Новинка

6201 руб.

The realization of layered and ring shape nano structures, in which radial motion of charge carriers is limited both on inner and on outer borders, has brought a new class of theoretical problems about the physical processes in such systems . The important feature of theoretical description of layered and ring shape structures is the opportunity of realization of limiting transitions to quantum wells, wires and also to quantum dotes of various geometry. Really, if we fix the thickness of cylindrical nano-layer and increase internal and external radii the system becomes similar to quantum well. On the other hand, if we set the height of cylindrical quantum layer to infinity, and vanishes the internal radius we will get a quantum wire with circular cross section. If we fix the height and vanishes only internal radius we will get a cylindrical quantum dot. Thus, the results received for layered and ring shape systems have general character and for this reason cause essential interest.
Новинка

5462 руб.

Four-level rate equation model is used to describe the carrier dynamics in quantum dot (QD) semiconductor optical amplifiers (SOAs) which takes into account the effect of QD continuum state. A phenomenological description is used to model the intradot carrier scattering between discrete quantum dot states and the continuum state. Analytical results are presented for the small-signal response of wavelength conversion based on the four-wave mixing and cross gain modulation in these advanced amplifiers.
Новинка

5576 руб.

This book presents devices which are fabricated using high energy gap ZnyCd1-ySe cladded ZnxCd1-xSe quantum dots (y
Новинка

4468 руб.

In this thesis the interaction between a single quantum dot and a cavity is investigated. Quantum dots embedded in a micropillar cavity are investigated by measuring the spectra, and by performing time-resolved measurements. The enhancement of the spontaneous decay of the quantum dot is measured to 18.9 with a resonant lifetime of 28.1 ps under the assumption of an exponential decay. A model is constructed with measurable parameters, and the calculated decay curves are not exponential. As a result the mean decay rate, which coincides with the exponential rate for an exponential decay, is calculated for the measured rates. A large deviation is seen, with an enhancement of the mean decay rate of 9.1 with a resonant lifetime of 56.5 ps. The non-exponential decay of the quantum dot is caused by non- Markovian processes in the dot-cavity interaction. Furthermore, the second order coherence is measured to determine the quality of the single-photon emission, and two-photon interference measurements are likewise performed. These measurements show an indistinguishability of 48%. Finally, cavity-assisted resonant excitation of a quantum dot with another quantum dot is demonstrated.
Новинка

5576 руб.

Dye-sensitized solar cells (DSSCs) and quantum dot-sensitized solar cells (QDSSCs) are two promising alternative, cost-effective concepts for solar-to-electric energy conversion that have been offered to challenge conventional Si solar cells over the past decade. The goal of this book is to understand the fundamental physics and performance of DSSCs and QDSSCs with improved PCE at the low cost based on rational engineering of TiO2 nanostructures, sensitizers, and electrodes through an integrated experimental and modeling study, including three aspects: (1) Effects of surface treatment and structural modification of photoanode on the performance of DSSCs; (2) The use of earth abundant, environmentally friendly quaternary Copper Zinc Tin Sulfide (CZTS) as a low-cost alternative to noble metal Pt as the counter electrode (CE); (3) Simulation of the light harvesting ability of TiO2 nanotube solar cells coated with CdSe and PbSe QDs and the charge injection at the interfaces of TiO2 substrate and quantum dots.
Новинка

7466 руб.

In this book, novel multi-section laser diodes based on quantum-dot material are designed and investigated which exhibit a number of advantages such as low threshold current density; temperature-insensitivity and suppress carrier diffusion due to discrete nature of density of state of quantum-dots. The spectral versatility in the range of 1.1 ?m – 1.3 ?m wavelengths is demonstrated through novel mode-locking regimes such as dual-wavelength mode-locking, wavelength bistability and broad tunability. Moreover, broad pulse repetition rate tuning using an external cavity configuration is presented. A high peak power of 17.7 W was generated from the quantum-dot laser with the tapered geometry of the gain section of the laser has led to successful application of such device for two-photon imaging. The improved optical parameters of the tapered laser enable to achieve nonlinear images of fluorescent beads. Thus it is for the first time that quantum-dot based compact monolithic device enables to image biological samples using two-photon microscopy imaging technique.
Новинка

455.24 руб.

