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“Dielectric mismatch effect on shallow impurity states in a semiconductor nanowire”. Li B, Slachmuylders AF, Partoens B, Magnus W, Peeters FM, Physical review : B : condensed matter and materials physics 77, 115335 (2008). http://doi.org/10.1103/PhysRevB.77.115335
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 24
DOI: 10.1103/PhysRevB.77.115335
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“Dirac and Klein-Gordon particles in one-dimensional periodic potentials”. Barbier M, Peeters FM, Vasilopoulos P, Milton Pereira J, Physical review : B : condensed matter and materials physics 77, 115446 (2008). http://doi.org/10.1103/PhysRevB.77.115446
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 191
DOI: 10.1103/PhysRevB.77.115446
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“Direct observation of nanometer-scale pinning sites in (Nd0.33Eu0.20Gd0.47)Ba2Cu3O7-\delta single crystals”. Das P, Koblischka MR, Turner S, Van Tendeloo G, Wolf T, Jirsa M, Hartmann U, Europhysics letters 83, 37005 (2008). http://doi.org/10.1209/0295-5075/83/37005
Abstract: We report on the observation of self-organized stripe-like structures on the as-grown surface and in the bulk of (Nd,Eu,Gd)Ba2Cu3Oy single crystals. The periodicity of the stripes on the surface lies between 500800 nm. These are possibly the growth steps of the crystal. Transmission electron microscopy investigations revealed stripes of periodicity in the range of 2040 nm in the bulk. From electron back scattered diffraction investigations, no crystallographic misorientation due to the nanostripes has been found. Scanning tunneling spectroscopic experiments revealed nonsuperconducting regions, running along twin directions, which presumably constitute strong pinning sites.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.957
Times cited: 5
DOI: 10.1209/0295-5075/83/37005
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“Direction-dependent tunneling through nanostructured magnetic barriers in graphene”. Masir MR, Vasilopoulos P, Matulis A, Peeters FM, Physical review : B : condensed matter and materials physics 77, 235443 (2008). http://doi.org/10.1103/PhysRevB.77.235443
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 212
DOI: 10.1103/PhysRevB.77.235443
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“Domain coexistence of magnetism and superconductivity : appearance of confined vortex loops”. Doria MM, de Romaguera ARC, Milošević, MV, Peeters FM, Journal of physics : conference series 97, 012070 (2008). http://doi.org/10.1088/1742-6596/97/1/012070
Abstract: A magnetic moment inside an extreme type II superconductor can have three, but not one or two, confined vortex loops near to the core. For a sub-micron superconducting particle the confined vortex loops eventually break up and reach the surface turning into external vortex pairs.
Keywords: P1 Proceeding; Condensed Matter Theory (CMT)
DOI: 10.1088/1742-6596/97/1/012070
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“The dominant role of impurities in the composition of high pressure noble gas plasmas”. Martens T, Bogaerts A, Brok WJM, van Dijk J, Applied physics letters 92, 041504 (2008). http://doi.org/10.1063/1.2839613
Keywords: A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Impact Factor: 3.411
Times cited: 115
DOI: 10.1063/1.2839613
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“Dynamics of nanoclustering in Te+ implanted Si after application of high frequency electromagnetic field and thermal annealing”. Kalitzova M, Lebedev OI, Zollo G, Gesheva K, Vlakhov E, Marinov Y, Ivanova T;, Applied physics A : materials science &, processing 91, 515 (2008). http://doi.org/10.1007/s00339-008-4441-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.455
DOI: 10.1007/s00339-008-4441-2
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“Dynamics of periodic anticrossings: decoherence, pointer states, and hysteresis curves”. Földi P, Benedict MG, Peeters FM, Physical review : A : atomic, molecular and optical physics 77, 013406 (2008). http://doi.org/10.1103/PhysRevA.77.013406
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 2.925
Times cited: 10
DOI: 10.1103/PhysRevA.77.013406
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“Effect of a metallic gate on the energy levels of a shallow donor”. Slachmuylders AF, Partoens B, Peeters FM, Magnus W, Applied physics letters 92, 083104 (2008). http://doi.org/10.1063/1.2888742
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.411
Times cited: 14
DOI: 10.1063/1.2888742
