) ◽  
pp. 1650103
Author(s):  
Ali Hossein Mohammad Zaheri
Keyword(s):  
Effective Potential ◽  
Quantum Wire ◽  
Quantum Wires ◽  
Wave Functions ◽  
Charge Carriers ◽  
Energy Spectra ◽  
Eigen Value ◽  
Eigen Values ◽  
Interface Geometry ◽  
Good Agreement

In this work, we have calculated analytically the energy spectra of electrons and holes in V-grooves quantum wires. To modify wire structure, we have used the equations which suggested in the work of Inoshita et al. We introduce a new effective potential scheme which is applicable and matchable with actual interface geometry of this groove of ridge quantum wires. By applying this effective potential and considering a suitable transformed coordinate that allows the decoupling of the two-dimensional wave functions, we have calculated eigen values of the charge carriers in three states as well as the wave functions. We found that by increasing the curvature at the top of quantum wire [Formula: see text] the energy eigen value decreases. Our results are in good agreement with the earlier investigations.

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