Model 5646546 Color Deep Pink + White Material Dacron Quantity 1 Piece Shade Of Color Pink Lining Dacron Fold Yes Opening Zipper Other Features Double layer design meet common housing demand; Delicate zipper more durable more smooth; With handle more convenient to carry; The cloth pull head more durable; Along with the package with a small mirror humanized design. Packing List 1 x Cosmetic bag
Новинка

5097 руб.

Most of the currently available infrared photodetectors are of either the mercury cadmium telluride (HgCdTe) or quantum well infrared photodetectors (QWIPs) types. Both of these systems have certain drawbacks that have led to the search for better infrared photodetectors. Quantum dot infrared photodetectors (QDIPs) have been studied theoretically and experimentally, and are expected to surpass HgCdTe infrared photodetectors and QWIPs. Although QDIPs are promising candidates for the next generation infrared photodetectors, there are no reliable theoretical models that describe the performance characteristics of this devices. The purpose of the presented book is to fill some of the gaps by presenting theoretical models to two important parameters of the QDIPs, namely the dark current and the absorption coefficient. The model for the dark current is based on a generalized drift diffusion model while the model for the absorbtion is based on NEGF formulation. The models have shown good agreements with experimental results.
Новинка

4468 руб.

As electronics get increasingly small it becomes critically important to control processes and interactions on the level of single electrons and holes. Ultimately, future generations of electronics may store information in the spins of single confined electrons and holes. Quantum dots provide an ideal material for locally confining these single charges. To control interactions between spins in separate quantum dots, the dots will need to be located close to one another and the coupling between the dots must be turned on and off in situ. Vertically stacked quantum dots provide an ideal test bed for studying these interactions because molecular beam epitaxy techniques allow for precise control over the dimensions and spatial proximity of the dots. Ultimately, however, it will be impossible to access individual QDs in a vertically stacked column. Laterally ordered dots will enable the deposition of electrical gates that can individually control each dot and the coupling between them. In this book we are looking at the fundamental mechanisms of coupling between laterally ordered dots and how the coupling depends on material structure.
Новинка

4631 руб.

An introduction to the operation of quantum-dot cellular automata is presented here. Quantum-dot cellular automata (QCA) is a transistorless computation paradigm that addresses the issues of device density and interconnection. It is explained here how Quantum-Dots are used as basic building blocks for this new technology. Mapping of the existing technology to this new paradigm necessitates bringing in the QCA structures that can perform all logic operations that are executed in the current technology. The basic building blocks of the QCA architecture, such as AND, OR, and NOT are presented. QCA is exploited here to perform quantum computing and classical computing.
Новинка

5097 руб.

Integrated quantum photonics show monolithic waveguide chips to be a promising platform for realizing the next generation quantum optical circuits. This book proposes the implementation of Quantum PageRank, the quantum version of famous Google PageRank, on a photonic waveguide lattice. The book uses the paradigm of Quantum Stochastic Walk for the Quantum PageRank problem. The quantum version of Facebook Graph Search is modeled as a multidimensional quantum search used in generating Quantum PageRank. The book uses the metric Kolmogorov Complexity to detect the eavesdropping in BB84 Quantum Cryptography protocol. The Kolmogorov Complexity is used as an added layer of security on the quantum channel.
Новинка

3547 руб.

Varying-composition, deep-well quantum cascade laser (DW-QCL) structures are proposed to suppress carrier leakage at and above room temperature. The layer compositions of the quantum wells and barriers in the active region differ from those in the extractor/injector regions. These structures are grown by using metal-organic chemical vapor deposition (MOCVD). Fabricated ridge-guide devices, lasing at ~ 4.8 ?m, show ultra-low temperature sensitivity of their electro-optical characteristics by comparison to those of conventional QCLs emitting in the 4.5 - 5.5 ?m wavelength range.
Новинка

4468 руб.

