California NanoSystems Institute
CNSI
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March 10, 2009

Jordan Katine
Hitachi Global Storage Technology
Applications for Nanoscale Spin Transfer Devices
The spin transfer effect gives us the ability to affect the magnetization direction of nanoscale devices via direct injection of a spin-polarized current. In this lecture, I will discuss the implications the spin transfer effect has for two device applications: nanoscale MRAM bits whose states are switched via the spin transfer effect (ST_MRAM), and high frequency current-tunable oscillators based on spin transfer devices.

February 24, 2009

Jim Hutchison
Department of Chemistry
University of Oregon


Streaming Video

Greener Nanoscience: Designing Safer Products and Cleaner Processes
The Safer Nanomaterials and Nanomanufacturing Initiative: Advancing Applications and Reducing Implications of Nanotechnology

Nanotechnology offers new materials and applications that will benefit society, yet there is growing concern about the potential health and environmental impacts of production and use of nanoscale products. Nanotechnology is still in the discovery phase and the production and design of materials have yet to be optimized. Synthetic methods are often inefficient or require the use of hazardous reactants and, although hundreds of studies of nanomaterial hazards have been reported, due (largely) to the complexity of the nanomaterials, there is no consensus about the impacts. In this presentation, I will describe how green chemistry applied to nanoscience - greener nanoscience - offers an approach to developing safer, more efficient nanosyntheses and to developing and implementing the design rules for safer nanomaterials.


February 17, 2009

Tawfik R. Arabi
Microprocessor Design Group
Intel Corporation


Streaming Video

Power and Power Delivery Challenges for the Next Generations Mobile Devices
Power Delivery has become a key element for the notebook to improve battery life and meet the Energy Star requirements. In the presentation, we will show that power delivery accounts for almost half the energy waste in the system. We will show how we improved the energy efficiency of the notebook with modeling, design, and architecture of power delivery sub system. On the modeling, we will show how an accurate modeling of the microprocessor on die voltage and temperature distributions led to power reduction. On the design and architecture side, we show how dynamically adapting the power delivery system to the load reduced average power and increased battery life. Finally, we will show the gap that needs to be bridged to get a significant increase in battery life and a significant reduction in form factor. We will show that we need a non linear improvement in voltage conversion and propose areas of research and collaboration for academia and industry.

February 10, 2009

Kent D. Choquette
Department of Electrical and Computer Engineering
University of Illinois at Urbana Champaign


Streaming Video

Nano-Photonics: Engineering Optical Properties
This presentation will discuss the application of nanotechnology to engineer optical properties of semiconductors for unprecedented confinement of both photons and electrons to develop the next generation of lasers and photonic integrated circuits. We will review the use of photonic crystals and plasmonic apertures within vertical cavity surface emitting lasers (VCSELs) to improve laser performance and create new applications for sensing, communications, and microfludics. Novel membrane optical cavities under development for nano-cavity laser diodes will also be reported.

February 03, 2009

Allan MacDonald
Department of Physics
University of Texas


Streaming Video

Pseudospintronics in Graphene
I will discuss analogies between spintronics in metals in semiconductors and pseudospin related electronics in graphene. Spintronics refers to electronics in which the spin-degree of freedom plays an essential role. In the words of its discoverer, Wolfgang Pauli, electron spin is a two-valued quantum degree-of-freedom. The electron can have not only spin-up or spin-down, but can be in a quantum state which is a linear combination of spin-up and spin-down. This kind of quantum wiliness is essential in spintronics. Single and few layer graphene systems offer a unique opportunity to exploit a quantum degrees of freedom which are analogous to spin and referred to as pseudospins, but have important potential advantages.

January 27, 2009

Chad Mirkin
Department of Chemistry & Institute for
Nanotechnology
Northwestern University


Streaming Video

Nanostructures in Biology and Medicine
We have recently reported new methods for the control of protein expression using oligonucleotide-functionalized gold nanoparticle materials. These "antisense particles", as well as similarly functionalized siRNA particles, exhibit a range of unique properties that make them very well-suited for gene regulation. In particular, the particles are highly resistant to nucleases, exhibit high entry ability into multiple cell types as a result of their DNA shell, are generally non-toxic, and can be further modified with designer nucleic acids, siRNAs, and other chemical functionalities. These nanoparticle conjugates are capable of simultaneous cellular entry, semi-quantitative mRNA detection, and genetic control. These developments represent significant advances in gene regulation and detection technologies.

January 13, 2009

C. Ken Shih
Physics,
University of Texas


Streaming Video
  

Coherently Control of Photon Emission from Semiconductor Nanostructures
Semiconductor nanostructures such as quantum dots (QDs) have offered unique opportunities to investigate sophisticated quantum optical effects in a solid-state system. These include quantum interference, Rabi oscillations, as well as photon antibunching, and were previously only observable in isolated atoms or ions. In addition, QDs can be readily integrated into optical microcavities, making them attractive for a number of applications, particularly quantum information processing and high efficiency quantum light sources. In spite of these tremendous progresses, one area that was little explored was coherently control of solid-state quantum emitters. Successful implementations of such coherent controls will open new applications in quantum information sciences such as "deterministic generation of indistinguishable single photons," I this talk I will report our progress toward this endeavor. In particular we show resonantly controlled light emissions of quantum dots in the cavity, including (a) Nearly ideal fidelity of Rabi flopping using pulse control, (b) direct observation of Mollow triplets in frequency domain, (c) simultaneously measured first-order and second order photon-photon correlations and (d) Direct observation of single-phonon mediated inter-level electronic transition.
January 06, 2009

Charles Marcus
Physics Department; Director, Center for Nanoscale Systems
Harvard University


Streaming Video
  

Holding Quantum Information in Electron Spins
This talk will review recent progress in the control of single electron spins in quantum dots. In GaAs, progress has been rapid, but may ultimately be limited by hyperfine coupling of electrons to nuclear spins of the host lattice. It appears, though, that a variant on dynamic nuclear polarization can help reduce the hyperfine field fluctuations. An alternative is to move out of GaAs, and consider materials with zero nuclear spin, where obviously hyperfine coupling is absent. Work along both of these directions will be discussed. Research Supported by ARO/iARPA, the Department of Defense, and the NSF.