Prof., Dr. Jens Gravesen, Technical University of Denmark, Denmark visited the BINN Theory group for three weeks. The output of this visit was two papers published in Physica Status Solidi - Rapid Research Letters on nanostructures and topological phenomena in nanotubes.
Assoc. Prof., Dr. Lars Duggen, University of Southern Denmark, Denmark visited the BINN Theory group for three weeks. The output of this visit was a paper published in J. Phys. Chem. C on nanogenerator and piezoelectric properties of single- and multilayer molybdenum disulfide.
Postdoc Oliver Marquardt, Weierstrass Institute, Berlin, Germany visited the Theory group at BINN. Oliver gave a presentation on joint work on polytype quantum wire structures and electronic bandstructures using the k.p method and density functional theory. Abstract of this work is presented at the NUSOD Conference in Hong Kong, November 4-10, 2018. We are finalizing a comprehensive study on the same work that will be submitted to Physical Review B.
Prof., Dr. Lok C. Lew Yan Voon, University of West Georgia, Georgia, USA visited the BINN Theory group for three weeks. The output of this visit was a paper on piezoelectric properties using the bond orbital model of a number of 2D materials presently in consideration for publication in Adv. Func. Mat. (Special BINN Issue).
Prof., Dr. Vladimir Fomin, IFW, Dresden, Germany visited the BINN Theory group for two days. He gave a presentation on analytical calculations of strong curvature phenomena in nanostructures.
Ass. Prof., Dr. Daniele Barettin, Universita Degli Studi Niccolo Cusano,Rome, Italy visited the BINN Theory group for three weeks. Daniele and Morten Willatzen together with the group of Prof., Dr. Yan Zhang at the University of Electronics, Science and Technology China are presently working on a paperwhere transport properties of InAs/GaAs devices are studied as well astopological insulator properties. Here, piezoelectric effects are used to tune the bandgap from a positive to a negative value making it possible to develop anovel effective on/off transistor device.
PhD student Mathias Rosdahl Brems, Technical University of Denmark, Denmark visited the BINN Theory group for two weeks. Mathias spent his time carrying out density functional theory calculations on bismuth selenide thin filmtopological insulator structures and to study the influence of strain onoptical properties. In particular, this work seeks to realize a new type of solar cell material that can be tuned with strain and we aim at submitting ourwork to Adv. Func. Mat. in December. Related earlier work in 2018 at BINN using the k.p method (with Mathias and Morten) resulted in two publications in Phys. Rev. B Rapid Comm. and New J. Phys. in 2018.