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Speaker: Minoru Osada
Affiliation: NIMS and Waseda University, Japan
Abstract Details: 2D nanosheets with atomic or molecular thickness have been emerging as important due to their unique properties. Inspired by the intriguing properties of graphene, many efforts have been devoted to synthesising 2D inorganic nanosheets of various materials including metal oxides, hydroxides, and transition-metal chalcogenides as well as primarily investigating their unique electronic structures and physical properties. Among various types of inorganic nanosheets, oxide nanosheets are important, fascinating research targets because of the virtually infinite varieties of layered oxide materials with interesting functional properties. We are working on the creation of new oxide nanosheets and the exploration of their novel functionalities in electronic applications [1,2]. A variety of oxide nanosheets (such as Ti1-O2, Ti1-xCoxO2, MnO2, and perovskites) were synthesized by delaminating appropriate layered precursors into their molecular single sheets via soft- chemical process. These oxide nanosheets have distinct differences and advantages compared with graphene because of their potential to be used as insulators, semiconductors, and even conductors, depending on their composition and structures. Recently, we found that titania- or perovskite-based nanosheets exhibit superior high- performance (r = 100–320) even at a few-nm thicknesses, essential for next-generation electronics. Additionally, nanosheet-based high- capacitors exceeded textbook limits, opening a route to new capacitors and energy storage devices. Another attractive aspect is that oxide nanosheets can be organized into various nanoarchitectures by applying solution-based layer-by-layer assembly. Sophisticated functionalities or nanodevices can be designed through the selection of nanosheets and combining materials, and precise control over their arrangement at the molecular scale. We utilized oxide nanosheets as building blocks in the LEGO-like assembly, and successfully developed various functional nanodevices such as all nanosheet FETs, artificial ferroelectrics, spinelectronic devices, magneto-plasmonic materials, Li-ion batteries, etc. Our work is a proof-of-concept, showing that new functionalities and nanodevices can be made from nanosheet architectonics. [1] M. Osada and T. Sasaki, J. Mater. Chem. 19, 2503 (2009) [Review]. [2] M. Osada and T. Sasaki, Adv. Mater. 24, 210 (2012) [Review]."
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Abstract Details:

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Speaker: Mark A. Reed
Affiliation: Yale University, USA
Abstract Details: Electron devices containing molecules as the active region have been an active area of research over the last few years. In molecular-scale devices, a long standing challenge has been to create a true three-terminal device; e.g., one that operates by modifying the internal energy structure of the molecule, analogous to conventional FETs. Here we report [1] the observation of such a solid- state molecular device, in which transport current is directly modulated by an external gate voltage. We have realized a molecular transistor made from the prototype molecular junction, benzene dithiol, and have used a combination of spectroscopies to determine the internal energetic structure of the molecular junction, and demonstrate coherent transport. [2,3] Resonance- enhanced coupling to the nearest molecular orbital is revealed by electron tunnelling spectroscopy, demonstrating for the first time direct molecular orbital gating in a molecular [1] H. Song et al., Nature 462, 1039 (2009) [2] H. Song et al., J. Appl. Phys. 109, 102419 (2011) [3] H. Song et al., J. Phys. Chem. C, 114, 20431 (2010)
About the Speaker: Prof. Mark A. Reed received his Ph.D. in Physics from Syracuse University in 1983, after which he joined Texas Instruments. In 1990 Mark joined Yale University where he holds the Harold Hodgkinson Chair of Engineering and Applied Science. He was chairman of the Department of Electrical Engineering from 1995 to 2001. He is presently the Associate Director of the Yale Institute for Nanoscience and Quantum Engineering. Mark’s research activities have included the investigation of electronic transport in nanoscale and mesoscopic systems, artificially structured materials and devices, molecular scale electronic transport, plasmonic transport in nanostructures, and chem/bio nanosensors. Mark is the author of more than 200 professional publications and 6 books, has given over 25 plenary and over 370 invited talks, and holds 25 U.S. and foreign patents on quantum effect, heterojunction, and molecular devices. He is the Editor in Chief of the journal Nanotechnology and holds numerous other editorial and advisory board positions. Mark has been elected to the Connecticut Academy of Science and Engineering and Who's Who in the World. His awards include; Fortune Magazine “Most Promising Young Scientist” (1990), the Kilby Young Innovator Award (1994), the Fujitsu ISCS Quantum Device Award (2001), the Yale Science and Engineering Association Award for Advancement of Basic and Applied Science (2002), Fellow of the American Physical Society (2003), the IEEE Pioneer Award in Nanotechnology (2007), Fellow of the Institute of Electrical and Electronics Engineers (2009), and a Finalist for the World Technology Award (2010).
