epitaxial growth and electronic structure of self assembled quantum dots

... Least-Squares Estimator US United States of America ix Abstract This thesis is comprised of three essays on the credit growth and banking structure of the Central and Eastern European Countries (CEE) ... Credit Growth in Central and Eastern European Countries, studies the importance of bank ownership structure for the growth of credit in the CEE countries The foreign bank ownership for the credit growth ... time in terms of profitability, efficiency, and liquidity ratios The sign and the significance level for a majority of micro and macro level variables change between the 1990s and the 2000s The...

Ngày tải lên: 03/06/2014, 02:21

... PbTe matrix The aim of this research is to check how introducing nanostructures of different size and shape changes DOS of the carriers near the Fermi level Model nanostructures and calculation method ... NWs (A-NWs) and the matrix are of {110} and {001} type The same two types of planes and the {111} planes form the interfaces of the A-QD As shown already in Ref [12], the energies of all these ... the top of the valence band (in p-type) or the bottom of the conduction band (in n-type) To check how introducing nanostructures of different size and shape changes DOS of the carriers near the...

Ngày tải lên: 21/06/2014, 05:20

... g-factors of the different layers, the resonant and non-resonant tunneling processes, the capture dynamics of the carriers by the QDs, the density of carriers along the structure and the Zeeman and ... spinsplitting of the QD states under magnetic field and it depends on the spin polarization of the injected carriers into the QW, which are determined by the g-factors and the density of electrons and ... The potential profile of our structure should then be changed with respect to a reference sample without quantum dots [8,9] In this case, an asymmetry in the impurity concentration of the contact...

Ngày tải lên: 21/06/2014, 05:20

... morphology and growth temperature We show that the formation of SiNWs is indeed closely related to the amorphous SiO particles, and the growth and self- assembling process of SiNWs on the surface of SiO ... made of a Si core and a SiO2 sheath The one-dimensional growth of SiNWs is facilitated by the SiO2 sheath that con®nes the lateral growth of SiNWs, and the high absorptivity for Si±O clusters of ... previously [8] but with a growth time of 10 The short synthesis time was used so as to study the initial stage of SiNW growth Results and discussions Fig shows the SEM images of SiNWs and particles on...

Ngày tải lên: 16/03/2014, 15:06

... particles is facilitated and followed by the growth of 1D nanorods to form the urchin-like structure TEM and HR-TEM micrographs of h-WO3 nanostructures formed using Na+ ion- and NH4 + ion-based EDTA ... hierarchical nanostructure was confirmed by XRD and TEM analyses SEM and TEM images revealed self- assembled nanowire bundles and nanorods that formed urchin-like structures The shapes of the hWO3 nanowire ... ligand (EDTA) is not only needed to form a stable complex with W6+ , but also the ligand binds to the surface of the crystal, which directly affects the growth direction and crystal structure of...

Ngày tải lên: 19/03/2014, 16:48

... National Institute of Standards and Technology nor does it imply that these are the best for the purpose Author details Department of Mechanical Engineering, University of Maryland, College Park, ... Thermal conductivity and viscosity of selfassembled alcohol/polyalphaolefin nanoemulsion fluids Nanoscale Research Letters 2011 6:274 Page of Submit your manuscript to a journal and benefit from: ... conceived of the study, provided instruction on the experiment, and drafted the manuscript BH performed the SANS measurement and assisted in data processing and analysis All authors read and approved...

Ngày tải lên: 21/06/2014, 04:20

... 3.5 Regression of plot growth with leaf biomass, phenological structure, and other plot structures Regression analysis revealed that gross growth depended positively on LB1 and LB2, and negatively ... LB1 and LB2, although the effect of LB2 was not significant and depended positively on plot stem density and BA (P < 0.05; Tab II) Effect of leaf biomass and phenological structure on plot growth ... In undisturbed stands, leaf biomass is often proportional to BA [23], so the effects of leaf biomass and BA on stand growth cannot be distinguished by regression even if stand growth is determined...

Ngày tải lên: 07/08/2014, 16:20

... understanding of heteroepitaxial behavior of Bi and help to understand the surface interaction which may not occur for bulk materials On the other hand, the study of the electronic structures of self- assembled ... present the results of our in situ STM study of the growth and morphologies of Bi nanobelts (nanoribbons) and thin films on MoS2(0001) and STS study of electronic structures of Bi nanobelts on ... smaller structures The following sub-sections provide an overview of motivation and synopsis of this PHD project, and a general introduction of surfaces/interfaces, thin film growth and self- assembly...

Ngày tải lên: 11/09/2015, 10:16

... on top of carbon atoms of the second layer, whereas the carbon atoms in black are located above the center of the six-fold carbon rings of the second layer [4] Fig 1.1 Crystal structure of HOPG ... arrangement of carbon atoms being strongly covalently bonded to one another The neighboring layers are shifted and result in ABAB stacking sequence 1.1.2 Electronic Structure of Graphite STM studies of ... possible interactions between adsorbates and substrates will not involve fairly intricate processes 1.2 Self- Assembled Monolayers (SAMs) The concept of the self- assembled monolayers (SAMs) is primarily...

Ngày tải lên: 14/09/2015, 08:37

... STM The size, shape and chemical identity of the tip influence not only the resolution and shape of an STM scan, but also the measured electronic structure The microstructure of the tip is the ... automatic cutoff circuit is used to cut off the potential to avoid over-etching The cutoff time of the etching has a significant effect on the radius of curvature of the tip: the faster the cutoff time, ... modification of a surface and for the manipulation of atoms and molecules through tip sample interactions, opening up the prospects of constructing atomic or molecular scale devices 2.1.1 Principle of...