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“The effect of dielectric mismatch on excitons and trions in cylindrical semiconductor nanowires”. Slachmuylders A, Partoens B, Magnus W, Peeters FM, Journal of computational electronics (2008). http://doi.org/10.1007/s10825-008-0216-4
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 1.526
Times cited: 2
DOI: 10.1007/s10825-008-0216-4
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“Effect of temperature on the 002 electron structure factor and its consequence for the quantification of ternary and quaternary III-V crystals”. Titantah JT, Lamoen D, Schowalter M, Rosenauer A, Springer proceedings in physics 120, 189 (2008)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
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“The effect of the dielectric mismatch on excitons and trions in freestanding nanowires”. Slachmuylders AF, Partoens B, Magnus W, Peeters FM, Physica. E: Low-dimensional systems and nanostructures 40, 2166 (2008). http://doi.org/10.1016/j.physe.2007.10.091
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 2.221
Times cited: 3
DOI: 10.1016/j.physe.2007.10.091
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“Effect of transport of growing nanoparticles on capacitively coupled rf discharge dynamics”. Schweigert IV, Alexandrov AL, Ariskin DA, Peeters FM, Stefanović, I, Kovačević, E, Berndt J, Winter J, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics 78, 026410 (2008). http://doi.org/10.1103/PhysRevE.78.026410
Abstract: We present experimental and numerical studies of the properties of a capacitively coupled 13.56 MHz discharge in a mixture of Ar and C2H2 with growing nanosize particles. It is found that at the initial stage of the growth, nanoparticles are accumulated near the sheath-plasma boundaries, where the ionization by electrons is maximal. The nanoparticles suppress the ionization due to the absorbing fast electrons and stimulate a quick change of the plasma parameters followed by a transition between different modes of discharge operation. At that moment the peaked distribution of the dust particles transforms into a flat one.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 2.366
Times cited: 36
DOI: 10.1103/PhysRevE.78.026410
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“Effects of lateral asymmetry on electronic structure of strained semiconductor nanorings in a magnetic field”. Milošević, MM, Tadić, M, Peeters FM, Nanotechnology 19 (2008). http://doi.org/10.1088/0957-4484/19/45/455401
Abstract: The influence of lateral asymmetry on the electronic structure and optical transitions in elliptical strained InAs nanorings is analyzed in the presence of a perpendicular magnetic field. Two-dimensional rings are assumed to have elliptical inner and outer boundaries oriented in mutually orthogonal directions. The influence of the eccentricity of the ring on the energy levels is analyzed. For large eccentricity of the ring, we do not find any AharonovBohm effect, in contrast to circular rings. Rather, the single-particle states of the electrons and the holes are localized as in two laterally coupled quantum dots formed in the lobes of the nanoring. Our work indicates that the control of shape is important for the existence of the AharonovBohm effect in semiconductor nanorings.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.44
Times cited: 11
DOI: 10.1088/0957-4484/19/45/455401
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“Electrical switching in Fe/Cr/MgO/Fe magnetic tunnel junctions”. Halley D, Majjad H, Bowen M, Najjari N, Henry Y, Ulhaq-Bouillet C, Weber W, Bertoni G, Verbeeck J, Van Tendeloo G, Applied physics letters 92, 212115 (2008). http://doi.org/10.1063/1.2938696
Abstract: Hysteretic resistance switching is observed in epitaxial Fe/Cr/MgO/Fe magnetic tunnel junctions under bias voltage cycling between negative and positive values of about 1 V. The junctions switch back and forth between high- and low-resistance states, both of which depend on the device bias history. A linear dependence is found between the magnitude of the tunnel magnetoresistance and the crafted resistance of the junctions. To explain these results, a model is proposed that considers electron transport both by elastic tunneling and by defect-assisted transmission. (c) 2008 American Institute of Physics.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.411
Times cited: 33
DOI: 10.1063/1.2938696
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“Electron-vortex separation in quantum dots”. Anisimovas E, Tavernier MB, Peeters FM, Physical review : B : condensed matter and materials physics 77, 045327 (2008). http://doi.org/10.1103/PhysRevB.77.045327
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 3
DOI: 10.1103/PhysRevB.77.045327