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Speaker: Damien Voiry
Affiliation: Materials Science and Engineering, Rutgers University
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Speaker: Alexandra Carvalho
Abstract Details: Abstract: Due to its predictive power, density functional theory is widely applied today in many areas of materials science. However, it is most useful when used as a complementary tool alongside experiment, as often is the case in the field of defect identification and engineering. In this talk, we will discuss how defects can be identified by comparing experimental observables with first principles calculations, and will analyse some examples of defect engineering in 2D materials. These include the chalcogen vacancy in transition metal dicalcogenides- a defect harmful for most electronic and optoelectronic applications but than can be explored in spintronics- and some of the defects behind the degradation of phosphorene in air.
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Speaker: Tzen Ong
Affiliation: Rutgers University, USA
Abstract Details: A key question in high temperature iron-based superconductivity is the mechanism by which the paired electrons minimize their strong mutual Coulomb repulsion. While electronically paired superconductors generally avoid the Coulomb interaction through the formation of nodal, higher angular momentum pairs, iron based superconductors appear to form singlet s-wave (s) pairs. By taking the orbital degrees of freedom of the iron atoms into account, here we argue that the s state in these materials possesses internal d-wave structure, in which a relative d-wave (L = 2) motion of the pairs entangles with the (I = 2) internal angular momenta of the d-orbitals to form a low spin J = L + I = 0 singlet. We discuss how the recent observation of a nodal gap with octahedral structure in KFe2As2 can be understood as a high spin (J = L + I = 4) configuration of the orbital and isospin angular momenta; the observed pressure-induced phase transition into a fully gapped state can then interpreted as a high-to-low spin phase transition of the Cooper pairs."
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Speaker: Anthony Leggett
Affiliation: University of Illinois at Urbana-Champaign
Abstract Details: Sir Anthony J. Leggett, the John D. and Catherine T. MacArthur Professor and Center for Advanced Study Professor of Physics, has been a faculty member at Illinois since 1983. He is widely recognized as a world leader in the theory of low-temperature physics, and his pioneering work on superfluidity was recognized by the 2003 Nobel Prize in Physics. He is a member of the National Academy of Sciences, the American Philosophical Society, the American Academy of Arts and Sciences, the Russian Academy of Sciences (foreign member), and is a Fellow of the Royal Society (U.K.), the American Physical Society, and the American Institute of Physics. He is an Honorary Fellow of the Institute of Physics (U.K.). He was knighted (KBE) by Queen Elizabeth II in 2004 'for services to physics.' Professor Leggett has shaped the theoretical understanding of normal and superfluid helium liquids and other strongly coupled superfluids. He set directions for research in the quantum physics of macroscopic dissipative systems and use of condensed systems to test the foundations of quantum mechanics. His research interests lie mainly within the fields of theoretical condensed matter physics and the foundations of quantum mechanics. He has been particularly interested in the possibility of using special condensed-matter systems, such as Josephson devices, to test the validity of the extrapolation of the quantum formalism to the macroscopic level; this interest has led to a considerable amount of technical work on the application of quantum mechanics to collective variables and in particular on ways of incorporating dissipation into the calculations. He is also interested in the theory of superfluid liquid 3He, especially under extreme nonequilibrium conditions, in high-temperature superconductivity,in the low- temperature properties of glasses and in topological quantum computing,particularly in so-called 'p+ip' Fermi superfluids."
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Speaker: Rahul Nandkishore
Affiliation: Princeton University
Abstract Details: The existing theory of quantum statistical mechanics describes open systems in contact with large reservoirs. However, experimental advances in the construction and control of isolated quantum systems have highlighted the need for an analogous theory of isolated systems. It has been realized that isolated quantum systems can support behavior which has no analogue in open quantum systems. A prominent example is the phenomenon of many body localization. Many body localization occurs in isolated quantum systems, usually with strong disorder, and is marked by absence of dissipation, absence of thermal equilibration, a strictly zero DC conductivity (even at energy densities corresponding to high temperatures), and a memory of the initial conditions that survives in local observables for arbitrarily long times. Recently, my co-workers and I have demonstrated that many body localization also opens the door to new states of matter which cannot exist in thermal equilibrium, such as topological order at finite energy density, or broken symmetry states below the equilibrium lower critical dimension. We have also uncovered a host of unexpected properties, such as a set of universal spectral features and a non-local charge response, that have striking implications for fields as diverse as quantum Hall based quantum computation and quantum control. In this talk, I review the essential features of the many body localization phenomenon, and present some of the recent progress that I have made in this field. I also discuss the implications of these results for both theory and experiment."
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