Tags: multiscale modeling and simulation

All Categories (61-79 of 79)

  1. The Long and Short of Pick-up Stick Transistors: A Promising Technology for Nano- and Macro-Electronics

    11 Apr 2006 | | Contributor(s):: Muhammad A. Alam

    In recent years, there has been enormous interest in the emerging field of large-area macro-electronics, and fabricating thin-film transistors on flexible substrates. This talk will cover recent work in developing a comprehensive theoretical framework to describe the performance of these "pick-up...

  2. Thermal Microsystems for On-Chip Thermal Engineering

    04 Apr 2006 | | Contributor(s):: Suresh V. Garimella

    Electro-thermal co-design at the micro- and nano-scales is critical for achieving desired performance and reliability in microelectronic circuits. Emerging thermal microsystems technologies for this application area are discussed, with specific examples including a novel micromechanical...

  3. Irradiation and Nanomechanics of Multi-Walled Carbon Nanotubes

    23 Mar 2006 | | Contributor(s):: Sharon Pregler, Susan Sinnott

    Irradiation of nanotube structures with electron and ion beams has been used to produce functionalized nanotubes and fundamentally new structures, including junctions. Here, we build on previous studies to investigate the low-energy electron and ion (Ar and CF3) beam irradiation of triple walled...

  4. Engineering the Fiber-Matrix Interface in Carbon Nanotube Composites

    23 Mar 2006 | | Contributor(s):: Sharon Pregler, Yanhong Hu, Susan Sinnott

    Particle depositions on polymer and carbon substrates to induce surface chemical modification are a growing research topic in particle-surface interactions due to localized deposition energy and the high density of molecules impacting the surface. Previous simulations have shown that particle...

  5. Molecular Transport Structures: Elastic Scattering, Vibronic Effects and Beyond

    13 Feb 2006 | | Contributor(s):: Mark Ratner, Abraham Nitzan, Misha Galperin

    Current experimental efforts are clarifying quite beautifully the nature of charge transport in so-called molecular junctions, in which a single molecule provides the channel for current flow between two electrodes. The theoretical modeling of such structures is challenging, because of the...

  6. Nano-Scale Device Simulations Using PROPHET-Part II: PDE Systems

    20 Jan 2006 | | Contributor(s):: Yang Liu, Robert Dutton

    Part II uses examples toillustrate how to build user-defined PDE systems in PROPHET.

  7. Nano-Scale Device Simulations Using PROPHET-Part I: Basics

    20 Jan 2006 | | Contributor(s):: Yang Liu, Robert Dutton

    Part I covers the basics of PROPHET,including the set-up of simulation structures and parameters based onpre-defined PDE systems.

  8. Nano-Scale Device Simulations Using PROPHET

    20 Jan 2006 | | Contributor(s):: Yang Liu, Robert Dutton

    These two lectures are aimed to give a practical guide to the use of a general device simulator (PROPHET) available on nanoHUB. PROPHET is a partial differential equation (PDE) solver that offers users the flexibility of integrating new models and equations for their nano-device simulations. The...

  9. Hierarchical Physical Models for Analysis of Electrostatic Nanoelectromechanical Systems (NEMS)

    05 Jan 2006 | | Contributor(s):: Narayan Aluru

    This talk will introduce hierarchical physical models and efficient computational techniques for coupled analysis of electrical, mechanical and van der Waals energy domains encountered in Nanoelectromechanical Systems (NEMS). Numerical results will be presented for several silicon...

  10. First Principles-based Atomistic and Mesoscale Modeling of Materials

    01 Dec 2005 | | Contributor(s):: Alejandro Strachan

    This tutorial will describe some of the most powerful and widely used techniques for materials modeling including i) first principles quantum mechanics (QM), ii) large-scale molecular dynamics (MD) simulations and iii) mesoscale modeling, together with the strategies to bridge between them. These...

  11. Bandstructure in Nanoelectronics

    01 Nov 2005 | | Contributor(s):: Gerhard Klimeck

    This presentation will highlight, for nanoelectronic device examples, how the effective mass approximation breaks down and why the quantum mechanical nature of the atomically resolved material needs to be included in the device modeling. Atomistic bandstructure effects in resonant tunneling...

  12. On the Reliability of Micro-Electronic Devices: An Introductory Lecture on Negative Bias Temperature Instability

    28 Sep 2005 | | Contributor(s):: Muhammad A. Alam

    In 1930s Bell Labs scientists chose to focus on Siand Ge, rather than better known semiconductors like Ag2S and Cu2S, mostly because of their reliable performance. Their choice was rewarded with the invention of bipolar transistors several years later. In 1960s, scientists at Fairchild worked...

  13. Modeling and Simulation of Sub-Micron Thermal Transport

    26 Sep 2005 | | Contributor(s):: Jayathi Murthy

    In recent years, there has been increasing interest in understanding thermal phenomena at the sub-micron scale. Applications include the thermal performance of microelectronic devices, thermo-electric energy conversion, ultra-fast laser machining and many others. It is now accepted that Fourier's...

  14. Parallel Computing for Realistic Nanoelectronic Simulations

    12 Sep 2005 | | Contributor(s):: Gerhard Klimeck

    Typical modeling and simulation efforts directed towards the understanding of electron transport at the nanometer scale utilize single workstations as computational engines. Growing understanding of the involved physics and the need to model realistically extended devices increases the complexity...

  15. Numerical Aspects of NEGF: The Recursive Green Function Algorithm

    14 Jun 2004 | | Contributor(s):: Gerhard Klimeck

    Numerical Aspects of NEGF: The Recursive Green Function Algorithm

  16. HPC and Visualization for multimillion atom simulations

    21 Jun 2005 | | Contributor(s):: Gerhard Klimeck

    This presentation gives an overview of the HPC and visulaization efforts involving multi-million atom simulations for the June 2005 NSF site visit to the Network for Computational Nanotechnology.

  17. NanoMOS 2.5 Source Code Download

    22 Feb 2005 | | Contributor(s):: Zhibin Ren, Sebastien Goasguen

    NanoMOS is a 2-D simulator for thin body (less than 5 nm), fully depleted, double-gated n-MOSFETs. A choice of five transport models is available (drift-diffusion, classical ballistic, energy transport, quantum ballistic, and quantum diffusive). The transport models treat quantum effects in the...

  18. Multiscale Modeling of the Mechanical Behavior of Polymer-Based Nanocomposites

    25 Mar 2004 | | Contributor(s):: Catalin Picu

    Polymers filled with nanoscale fillers (carbon nanotubes or nanoparticles) exhibit enhanced properties compared with the neat polymer and with the polymer filled with micron-sized fillers at same volume fraction. Most interestingly, combinations of exceptional properties may be obtained as, for...

  19. Quantum Electromechanical Systems: Are we there yet?

    05 Feb 2004 | | Contributor(s):: Andrew Cleland

    Electrons moving in a conductor can transfer momentum to the lattice via collisions with impurities and boundaries, giving rise to a fluctuating mechanical stress tensor. Driving electrons out of equilibrium by applying the voltage across the conductor, one may control this electromechanical noise.