The detection of MWIR (mid wavelength infrared radiation) is the important for industrial, biomedical and military applications. Third- generation high-performance IR FPAs are already an attractive proposition to the IR system designer. They covered such as multicolour (at least two, and maybe more different spectral bands) with the possibility of simultaneous detection in both space and time, and ever larger sizes. A type-II band alignment such that the conduction band of InAs layer is lower than the valence band of GaSb layer. The effective bandgap of these structures can be adjusted from 0.4 eV to values below 0.1 eV by varying the thickness of constituent layers leading to an enormous range of detector cutoff wavelengths (3- 20?m). This book is focused on the various key characteristics the optical (responsivity and detectivity) and electrical (surface leakage & dark current) of infrared detector and proof of concept is demonstrated on infrared P-I-N photodiodes based on InAs/GaSb superlattices with ~8.5 µm cutoff wavelength and bandgap energy ~150 meV operating at 78 K where supression of surface leakage currents is observed.
Новинка

5918 руб.

Self-assembled III-V quantum dots attract intense research interest and effort due to their unique physical properties arising from the three-dimensional confinement of carriers and discrete density of states. Semiconductor III-V quantum-dot laser structures exhibit dramatically improved device performance in comparison with their quantum well counterparts, notably their ultra low threshold current density, less sensitivity to defects and outstanding thermal stability. Therefore, integrating a high-quality quantum-dot laser structure onto silicon-based platform could potentially constitute a hybrid technology for the realization of optical inter-chip communications. This book is devoted to the development of high-performance InAs/GaAs quantum-dot lasers directly grown on silicon substrates and germanium substrates for silicon photonics.
Новинка

4631 руб.

Solar energy is becoming one of the primary sources of energy replacing fossil fuels due to its abundance. Its versatility and environmental friendly have made it one of the most promising renewable sources of energy. Photovoltaic conversion of solar energy from the sun is becoming the primary source of energy replacing the depleting fossil fuel. Modeling of solar cells provides an insight into the operation and better understanding of the ways to improve their efficiency; this could also reduce the physical implementation and the cost for fabrication. The 3 dimensional numerical model for GaAs Quantum Dot solar cell has been developed and presented. This work proposes a better way to improve the efficiency of the solar cell by implementing different size (odd) quantum dots. The QD Model utilizes the Schrodinger Equation and the same is validated using simulator tool, Quantum Dot Lab, and the band gap energy of QD is calculated at different temperatures. The results obtained shows good improvement of the efficiency of the solar cell at different wavelengths of solar spectrum.
Новинка

4468 руб.

When the macroscopic dimension of crystalline material is continuously reduced to a very small size (of the order of few nanometer), dramatic changes in the electronic and vibrational properties of these nano-materials can be observed. Confinement in one, two or three dimensions leads to quantum structures termed as quantum well, quantum wire and quantum dot, respectively. Because of the small size, the bulk material properties change due to the quantum-mechanical effects in such dimensions. The smaller the dimension, the larger is the effective band gap. As a consequence, most of the bulk semiconductor properties such as electronic band structure, linear and nonlinear optical properties, excitonic properties and phonon propagation etc. are drastically changed. Photoluminescence (PL) properties of nanoparticles are found to be dependent on particle size, degree of confinement and excitation energy. This work is predominantly carried out to study the Quantum confinement (QC) induced photoluminescence properties of Silicon nano-particles. theoretical calculations and its lineshape fitting with experimental results were carried out.
Новинка

3274 руб.

Quantum dot Cellular Automata (QCA) is an emerging trend in the field of nanotechnology for digital circuits . It has the potential for attractive features such as faster speed, smaller size and low power consumption than transistor based technology. By taking the advantages of QCA we are able to design interesting computational architectures.Quantum dot is basic element of a QCA cell. It made by creating an island of conductive material surrounded by insulating material.QCA cell is arranged as a square pattern with Four quantum-dots.QCA Cells with dots of 2-nm can be used above room temperature.The operating temperature of QCA Cell is highly dependent on the over all size of the Quantum-Dots.
Новинка

4368 руб.

