News & Events

News & Events

Oct, 2015 - Nov, 2015

Speaker: Timo Laehde
Affiliation: Institute for Advanced Simulation, Juelich, Germany
Abstract Details:

I discuss how Quantum Monte Carlo methods developed for studies of the electronic structure of graphene can be applied to carbon nanotubes, and show first results for the interaction-induced energy gap. I also review previous Monte Carlo results for the critical coupling of the semimetal-insulator transition in graphene. I also discuss how our results for carbon nanotubes could be used to constrain the strength and form of the electron-electron interaction in graphene.


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Speaker: Dr Eoin Conor O\\\'FARRELL
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Speaker: Wolfgang Knoll
Affiliation: Austrian Institute of Technology
Abstract Details: This contribution is a short summary of areas in which graphene-based electronic devices can be developed into new classes of biosensors, highly sensitive, label free, disposable and cheap, with electronic signals that are easy to analyze and interpret, suitable for multiplexed operation and for remote control, compatible with NFC technology, etc. – in many cases a clear alternative to optical sensors. The presented areas concern diagnostic challenges in: - DNA/ Amplicon/ Aptamer sensing - Protein/ Biomarker diagnostics - Food Quality Monitoring and Pathogen Detection - Electronic Crop Disease Detection - Bio-Mimetic Smell Sensor for Medical/ Cancer Diagnostics - Developing a Membrane Chip The presentation is meant to give a few examples of what has been achieved in the respective area in our group, to point to the main scientific challenges, and to briefly outline the potential for commercialization and innovation in the biosensor market.
About the Speaker: Wolfgang Knoll graduated from the University of Konstanz in 1976 with a PhD degree in Biophysics after having completed a physics education at the Karlsruhe University of Technology. From 1980- 1981 he was a visiting scientist at the IBM Research Laboratory in San Jose and the Institute Laue- Langevin in Grenoble, from 1981-1986 an Assistant Professor at the Technical University of Munich, and in 1986 he joined the Max Planck Institute for Polymer Research in Mainz, Germany, as a group leader. From 1991-1999 he was the Director of the Laboratory for Exotic Nanomaterials, hosted by the Institute of Physical and Chemical Research (RIKEN) in Wako/Japan. From 1993 to 2008 he was a Director at the Max Planck Institute for Polymer Research in Mainz, Germany. In 1998 he became a Professor of Chemistry (by courtesy) at the University of Florida in Gainesville, in 1999 he was appointed Adjunct Professor at Hanyang University in Seoul, Korea, and from 1999 to 2003 he was a Temasek Professor at NUS. Since 2008 he has been the Scientific Managing Director at the AIT Austrian Institute of Technology, Vienna, Austria, and became a Visiting Professor at Nanyang Technological University in Singapore in 2010. He is a Member of the Austrian Academy of Sciences and holds an Honorary PhD degree from the University of Twente, the Netherlands. He has published more than 750 papers with almost 25000 citations which earned him an h-index of 82."
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Speaker: Prof. Paul Wormald and Prof. Barbaros Oezyilmaz
Abstract Details: The NUS Centre for Advanced 2D Materials and NUS Division of Industrial Design have recently started a joint effort towards developing “Innovative Products using Graphene”. As part of this effort Prof Barbaros Oezyilmaz and Prof. Paul Wormald a course in which ten teams of design students, linking up with NGS science graduate students speculated on products which exploit graphene’s fundamental properties. During this presentation the teams will share and display their new product ideas in short 5 minute presentations. I would like to in particular encourage students funded directly by the Center and NGS students to attend. We are planning to offer this course again next year and will be looking for science students to participate either directly or as teaching assistants.   (*) Do register early due to limited vacancies. (**) Pizza and refreshments will be served.
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Speaker: Ben Hu
Affiliation: Akron University, USA
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Speaker: Wu Jing
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Speaker: K. S. Novoselov
Affiliation: University of Manchester, UK
Abstract Details: The advent of graphene and related 2D materials has recently led to a new technology: heterostructures based on these atomically thin crystals. The paradigm proved itself extremely versatile and led to rapid demonstration of tunnelling diodes with negative differential resistance, tunnelling transistors, photovoltaic devices, etc. By taking the complexity and functionality of such van der Waals heterostructures to the next level we introduce quantum wells engineered with one atomic plane precision. We describe light emitting diodes made by stacking up metallic graphene, insulating BN and various semiconducting monolayers into complex but carefully designed sequences. By preparing the heterostructures on elastic and transparent substrates, we show that they can also provide the basis for flexible and semi-transparent electronics. The range of functionalities for the demonstrated heterostructures is expected to grow further with increasing the number of available 2D crystals and improving their electronic quality.
About the Speaker: Prof Sir Konstantin Novoselov FRS is best known for isolating graphene at The University of Manchester in 2004, and was awarded the Nobel Prize for Physics in 2010 for his achievements with graphene. Kostya holds positions of Langworthy Professor of Physics and the Royal Society Research Professor at The University of Manchester.
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Speaker: Roberto Raimondi
Affiliation: Roma Tre University, Italy
Abstract Details: In this talk I will present some of the results obtained over the last year about spin-orbit induced effects in a two-dimensional electron gas. At first I will discuss the spin current swapping effect according to which a spin current flowing in the i direction with spin polarization along the j axis is converted into a spin current flowing in the j direction with spin polarization along the i axis. I will analyze the circumstances under which to observe the effect and its connection with the spin Hall effect. As a second topic I will focus on the spin Hall effect due to the skew-scattering mechanism induced by phonon scattering. A comparison will be made with the standard skew-scattering due to impurities and the consequences for the temperature dependence of the spin Hall angle will be analyzed. Finally, I will present a model with a striped Rashba spin-orbit coupling, which could possibly be realized in LAO/STO interfaces. Such a non homogeneous spin-orbit coupling may give rise to a spin Hall effect robust with respect to impurity scattering."
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Speaker: Allan H. MacDonald
Affiliation: University of Texas at Austin, USA
Abstract Details: 2D materials are interesting in part because they can be arranged at will within the three-dimensional world in which we live.  I will discuss the possibility of realizing new electrical and electro-optical properties based on the properties of multi-layers formed from two-dimensional semiconductors and two-dimensional insulators.  I will focus mainly on the case of spatially indirect exciton condensates, but comment briefly on coupling between two-dimensional excitons and two-dimensional photons defined by vertical cavities.
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Speaker: Boris Narozhny
Affiliation: Karlsruher Institut Technologie, Germany
Abstract Details: We present an effective hydrodynamic theory of electronic transport in graphene in the interaction-dominated regime. We derive the emergent hydrodynamic description from the microscopic Boltzmann kinetic equation taking into account dissipation due to Coulomb interaction and find the viscosity of Dirac fermions in graphene for arbitrary densities. The viscous terms have a dramatic effect on transport coefficients in clean samples at high temperatures. Within linear response, we show that viscosity manifests itself in the nonlocal conductivity as well as dispersion of hydrodynamic plasmons. Beyond linear response, we apply the derived nonlinear hydrodynamics to the problem of hot-spot relaxation in graphene.
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