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Professor Seideman’s website

Abstract:  Inelastic electron tunneling via molecular-scale junctions can induce a variety of fascinating dynamical processes in the molecular moiety. These include vibration, rotation, inter-mode energy flow and reaction. Potential applications of current-driven dynamics in heterojunctions range from new forms of molecular machines and new modes of  conduction, to new directions in surface nanochemistry and nanolithography.

In the first part of the talk, I will discuss the qualitative physics underlying current driven dynamics in molecular-scale devices, briefly outline the theory we developed to explore these dynamics, describe the results of ongoing research on surface nanochemistry and molecular machines, and sketch several of our dreams and plans in these areas.

The application of light to control molecular motions and electronic transport in junctions is intriguing, since photonic (by contrast to electronic) sources offer (sub)femtosecond time resolution and tunable phase and polarization properties. One of several challenges, however, is the requirement of coherent light sources that are tightly localized in space. It is here that plasmonics offer an opportunity.

In the second part of the talk, we will combine plasmonics physics with concepts and tools borrowed from coherent control of molecular dynamics with two goals in mind.  One is to introduce new function into nanoplasmonics, including ultrafast elements and broken symmetry elements. The second is to develop coherent nanoscale sources and apply them to coherent control of both molecular dynamics and electric transport in the nanoscale. 

To conclude the talk, we will return to nanoelectronics, and illustrate the application of plasmonics to control of transport in the nanoscale, with a view to ultrafast electric switches.

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Abstract: Unprecedented improvements in human wellbeing over the nineteenth and twentieth centuries have been driven largely by developments flowing from advances in engineering, medicine, agriculture and technology, and by political and economic developments coupled to consumerism.  But a necessary consequence of these successes has been an equally unprecedented growth in the global population. The twenty first century will be dominated by the challenges posed by a mid-century population of around 9 billion people, all seeking a high standard of living.  Ecosystem services, an essential element of our continued wellbeing as a species, are already under threat as our need for food production, fresh water, energy sources, minerals etc. grows exponentially to meet unfettered demand. Climate change, driven by fossil fuel usage and by deforestation, provides the biggest challenge of all, since it requires a collective response of the global population, to mitigate the effect and to manage the growing impacts upon our societies. 

Well designed technological solutions are desirable and can be compatible with the continued growth of human wellbeing. The socio-political challenges in directing such a collective response are beyond anything previously managed. This may well lead to a mid-century slide into conflict caused by environmental and resource-driven challenges on a scale not previously experienced. The thesis presented here is that meeting these challenges will require a global cultural and technological transformation on much the same scale as the European Renaissance or the Industrial Revolution itself, and a clear understanding by all societies of the need to adapt and strengthen global governance procedures. Decision making at all levels will require significantly enhanced knowledge and understanding.

Abstract:
Molecular level structures and processes must, by necessity, be depicted using representations that “stand in” for the atoms and molecules themselves. Students must learn to use these representations with facility, otherwise they are doomed to memorize and regurgitate, rather than synthesize and use their knowledge in new situations. Nowhere is this more true than organic chemistry, but the development of this ability begins in introductory chemistry courses and continues on through the undergraduate and graduate curricula.

We are investigating the development of these skills beginning in introductory chemistry courses, through organic chemistry, and on to the graduate level. We have used a range of methods, including interviews, surveys, and BeSocratic – a formative assessment system that can recognize and respond to freehand structures, graphs and simple diagrams. This presentation will focus on our research findings, how we have used them to produce “intelligently designed curricula”, and the results of studies comparing students from new and traditional curricula.

Professor Cho’s webpage

Abstract — It remains a great challenge to understand how protein and RNA biomolecules fold into well-defined structures that correspond to functions in the cell. Biomolecular computer simulations have greatly improved our ability to identify and characterize the folding pathways and intermediates, but the computational demands of evaluating the forces involved restrict the size of the systems and the amount of time one can simulate. In our research group, we perform simulations of biologically relevant sized systems for timescales that can be directly compared to experiments by developing coarse-grained simulations. Also, we develop new algorithms for performing these simulations on graphics processing units (GPUs), which have been demonstrated to be well-suited for these biomolecular simulations. I will present our recent studies of 1) the telomerase RNA pseudoknot using a coarse-grained approach for RNA folding and 2) our development of GPU-optimized simulations of ribosome assembly.