News & Events

Speaker: Giulio Casati
Affiliation: Insubria University, Italy
Abstract Details:

Dynamical nonlinear systems provide a new approach to the old problem of increasing the efficiency of thermoelectric machines. Here we discuss stylized models of classical dynamics, including noninteracting complex molecules in an ergodic billiard, a disordered hardpoint gas and systems with broken time-reversal symmetry where the Curzon-Ahlborn limit for efficiency at maximum power can be overcome . The main focus will be on the physical mechanisms, unveiled by these dynamical models, which lead to high thermoelectric efficiency approaching the Carnot limit.

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Speaker: Tony Low
Affiliation: IBM TJ Watson Research Center
Abstract Details:

The discovery of the first truly two-dimensional material, graphene, has potential impact on many fronts of applications ranging from electronics, optoelectronics, nanomechanics, solar cells etc. Recent demonstration of the first graphene integrated circuit at IBM represents a significant step in its transition from basic science to real world application. Through theory and modeling, I will discuss the electronic properties of graphene subjected to typical engineering situations, mostly corroborated with experiments. We shall see that in many instances graphene behaves very differently from silicon, presenting both engineering challenges and exciting opportunities. The impact of these new understanding on graphene nanoelectronics will be discussed.

About the Speaker:

Tony Low received his PhD from the school of Electrical and Computer Engineering at National University of Singapore in 2008. In 2007, he was a visiting scientist at Network for Computational Nanoelectronics of Purdue University where he became a post-doctoral research associate in 2008. In 2011, he joined the carbon nanoelectronics group at IBM TJ Watson research center and as the liason to several research centers under the NSF Nanoelectronics Research Initiative program for post-CMOS technologies. His research interests are in the theory and simulations of novel materials, transport physics and devices. He has contributed extensively to the exploration of graphene devices and understanding of its related transport phenomena, and had also worked on conventional semiconductor field effect devices and its spin variants. Tony is the recipient of the Singapore Millennium Fellowships 2006 and the IEEE Electron Device Society Fellowship 2005.

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Speaker: Thiti Taychatanapat
Affiliation: MIT, USA
Abstract Details: The electronic structure of trilayer graphene (TLG) has been predicted to consist of both massless single-layer-graphene-like and massive bilayer-graphene-like Dirac subbands, which should result in new types of mesoscopic and quantum Hall phenomena. However, the low mobility exhibited by TLG devices on conventional substrates has led to few experimental studies. Here we investigate electronic transport in high-mobility (>100,000 cm2 V−1 s−1) TLG devices on hexagonal boron nitride, which enables the observation of Shubnikov–de Haas oscillations and an unconventional quantum Hall effect. The massless and massive characters of the TLG subbands lead to a set of Landau-level crossings, whose magnetic-field and filling-factor coordinates enable the determination of the Slonczewski–Weiss–McClure (SWMcC) parameters used to describe the peculiar electronic structure of TLG. Moreover, at high magnetic fields, the degenerate crossing points split into manifolds, indicating the existence of broken-symmetry quantum Hall states.
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Speaker: Prof. Achim Richter
Abstract Details:

Sufficiently flat microwave resonators shaped in the form of billiards are particularly well suited to study the quantum mechanical behavior of classically chaotic systems because of the formal equivalence of the respective wave equations, i.e. the Helmholtz and the Schroedinger equation. With superconducting resonators characterized by high quality factors it has become possible for the first time to measure the spectrum of eigenmodes and their eigenfunctions completely and to determine their statistical properties. Two-dimensional billiard systems (stadium, mushroom, etc.) of different chaoticity are discussed and it is shown that they display universal features which are also evident in real mesoscopic systems of different scales, i.e. hadrons, nuclei, atoms, molecules, clusters. Special emphasis is placed on properties of measured spectra and wavefunctions, and on so called Friedel oscillations, known also from surface and condensed matter physics. Finally, chaotic scattering in microwave billiards is considered for time reversal invariant and non-invariant systems, respectively.

http://en.wikipedia.org/wiki/Achim_Richter
The office of Prof. Richter during his visit will be: S12-3-11

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Speaker: Prof. Yang Hyunsoo
Abstract Details: Tunability of the surface plasmon resonance wavelength is demonstrated by varying the thickness of Al2O3 spacer layer inserted between the graphene and nanoparticles. By varying the spacer layer thickness from 0.3 to 1.8 nm, the resonance wavelength is shifted from 583 to 566 nm. The shift is due to a change in the electromagnetic field coupling strength between the localized surface plasmons excited in the gold nanoparticles and a single layer graphene film. In contrast, when the graphene film is absent from the system, no noticeable shift in the resonance wavelength is observed upon varying the spacer thickness."
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Speaker: David Campbell
Affiliation: Boston University, USA
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Speaker: Huang Han
About the Speaker: Dr. Han Huang received his Ph.D. degree from Physics Department at Zhejiang University, China in 2008 and is currently a postdoctoral researcher in surface science group at the National University of Singapore under Prof. Andrew Wee. His current research interests include molecule–substrate interface problems associated with molecular electronics, fabrication and modification of epitaxial graphene, as well as fabrication of ultra-narrow graphene nanoribbons with atomically controlled edges.
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Speaker: Prof. Ji Wei
Abstract Details: We present a quantum perturbation theory on two-photon absorption (2PA) in monolayer and bilayer graphene which is Bernal-stacked. The theory shows that 2PA is significantly greater in bilayer graphene than monolayer graphene in the visible and infrared spectrum (up to 3 μm) with a resonant 2PA coefficient of up to 0.2 cm/W located at half of the bandgap energy, γ1 = 0.4 eV. In the visible and terahertz region, 2PA exhibits a light frequency dependence of ω–3 in bilayer graphene, while it is proportional to ω–4 for monolayer graphene at all photon energies. Within the same order of magnitude, the 2PA theory is in agreement with our Z-scan measurements on high-quality epitaxial bilayer graphene deposited on SiC substrate at light wavelength of 780 and 1100 nm. http://pubs.acs.org/doi/abs/10.1021/nl200587h
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Speaker: James Tour
Affiliation: Rice University, USA
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Speaker: Joao Nuno Rodrigues
Affiliation: U. Porto - Portugal, NUS - Graphene Centre
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