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“Electronic states above a helium film suspended on a ring-shaped substrate”. Ramos ACA, Chaves A, Farias GA, Peeters FM, Physical review : B : condensed matter and materials physics 77, 045415 (2008). http://doi.org/10.1103/PhysRevB.77.045415
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 4
DOI: 10.1103/PhysRevB.77.045415
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“An emission-potential multislice approximation to simulate thermal diffuse scattering in high-resolution transmission electron microscopy”. Rosenauer A, Schowalter M, Titantah JT, Lamoen D, Ultramicroscopy 108, 1504 (2008). http://doi.org/10.1016/j.ultramic.2008.04.002
Abstract: Thermal diffuse scattered electrons significantly contribute to high-resolution transmission electron microscopy images. Their intensity adds to the background and is peaked at positions of atomic columns. In this paper we suggest an approximation to simulate intensity of thermal diffuse scattered electrons in plane-wave illumination transmission electron microscopy using an emission-potential multislice algorithm which is computationally less intensive than the frozen lattice approximation or the mutual intensity approach. Intensity patterns are computed for Au and InSb for different crystal orientations. These results are compared with intensities from the frozen lattice approximation based on uncorrelated vibration of atoms as well as with the frozen phonon approximation for Au. The frozen phonon method uses a detailed phonon model based on force constants we computed by a density functional theory approach. The comparison shows that our suggested emission-potential method is in close agreement with both the frozen lattice and the frozen phonon approximations.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.843
Times cited: 25
DOI: 10.1016/j.ultramic.2008.04.002
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“Enhanced stability against oxidation due to 2D self-organisation of hcp cobalt nanocrystals”. Lisiecki I, Turner S, Bals S, Pileni MP, Van Tendeloo G Springer, Berlin, page 273 (2008).
Keywords: H1 Book chapter; Electron microscopy for materials research (EMAT)
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“Enhancing total conductivity of La2NiO4+\delta epitaxial thin films by reducing thickness”. Burriel M, Santiso J, Rossell MD, Van Tendeloo G, Figueras A, Garcia G, The journal of physical chemistry: C : nanomaterials and interfaces 112, 10982 (2008). http://doi.org/10.1021/jp7101622
Abstract: High quality epitaxial c axis oriented La2NiO4+ä thin films have been prepared by the pulsed injection metal organic chemical vapor deposition technique on different substrates. High-resolution electron microscopy/transmission electron microscopy has been used to confirm the high crystalline quality of the deposited films. The c-parameter evolution has been studied by XRD as a function of time and gas atmosphere. The high temperature transport properties along the basal a−b plane of epitaxial La2NiO4+ä films have been measured, and the total conductivity of the layers has been found to increase as the thickness is reduced. Layers of 50 nm and thinner have shown a maximum conductivity larger than that measured for single-crystals, in particular, the 33 nm thick films with a conductivity of 475 S/cm in oxygen correspond to the highest value measured to date for this material.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 4.536
Times cited: 35
DOI: 10.1021/jp7101622
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“Exciton spectra in vertical stacks of triple and quadruple quantum dots in an electric field”. Szafran B, Barczyk E, Peeters FM, Bednarek S, Physical review : B : condensed matter and materials physics 77, 115441 (2008). http://doi.org/10.1103/PhysRevB.77.115441
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 25
DOI: 10.1103/PhysRevB.77.115441
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“Excitons and trions in cylindrical nanowires with dielectric mismatch”. Slachmuylders AF, Partoens B, Magnus W, Peeters FM, Physica status solidi: C: conferences and critical reviews 5, 2416 (2008). http://doi.org/10.1002/pssc.200777650
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Times cited: 3
DOI: 10.1002/pssc.200777650
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“First-principles study of doped Si and Ge nanowires”. Peelaers H, Partoens B, Peeters FM, Physica. E: Low-dimensional systems and nanostructures 40, 2169 (2008). http://doi.org/10.1016/j.physe.2007.10.090
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 2.221
Times cited: 7
DOI: 10.1016/j.physe.2007.10.090
