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Thursday 02 April
Gerhard M.J. Schmidt Lecture Hall
Ben May Center for Chemical Theory and Computation, lecture Prof. Kurt Binder [Info]

Ben May Center for Chemical Theory and Computation, lecture

Basic concepts related to interfaces between coexisting phases in thermal equilibrium can be traced back to the classic work of Gibbs, van der Waals, Landau, Cahn and Hilliard. Yet, these concepts still pose problems that are not well understood. The concept of an (intrinsic) interfacial profile is a key one for computing the interfacial free energy, but turns out to be ill-defined due to the inherent difficulties in separating the intrinsic profile from capillary wave broadening. A related problem is the failure of the idea of a free energy of homogeneous states inside the two-phase coexistence region in systems with short range forces. These difficulties can be avoided by computer simulation methods. Yet, the latter suffer from subtle finite size effects, which will be demonstrated in this lecture by extensive Monte Carlo simulations for 2D and 3D Ising models. It will be shown that one can understand them in terms of fluctuation phenomena associated with interfaces, such as translational degrees of freedoms of domains and "domain breathing". Correcting for these finite size effects, one can obtain accurate estimates for interfacial free energies, also for off-lattice models of fluids. Finally, it will be demonstrated that these concepts can be carried over to the study of curved interfaces (of droplets or bubbles, respectively), allowing the estimation of Tolman's length. Johannes Gutenberg Universitaet Mainz, Germany
Thursday 30 April
Perlman Chemical Sciences Building
Chemical and Biological Physics Guest Seminar Professor Masahiro Yamashita [Info]

Chemical and Biological Physics Guest Seminar

Spintronics is a key technology in the 21st century. Although bulk magnets composed of transition metals are normally used, in our study, we use Single-Molecule Magnets (SMMs) to overcome “Moore`s Limitation”. For realizing the single-molecule memory device by using spin-polarized STM, we have succeeded to write and read the spin orientations of TbPc2 as up and down, respectively. For realizing the quantum computer, the spin Qubits and coherence at room temperature are very important. For this purpose, we synthesized monomer-Porphyrin V(IV) complex (0D) and MOF-Porphyrin V(IV) complexes (3D). The 3D complex shows Rabi nutation even at room temperature due to the rigid lattice of MOF. We have succceded the encapsulation of Metal Fulleren SMMs into SWCNT, which is new spintronics. Tohoku University