Ngày tải lên: 14/09/2015, 08:37

... production and detection of sound, generation of high voltages, electronic frequency generation, microbalance, and ultra fine focusing of optical assemblies It is also the basis of operation of the ... microscope, such as STM and AFM Scanner serve as the “movers and shakers” of every scanning probe microscope 39 CALIBRATION Typically, they consist of a hollow tube made of piezoelectric material ... stationary and the tip is moved The different scanners not react exactly the same to a voltage Because of slight variations in the orientation and size of the piezoelectric granular structure...

Ngày tải lên: 14/09/2015, 08:37

... lattice structure of the underlying graphite surface lattice The image of heneicosanoic acid monolayers and image of HOPG were put in same picture In Fig 4.3 the upper quarter is the STM image of ... PHYSISORPTION OF BINARY FATTY ACIDS ON HOPG formed by binary mixture of CH3(CH2)19COOH and CH3(CH2)22COOH with weight ratio of 2:1 is shown in Fig 4.6 Fig 4.6 STM image of a monolayer formed of heneicosanoic ... orientation of first adsorbed alkyl group on HOPG surface (top view): The dark lines on the left hand side and middle of the picture are step and adsorbate respectively The honeycomb structure...

Ngày tải lên: 14/09/2015, 08:37

... height of 0.2 nm (Fig 5.3) Fig 5.3 The height profile of the DDPER Self- Assembled Monolayers 78 FORMATION OF SAMs CONRTOLLED BY STERIC EFFECTS In conclusion, the DDPER molecules form stable self- assembled ... enlarged image of the DDPER monolayers structure within section A It is noticed that the submolecular structure and the substituents of the molecules were not very well resolved The center of the DDPER ... STM results of the Self- Assembled Monolayers During experiments, each sample was treated in the same way to minimize the disturbance from environment and instruments The details of the experimental...

Ngày tải lên: 14/09/2015, 08:37

... STM image of two types of SAMs arrangement and their boundary Bottom: The surface plot of the STM image (current profile) The height of each pinnacle is proportional to the magnitude of current ... appearances of HBB under STM are different for molecules on the left hand side and right hand side of the boundary (in black, Fig 6.7) The observation strongly suggested the ‘internal’ structures of molecules ... part and the right part are apparent as shown in Fig 6.6: (i) the alignment of the individual molecules within the rows and (ii) different ‘internal’ structure of the molecules Further studies of...

Ngày tải lên: 14/09/2015, 08:37

... Proposed process of formation of the 2D crystals The theory of growth of perfect crystals has been well developed For the growth of a three dimensional crystal, it mainly occurs at steps of monomolecular ... classes of 2D structures based on the dependence of the adatoms’ period to the period of the substrate One is the commensurate structure with periods that are multiples of the substrate period, and ... equilibrium constant of reaction (7-3) 7.4.2 The surface structure of HOPG and [N] [N] is the density of the kinks on the step of the graphite crystal surface which is the nature of the graphite crystal...

Ngày tải lên: 14/09/2015, 08:37

... control of epitaxial thickness offered by MBE and MOCVD The complexity and relatively poorer understanding of the MBE and MOCVD systems result in longer setup time and downtime for maintenance and ... LPE GROWTH AND FABRICATION OF GAP GREEN LEDS page EPITAXIAL TECHNOLOGIES the underlying crystal structure VPE is generally a slow growth process, normally of the order of 20-30µm/h, the growth ... simpler and more developed LPE technology The LPE GROWTH AND FABRICATION OF GAP GREEN LEDS page 14 EPITAXIAL TECHNOLOGIES cost of setting up and running MBE and MOCVD systems is in the order of millions...

Ngày tải lên: 10/11/2015, 11:00

... Risk and Term Structure of Interest Rates • The risk structure of interest rates looks at bonds with the same term to maturity and different interest rates • The term structure of interest ... over the life of the long-term bond • Buyers of bonds not prefer bonds of one maturity over another; they will not hold any quantity of a bond if its expected return is less than that of another ... determined by the demand for and supply of that bond • Investors have preferences for bonds of one maturity over another • If investors have short desired holding periods and generally prefer...

Ngày tải lên: 05/01/2014, 16:56

... route to SCD children with growth retardation (weight and height ,5th centile) led to a rapid and sustained increase in growth and a reduction of pain crises and episodes of infection.15 The authors ... the pattern of height and weight, and time of menarche correlated well with weight and age Height and weight impairment at all ages and in both sexes compared with published growth reference values ... in boys and 0.6 years in girls By the age of 8, this had increased to and 1.3 years in boys and girls, respectively Children with SC disease showed no growth deficit.32 The time of the growth...

Ngày tải lên: 12/02/2014, 19:20

Ngày tải lên: 15/02/2014, 17:20

... a ratio of : : 0.01 (v/v/v) and sprayed at a flow rate of lLÆmin)1 MALDI-TOF MS of LPS and free lipid A were performed on a Reflex III (Bruker-Daltonik, Bremen, Germany) in the linear TOF configuration ... C18:0, C20:0 and 3-OH-C20:0 MALDI-MS and ESI-MS analysis As a first step in the structural analysis, LPS and de-Oacylated LPS of C trachomatis serotype E was analyzed by MALDI-TOF and ESI-FT-ICR ... spectra of LPS samples obtained from C trachomatis serotype L2 and Chl psittaci strain 6BC, the chemical structures of which are already known [12,13] The negative ion MALDI-TOF mass spectrum of the...

Ngày tải lên: 20/02/2014, 23:20