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“First-principles study of transition metal impurities in Si”. Zhang Z, Partoens B, Chang K, Peeters FM, Physical review : B : condensed matter and materials physics 77, 155201 (2008). http://doi.org/10.1103/PhysRevB.77.155201
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.836
Times cited: 72
DOI: 10.1103/PhysRevB.77.155201
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“Flow analyses in the lower airways: patient-specific model and boundary conditions”. de Backer JW, Vos WG, Gorlé, CD, Germonpré, P, Partoens B, Wuyts FL, Parizel PM, de Backer W, Medical engineering and physics 30, 872 (2008). http://doi.org/10.1016/j.medengphy.2007.11.002
Abstract: Computational fluid dynamics (CFD) is increasingly applied in the respiratory domain. The ability to simulate the flow through a bifurcating tubular system has increased the insight into the internal flow dynamics and the particular characteristics of respiratory flows such as secondary motions and inertial effects. The next step in the evolution is to apply the technique to patient-specific cases, in order to provide more information about pathological airways. This study presents a patient-specific approach where both the geometry and the boundary conditions (BC) are based on individual imaging methods using computed tomography (CT). The internal flow distribution of a 73-year-old female suffering from chronic obstructive pulmonary disease (COPD) is assessed. The validation is performed through the comparison of lung ventilation with gamma scintigraphy. The results show that in order to obtain agreement within the accuracy limits of the gamma scintigraphy scan, both the patient-specific geometry and the BC (driving pressure) play a crucial role. A minimal invasive test (CT scan) supplied enough information to perform an accurate CFD analysis. In the end it was possible to capture the pathological features of the respiratory system using the imaging and computational fluid dynamics techniques. This brings the introduction of this new technique in the clinical practice one step closer.
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Antwerp Surgical Training, Anatomy and Research Centre (ASTARC); Laboratory Experimental Medicine and Pediatrics (LEMP)
Impact Factor: 1.819
Times cited: 82
DOI: 10.1016/j.medengphy.2007.11.002
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“Formation of a complete solid solution between the triphylite and fayalite olivine structures”. Recham N, Casas-Cabanas M, Cabana J, Grey CP, Jumas J-C, Dupont L, Armand M, Tarascon J-M, Chemistry of materials 20, 6798 (2008). http://doi.org/10.1021/cm801817n
Abstract: The recent infatuation for LiFePO4 as positive electrode material in Li-ion batteries has prompted a renewed interest in olivine-type structures, with a view to enhance their conduction proper-ties. We show that the dual substitution of Li for Fe and of P for Si in the olivine LiFePO4 phase leads to a complete solid solution Li1-xFe1+xP1-xSixO4 as deduced from combined X-ray diffraction, Mossbauer, and NMR experiments. Our findings challenge the common belief that the anionic network cannot be substituted. Moreover. it is found that such a substitution promotes Li intersite mixing between the olivine M1 and M2 sites. Such mixing, together with the worsening of the conducting properties of the dually substituted samples, is believed to be responsible for the poor electrochemical performances of the member's series. Beyond x = 0.20, the samples were electrochemically inactive. While the current materials are disappointing application-wise, such a study provides clues to the rich chemistry remaining to be unveiled with olivine-type structures in particular and polyanionic compounds in general.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 35
DOI: 10.1021/cm801817n
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“Formation of vortex clusters and giant vortices in mesoscopic superconducting disks with strong disorder”. Escoffier W, Grigorieva IV, Misko VR, Baelus BJ, Peeters FM, Vinnikov LY, Dubnos S, Journal of physics : conference series 97, 012172 (2008). http://doi.org/10.1088/1742-6596/97/1/012172
Abstract: Merged, or giant, multi-quanta vortices (GVs) appear in very small superconductors near the superconducting transition due to strong confinement of magnetic flux. Here we present evidence for a new, pinning-related, mechanism for vortex merger. Using Bitter decoration to visualise vortices in small Nb disks, we show that confinement in combination with strong disorder causes individual vortices to merge into clusters/GVs well below Tc and Hc2, in contrast to well-defined shells of individual vortices found in the absence of pinning.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