This book contains design, synthesis, fabrication and testing of optoelectronic devices which are composed of colloidal inorganic semiconductor materials and fabricated by potentially low-cost solution-processing methods. The first part of this book demonstrates a novel fabrication method where colloidal quantum dots (QDs) are self-assembled layer-by-layer into a thin film structure through electrostatic interaction. This process allows precise control of QD thin film thickness by self-assembly and can in principle be applied to a wide range of substrates. Using such QD thin films, photoconductor photodetectors and metal-intrinsic-metal photodiodes have been demonstrated. In the second part of this dissertation, heavy-metal-free colloidal Si materials are synthesized by electrochemical etching Si wafers, followed by surface modification and ultra-sonication for dispersion of Si nano- and/or micro-particles in various solvents. Demonstrated applications include RGB photoluminescent Si phosphors, scattering-enhanced Si nano-/micro-particle composite photodetectors and hybrid Si QD-organic light-emitting-diodes (LEDs).
Новинка

4468 руб.

Over the past decades, the use of surface plasmons (SPs) of noble metal nano-particles to control light emission on the nanometer scale has increased rapidly, due to their field enhancement and other special properties. With this boom in physics, chemistry, biomedical science and engineering has also come a rise in the need for understanding the dynamics of light emission in these systems. Traditional photoluminescence spectrum only gives limited information on quantum dot emission under SP resonances. This book, therefore, uses modern Time-Correlated Single Photon Counting technique and other approaches to study SPs in nanoparticle arrays, and their effects on semiconductor quantum dot emission. The observed SP resonances in metal nano-disc arrays enhances the CdSe/ZnS (core/shell) quantum dot emission in a way that is dependent on dipole emission angle and photon polarization, which is fully explained by quantum electrodynamics. This fundamental finding could be used to control the light emission in plasmonic device applications.
Новинка

4468 руб.

In recent years, progress in nanotechnology has allowed manufacturing of ultra small systems in the areas of electronics and opto-electronics with a high-precision capability of controlling the size and shape. Quantum dots (QD) are typical examples of nanosystems where the electrons are confined in all the 3-dimensions. These quasi-zero-dimensional systems show exotic electronic behaviors typical of the atom like discrete density of states (DOS) of the carriers. QDs could incorporate dopant impurities as a crucial ingredient for their proper functioning. The great interest for understanding the properties of these impurity containing systems comes from the fact that the impurity modifies the energy levels of the materials and in turn affects their electronic and optical properties. So these systems have potential use in electro-optical devices. In this book we explore the excitation kinetics of a repulsive impurity doped quantum dot owing to the time-variation of several impurity parameters e.g. impurity coordinate, impurity domain, and impurity potential. The investigation reveals the sensitivity of the interplay between the above parameters that ultimately shapes the kinetics.
Новинка

7204 руб.

The structural, optical and electrical properties of crystalline silicon quantum dots (SiQDs) are examined for application to silicon based tandem cells. The approach has been to concentrate on all silicon devices by taking advantage of quantum confinement in low-dimensional Si. The book presents the fabrication technique to form Si nanocrystals in an oxide matrix. Structural analysis, using FTIR, micro-Raman spectroscopy, TEM, XRD, and SIM were detailed. It can be noticed that the packing density of Si QDs, correlated to the oxygen content of the silicon rich oxide layer can be control independently. The preliminary results present that a decrease in the oxygen content (x) results in an increased sharpness of the Strokes-mode Raman peak of nc-Si, attributed to an increase in the proportion of crystalline Si because of the increased number of SiQDs. However, the influence of the surface region on the crystallite core intensity scattering becomes dominant, when SiQD size diameter is very small (a > ~3 nm). The present work shows that a decrease in x-content leading to an increase of the SiQD concentration, initially results in the enhancement of the lateral conductivity in the SiQD.
Новинка

7204 руб.

