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Viewing upcoming talks containing the keyword: 11
Speaker: Prof Osamu Ishitani (Tokyo Institute of Technology)
Both the problems of the global warming and shortage of the fossil fuels have brought about great interest in photochemical utilization of CO2 with solar energy. Efficient photocatalysts for CO2 reduction must be necessary for development of such an important technology.
We have developed novel types of photocatalytic systems using metal complexes and/or semiconductors as a photocatalyst.1 In this presentation, I will focus on the architecture of two types of the photocatalysts using transition metal complexes:
(1) A mixed photocatalytic system including a ring-shaped Re(I) multinuclear complex as a photosensitizer2
(2) Ru(II)-Re(I) and Ru(II)-Re(I) supramolecular photocatalysts.3
The efficiency of the former photocatalytic system has been highest in the reported CO2-reduction photocatalysts (ï† = 82%), and the latter photocatalysts have been most robust (TON > 3000).
On: September 11, 2015 From: 15h30 To: 16h30View talk
Physics and Astronomy Colloquia
Speaker: Professor Isabelle Ledoux-Rak (Laboratoire de Photonique Quantique et MolÃ©culaire, Ecole Normale SupÃ©rieure de Cachan, France)
2015 Holweck Prize Lecture
Joint Physics/Chemistry Colloquium
The emergence of molecular photonics at the cross-roads of physics, chemistry and device engineering has being triggered by increasing demand in various fields such as high bitrate telecommunications, sensors, and bio-imaging. The wealth of molecular structures and the exploitation of their functional and structural flexibility opens-up new, exciting horizons for this area of research. Designing highly efficient molecules with optimised photonic properties remains a major challenge after 50 years of continuous development, based on fruitful and interdisciplinary cooperation between chemists and physicists.
In this lecture, the principles of molecular engineering for quadratic nonlinear optics will be discussed, with an emphasis on metal complexes and lanthanide derivatives, on nonlinear optical characterization methods. This will be followed by a review of intermolecular interactions and various orientation methods, in order to bridge the gap between molecules to materials, towards a wide range of applications. Finally, perspectives will be provided on molecular photonics towards device–rel.
On: September 16, 2015 From: 17h15 To: 18h30View talk
Physics and Astronomy Colloquia
Speaker: Prof James F Scott (University of St Andrews)
Multiferroics are crystals that simultaneously exhibit ferromagnetism and ferroelectricity (and usually ferroelasticity, which is hysteretic stress/strain). In some cases the ferromagnetism is actually created by the ferroelectricity, by causing the spins to cant [via Dzyaloshinskii-Moriya anisotropic exchange: P.(L x M)]. These materials have become very popular in part due to the interesting new physics, previously neglected because the effects require very low crystal symmetry, and because they offer the promise of new kinds of memory devices, including voltage-tunable magnetic tunnel junctions and four-state memories (+P,+M; +P,-M; -P,+M; -P,-M) which would be vastly superior to the usual binary (0,1) Boolean algebra. At St. Andrews I am experimentally studying GaFeO3 and Pb[Fe(1/2)Ta(1/2)]y[Ti(1/2)Zr(1/2)(1-y)]O3.
On: September 25, 2015 From: 10h00 To: 11h00View talk
Speaker: Dr Roger De Souza (RWTH Aachen)
There is renewed interest in the behaviour of point defects in bulk SrTiO3 and at its extended defects due to the material's possible application in all-oxide electronics and as a memristive device. The combination of 18O/16O exchange and Secondary Ion Mass Spectrometry (SIMS) analysis constitutes a powerful tool for probing the behaviour of oxygen vacancies in oxides. In this contribution, after a brief introduction to the technique and its capabilities and limitations, I demonstrate the application of this method to investigating the behaviour of oxygen vacancies in SrTiO3 and at its extended defects (dislocations, surfaces, hetero-interfaces). Three systems will be examined: (1) single crystal SrTiO3 substrates; (2) low-angle grain boundaries in SrTiO3 comprising periodic arrays of edge dislocations; and (3) thin films samples. In general, I will emphasize the need to combine experimental and computational approaches, and I will draw attention to current challenges and outstanding problems.
On: September 30, 2015 From: 15h30 To: 16h30View talk
Cond Mat Seminars
Speaker: Graham Bruce (St Andrews)
Single-atom-resolved detection of ultracold atoms in optical lattices using quantum-gas microscopes has enabled a new generation of experiments in the field of quantum simulation. While such devices have been realised with bosonic species, a fermionic quantum-gas microscope has proven more challenging. We recently demonstrated single-site- and single-atom-resolved florescence imaging of fermionic potassium-40 atoms in a quantum-gas microscope setup using electromagnetically-induced-transparency cooling . We detected on average 1000 fluorescence photons from each single atom within 1.5 s, while keeping them close to the vibrational ground state of the optical lattice.
Our fermionic quantum-gas microscope will provide the possibility to probe quantities that are difficult to access directly, such as spin-spin-correlation functions or string-order. It would allow the study of out-of-equilibrium dynamics, the spreading of correlations and the build-up of entanglement in many-particle fermionic quantum systems. It could perform quantum simulation of the Fermi-Hubbard model, which is conjectured to capture the key mechanism behind high-temperature superconductors.
 E. Haller, J. Hudson, A. Kelly, D. Cotta, B. Peaudecerf, G. D. Bruce, and S. Kuhr, Single-atom imaging of fermions in a quantum-gas microscope, Nature Physics 11, 738-742 (2015)
On: September 30, 2015 From: 13h00 To: 14h00View talk