A5077065430- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Surface and Thin Film Phenomena
- Electromagnetic Simulation and Numerical Methods
- Semiconductor materials and interfaces
- Photonic and Optical Devices
- Gyrotron and Vacuum Electronics Research
- Quantum Information and Cryptography
- Advanced Chemical Physics Studies
- Nuclear physics research studies
- Advanced Fiber Laser Technologies
- Fuel Cells and Related Materials
- Electromagnetic Scattering and Analysis
- Quantum optics and atomic interactions
- Nanopore and Nanochannel Transport Studies
- Chemical and Physical Properties of Materials
- Quantum chaos and dynamical systems
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- GaN-based semiconductor devices and materials
- Nanowire Synthesis and Applications
- Mathematical functions and polynomials
- Advanced Battery Technologies Research
Schott (Germany)
2004-2007
Technical University of Munich
2003-2007
Intel (United States)
2003
University of Illinois Urbana-Champaign
1997-2002
nextnano is a semiconductor nanodevice simulation tool that has been developed for predicting and understanding wide range of electronic optical properties nanostructures. The underlying idea to provide robust generic framework modeling device applications in the field nanosized heterostructures. simulator deals with realistic geometries almost any relevant combination materials one, two, three spatial dimensions. It focuses on an accurate reliable treatment quantum mechanical effects...
A fast and robust iterative method for obtaining self-consistent solutions to the coupled system of Schrödinger’s Poisson’s equations is presented. Using quantum mechanical perturbation theory, a simple expression describing dependence electron density on electrostatic potential derived. This then used implement an iteration scheme, based predictor-corrector type approach, solution differential equations. We find that this approach simplifies software implementation nonlinear problem,...
nextnano 3 is a simulation tool that aims at providing global insight into the basic physical properties of realistic three-dimensional mesoscopic semiconductor structures.It focuses on quantum mechanical such as electronic structure, optical properties, and effects electric magnetic fields for virtually any geometry combination semiconducting materials.For calculation carrier dynamics drift--diffusion model based quantum-mechanically calculated density employed.In this paper we present an...
The progress of charge manipulation in semiconductor-based nanoscale devices opened up a novel route to realise flying qubit with single electron. In the present review, we introduce concept these electron qubits, discuss their most promising realisations and show how numerical simulations are applicable accelerate experimental development cycles. Addressing technological challenges qubits that currently faced by academia quantum enterprises, underline relevance interdisciplinary cooperation...
With the recent availability of high-resolution structural information for several key ion channel proteins and large-scale computational resources, Molecular Dynamics has become an increasingly popular tool simulation. However, CPU requirements simulating transport on time scales relevant to conduction still exceed resources presently available. To address this problem, we have developed Biology Monte Carlo (BioMOCA), a three-dimensional (3D) coarse-grained particle simulator based...
This paper reviews the present status of recently developed ab-initio as well semiempirical electronic structure methods that are particularly suited for semiconductors and mesoscopic semiconductor structures. In assessing each method, we provide some additional hitherto unpublished details about its implementation. first part paper, discuss two important extensions local density functional theory, screened-exchange exact exchange method namely. We proceed with a discussion relativistic is...
In quantum nanoelectronics, numerical simulations have become an ubiquitous tool. Yet the comparison with experiments is often done at a qualitative level or restricted to single device handful of fitting parameters. this work, we assess predictive power these by comparing results model large experimental data set 110 devices 48 different geometries. The are point contacts various shapes and sizes made electrostatic gates deposited on top high mobility GaAs/GaAlAs two dimensional electron...
We present the simulation of a flash memory in which floating gate is replaced by silicon quantum dot. Unlike conventional memories, this device promises advantage self-limited direct charging with low writing voltage, thus allowing one to overcome hot carrier degradation problems. Due small dimensions device, effects are expected play an important role. To estimate their magnitude, we compare semiclassical based on solution Poisson’s equation computation solving complete system...
A general theoretical approach for the nonperturbative Bloch solution of Schrödinger's equation in presence a constant magnetic field is presented. Using singular gauge transformation based on lattice flux lines, an equivalent quantum system with periodic vector potential obtained. For rational fields this forms superlattice which Bloch's theorem then applies. Extensions to particles spin and many-body systems connections theory translation groups are discussed.
The fluctuation properties of nuclear giant resonance spectra are studied in the presence continuum decay. subspace quasibound states is specified by one-particle--one-hole and two-particle--two-hole excitations, coupling generated a scattering ensemble. It found that, with an increasing number open channels, real parts complex eigenvalues quickly decorrelate. This appears to be related transition from power-law exponential time decay survival probability initially nonstationary state.
We present a fast and robust method for the full-band solution of Schrödinger equation on grid, with goal achieving more complete description high energy states realistic temperatures. Using Fourier transforms, in one band approximation can be expressed as an iterative eigenvalue problem arbitrary shapes conduction band. The resulting then solved using Krylov subspace methods such Arnoldi iteration. demonstrate algorithm by presenting application, which we compare nonparabolic effects...
We have investigated the lateral scalability limits of conduction channels in several metal-oxide-semiconductor (MOS) structures, at room temperature, with goal to understand for which geometries and under operating conditions a narrow channel approaching quantum-wire limit can maintain reasonable isolation. A wide range calculations were carried out using an efficient two-dimensional self-consistent model based on coupled Schrödinger Poisson equations. found that good trade-off performance...
We present a fast and robust iterative method for obtaining self‐consistent solutions to the coupled system of Schrödinger′s Poisson′s equations in quantum structures. A simple expression describing dependence electron density on electrostatic potential is used implement predictor – corrector type iteration scheme solution differential equations. This approach simplifies software implementation nonlinear problem, provides excellent convergence speed stability. demonstrate algorithm by...
We present a fast and robust method for the full‐band solution of Schrödinger′s equation on grid, with goal achieving more complete description high energy states realistic temperatures. Using Fast Fourier Transforms, in one band approximation can be expressed as an iterative eigenvalue problem arbitrary shapes conduction band. The resulting then solved using Krylov subspace methods Arnoldi iteration. demonstrate algorithm by presenting example concerning non‐parabolic effects ultra‐small...
The goal of this work is to obtain a numerical solution the three-dimensional Schrodinger equation using arbitrary bands, for calculation confined states in conditions where usual parabolic approximation inadequate. A Fast Fourier Transform (FFT) algorithm was used implementation. Two simple 3-D silicon structures were solved, quantum capacitor and cavity, an ellipsoidal multi-valley non-parabolic model band structure.
UV LEDs are promising. While germicidal ultraviolet irradiation (wavelength range 240-280 nm) is an effective disinfectant but hazardous, far UV-C radiation (200-225 claimed to be both for disinfection and safe human skin eyes under direct exposure. However, deep AlGaN-based currently too costly widespread use as they suffer from poor efficiency low light output power performance, especially the regime. When lowering wavelength by increasing Al content, in-plane intensity of...