In this book, the design of InGaN LDs structures including multi quantum wells (MQWs) active region device are described and investigated by integrated system engineering technology computer aided design (ISE TCAD) device simulator. The parameters of the LDs structures are varied and optimized for high performance. This optimization study involves aspects such as thickness of active region, doping, thickness of stopper layer region, thickness of quantum wells and quantum barriers, number of quantum wells and several approaches to improve and achieve high efficiency, low threshold current and high output power of InGaN LDs. The basic LDs structures treated here are Fabry–Perot type InGaN double heterostructure (DH), separate confinement heterostructure (SCH) and multi quantum wells (MQWs).High performance LD has been obtained by using multi quantum wells incorporated with the optimized parameters. The lowest threshold current, higher external quantum efficiency and characteristic temperature are obtained when the number of InGaN well layers is two, at our laser emission wavelength of 415 nm, which is related to the problem of inhomogeneous carrier.
Новинка

6374 руб.

This book is on the fundamental studies of electron transport in different 2DEG systems. Electron transport in wide range of GaN samples were studied including in a high carrier density regime where a second conductive subband channel was occupied. The spin-orbit interaction were studied in the GaN heterostructures by using the weak antilocalization measurements. We also studied the energy relaxation processes in the GaN systems to understand the power dissipation. The second topic was electron dynamics on Quantum Hall liquid in GaAs system. We were able to study the Quantum Hall liquids in their deep insulating regime by using single electron transistors. The objective was to understand the charge motions in the quantum Hall liquid in an antidot structure, a particularly important structure for possible device applications in quantum computation. We have also shown that the response associated with the motion of electrons in the bulk of the integer quantum Hall layer could be enhanced by using multiple layers. This finding led us to a magnetometer application which was demonstrated by using a heterostructure with 25 identical multiple quantum wells.
Новинка

3771 руб.

Occupational air pollution with nanoparticles is linked to pulmonary disease. It is therefore necessary to identify the cytotoxic effects of inhaled nanoparticles. This study tested the hypothesis that polyoxometalates and CdS quantum dots are cytotoxic to human lung cells. Therefore, the potential cytotoxic effects of three novel nanoparticles, two polyoxometalates (POM I & POM II) and a CdS quantum dot were investigated using the A549 human lung adenocarcinoma cell line. Cells were exposed to the nanoparticles for 1, 24 and 72 hours and cytotoxicity characterized based on metabolic activity, membrane integrity, cellular morphology and clonogenic cell growth. This was achieved using the MTT assay, the Trypan blue dye exclusion assay, light microscopy and the clonogenic assay, respectively.
Новинка

2179 руб.

Quantum Evolution – The New Science of Life
Новинка

8800 руб.

Кварцевый хронограф. Индикация числа. Корпус выполнен из нержавеющей стали. Каучуковый ремень. Диаметр 47 мм.
Новинка

5987 руб.

Quantum City,
Новинка

1131 руб.

Quantum Lyrics – Poems
Новинка

11520 руб.

Кварцевый хронограф. 12/24 часовой формат отображения времени. Индикатор числа. Корпус выполнен из нержавеющей стали. Полиуретановый ремень. Диаметр корпуса 48,5 мм.
Новинка

10680 руб.

Кварцевый хронограф. Калибр TMI VD53. 12/24 часовой формат отображения времени. Индикатор числа. Корпус выполнен из нержавеющей стали. Полиуретановый ремень. Диаметр корпуса 50 мм.
Новинка

14360 руб.

Кварцевый хронограф. Калибр TMI VD53. 12/24 часовой формат отображения времени. Инди��атор числа. Корпус из нержавеющей стали с розовым PVD покрытием. Силиконовый ремень. Диаметр корпуса 50 мм.
Новинка

1985 руб.

Quantum Lyrics – Poems
Новинка

4230 руб.

Quantum Mechanics Simulations
Новинка

Новинка

2258 руб.

Quantum Mechanics & Experience (Paper)
Новинка

2064 руб.

Quantum Theory, Black Holes and Inflation
Новинка

Новинка

8800 руб.

Кварцевый хронограф. 12/24 часовой формат отображения времени. Индикатор числа. Корпус выполнен из нержавеющей стали с PVD покрытием. Полиуретановый ремень. Диаметр корпуса 45 мм.
Новинка

19160 руб.