DOI: 10.1088/1742-6596/97/1/012172
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“Functionalization of MWCNTs with atomic nitrogen : electronic structure”. Ruelle B, Felten A, Ghijsen J, Drube W, Johnson RL, Liang D, Erni R, Van Tendeloo G, Dubois P, Hecq M, Bittencourt C;, Journal of physics: D: applied physics 41, 045202 (2008). http://doi.org/10.1088/0022-3727/41/4/045202
Abstract: The changes induced by exposing multi-walled carbon nanotubes (CNTs) to atomic nitrogen were analysed by high-resolution transmission electron microscopy (HRTEM), x-ray and ultraviolet photoelectron spectroscopy. It was found that the atomic nitrogen generated by a microwave plasma effectively grafts chemical groups onto the CNT surface altering the density of valence electronic states. HRTEM showed that the exposure to atomic nitrogen does not significantly damage the CNT surface.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.588
Times cited: 16
DOI: 10.1088/0022-3727/41/4/045202
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“Gas-phase loading of [Zn4O(btb)2] (MOF-177) with organometallic CVD-precursors: inclusion compounds of the type [LnM]a@MOF-177 and the formation of Cu and Pd nanoparticles inside MOF-177”. Müller M, Lebedev OI, Fischer RA, Journal of materials chemistry 18, 5274 (2008). http://doi.org/10.1039/b810989c
Abstract: The highly porous and desolvated (activated) coordination polymer [Zn4O(btb)2] (btb = benzene-1,3,5-tribenzoate; MOF-177) was loaded with the organometallic compounds [Cp2Fe], [Cp*2Zn], [Cu(OCHMeCH2NMe2)2], [CpCuL] (L = PMe3, CNtBu) and [CpPd(3-C3H5)] via solvent-free adsorption from the gas-phase. The inclusion compounds of the type [LnM]a@MOF-177, where [LnM] indicates the respective compound and the parameter a denotes the number of molecules per formula unit of the MOF-177, were characterised by elemental analysis, FT-IR, solid-state NMR spectroscopy and by powder X-ray diffraction (PXRD). Remarkably high effective loadings of up to 11 molecules [Cp2Fe] and 10 molecules [CpPd(3-C3H5)] per cavity were determined. The analytical data prove that the host lattice and the guest molecules interact only by weak van-der-Waals forces without any significant change of the framework or the chemical nature of the included molecules. Cu nanoparticles showing the typical surface plasmon resonance at 580 nm and Pd nanoparticles of about 2.6 nm in size were formed inside the cavities of MOF-177 by the thermally activated hydrogenolysis of the inclusion compounds [CpCuCNtBu]2@MOF-177 and by photolysis of [CpPd(3-C3H5)]10@MOF-177 in an inert atmosphere (Ar). PXRD, FT-IR and NMR studies revealed that the MOF-177 matrix remained unchanged during the decomposition process of the precursors. N2 adsorption studies of the obtained materials Cu@MOF-177 (e.g. 10.6 wt.% Cu, 2309 m2 g-1) and Pd@MOF-177 (e.g. 32.5 wt.%, 1063 m2 g-1) reveal high remaining specific surface areas (Langmuir model).
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 65
DOI: 10.1039/b810989c
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“General 2D Schrödinger-Poisson solver with open boundary conditions for nano-scale CMOS transistors”. Pourghaderi MA, Magnus W, Sorée B, de Meyer K, Meuris M, Heyns M, Journal of computational electronics 7, 475 (2008). http://doi.org/10.1007/s10825-008-0257-8
Abstract: Employing the quantum transmitting boundary (QTB) method, we have developed a two-dimensional Schrödinger-Poisson solver in order to investigate quantum transport in nano-scale CMOS transistors subjected to open boundary conditions. In this paper we briefly describe the building blocks of the solver that was originally written to model silicon devices. Next, we explain how to extend the code to semiconducting materials such as germanium, having conduction bands with energy ellipsoids that are neither parallel nor perpendicular to the channel interfaces or even to each other. The latter introduces mixed derivatives in the 2D effective mass equation, thereby heavily complicating the implementation of open boundary conditions. We present a generalized quantum transmitting boundary method that mainly leans on the completeness of the eigenstates of the effective mass equation. Finally, we propose a new algorithm to calculate the chemical potentials of the source and drain reservoirs, taking into account their mutual interaction at high drain voltages. As an illustration, we present the potential and carrier density profiles obtained for a (111) Ge NMOS transistor as well as the ballistic current characteristics.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 1.526
Times cited: 3
DOI: 10.1007/s10825-008-0257-8
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