Кварцевый хронограф. 12/24 часовой формат отображения времени. Индикатор числа. Корпус из нержавеющей стали с PVD покрытием. Полиуретановый ремень. Диаметр корпуса 48,5 мм.
Новинка

6960 руб.

Кварцевые часы. Циферблат украшен кристаллами Swarovski. Сапфировое стекло. Корпус и браслет выполнены из нержавеющей стали с PVD покрытием. Диаметр корпуса 38 мм.
Новинка

11520 руб.

Кварцевый хронограф. 12/24 часовой формат отображения времени. Индикатор числа. Корпус выполнен из нержавеющей стали с PVD покрытием. Полиуретановый ремень. Диаметр корпуса 48,5 мм.
Новинка

2995 руб.

Quantum Mechanics V2 – Maser Amplifiers and Oscellators
Новинка

Новинка

Новинка

5097 руб.

The most interesting idea associated with composite quantum systems is quantum entanglement which is a fundamental resource in quantum information processing. Quantum entanglement has been widely observed within the framework of quantum optical systems such as in cavity quantum electrodynamics. The generation of various types of entanglement and its characteristic properties via direct or indirect atom-photon interactions have been studied in this book.
Новинка

3393 руб.

Achieving lower dimensional electronic device in today’s world has been increased enormously. Miniaturization technique has been improved in connection to maintain noble device properties. Processes incorporated to nano range fabrication are always intricate, as various quantum size effects play important role in this regime. Understanding the physics of low-dimensional systems and the operation of next-generation electronics will be helpful in bringing revolutionary changes to mankind. Phenomena surrounding the nanoparticles have been discussed and the discussion has been divided into two broad categories: synthesis and characterization of the nanoparticles embedded MOS capacitor. Capacitance peaks in the inversion region due to carrier tunneling into the quantum dot and Coulomb blockade charging in quantum dot has been observed, which elucidated the charge storing phenomena of nanoparticles.
Новинка

Новинка

7772 руб.

Quantum Mechanics Non-Relativistic Theory,
Новинка

21990 руб.

Устройство с резонирующей катушкой, предназначенное для усиления эффекта Nordost Quantum Qv2. Карбоновый корпус. Эффект возрастает с количеством используемых устройств.
Новинка

2056 руб.

Elementary Quantum Mechanics in One Dimension
Новинка

5979 руб.

Elementary Quantum Mechanics in One Dimension
Новинка

22600 руб.

Кварцевый хронограф. 12/24 часовой формат отображения времени. Индикатор числа. Корпус из нержавеющей стали. Силиконовый ремень. Диаметр корпуса 51 мм.
Новинка

18680 руб.

Кварцевый хронограф. 12/24 часовой формат отображения времени. Индикатор числа. Корпус из нержавеющей стали с PVD покрытием. Полиуретановый ремень. Диаметр корпуса 48,5 мм.
Новинка

9560 руб.

Кварцевый хронограф. Калибр TMI VD53. 12/24 часовой формат отображения времени. Индикатор числа. Корпус из нержавеющей стали с розовым PVD покрытием. Кожаный ремень. Диаметр корпуса 46 мм. In this thesis the interaction between a single quantum dot and a cavity is investigated. Quantum dots embedded in a micropillar cavity are investigated by measuring the spectra, and by performing time-resolved measurements. The enhancement of the spontaneous decay of the quantum dot is measured to 18.9 with a resonant lifetime of 28.1 ps under the assumption of an exponential decay. A model is constructed with measurable parameters, and the calculated decay curves are not exponential. As a result the mean decay rate, which coincides with the exponential rate for an exponential decay, is calculated for the measured rates. A large deviation is seen, with an enhancement of the mean decay rate of 9.1 with a resonant lifetime of 56.5 ps. The non-exponential decay of the quantum dot is caused by non- Markovian processes in the dot-cavity interaction. Furthermore, the second order coherence is measured to determine the quality of the single-photon emission, and two-photon interference measurements are likewise performed. These measurements show an indistinguishability of 48%. Finally, cavity-assisted resonant excitation of a quantum dot with another quantum dot is demonstrated.