EPL 30th Anniversary Session

Wednesday September 7th
16:45-16:50 - Welcome:
Sir John Enderby (EPLA Senior Scientific Advisor)
- CSI Amsterdam: drop impact and blood pattern analysis on the crime scene: Daniel Bonn
Institute of Physics of the University of Amsterdam

When a bloodstain pattern created by an impact is found on a crime scene, it may be possible to determine where the origin was of that pattern by using bloodstain pattern analysis. To determine the location of the blood source, investigators often use a straight-line approximation for the trajectory of blood droplets, ignoring effects of gravity and drag, and thus in general over-estimating the height of the victim. We developed a novel method that allows us to take gravity and air resistance into account in the trajectory calculation. By including these in the trajectory calculation, the origin's location can be determined roughly four times more accurately than the methods currently in use.

Afbeelding invoegenDaniel Bonn is director of the Institute of Physics of the University of Amsterdam, where over 200 researchers work. He is also group leader of the Complex Fluids Group, which studies the flow behavior of surfactant, polymer and colloid systems, and totals about 30 people. Before coming to Amsterdam recently, he was a CNRS research director at the prestigious Ecole Normale Supérieure in Paris, where he led the ‘complex fluids’ group. He published more than 200 papers on wetting, complex fluids and hydrodynamics and was invited more than 40 times as a speaker at international conferences In the past five years. Daniel Bonn has a large amount of industrial collaborations such as with Michelin, SKF, Unilever, Shell etc. and is co-founder of the startup company GreenA that just received a Round A investment from a venture capital firm and now employs several people.

- Quantum computation with molecular nanomagnets: Fernando Luis
Facultad de Ciencias, Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009 Zaragoza, SPAIN
The manipulation of quantum superpositions of bit states gives resources to crack tough computational problems, relevant to the design of new chemicals and materials, the safe data protection and communication and the efficient search in large databases, which are beyond those affordable by any classical device. An outstanding challenge is to scale up quantum computation architectures to a level where they are of practical use. In recent years, magnetic molecular clusters have been proposed as suitable materials for the realization of the quantum hardware. In this talk, I describe experiments performed on simple molecules that contain either one or two weakly coupled magnetic ions. These experiments show that such molecules can perform as, respectively, single qubits and two-qubit gates, i.e., that they can realize the basic building blocks of a universal quantum computer. Besides, I discuss the coupling of such magnetic molecules to quantum superconducting circuits, and how these hybrid devices can contribute to develop a scalable magnetic quantum processor.

Afbeelding invoegenFernando Luis is a staff researcher at the Aragon Institute of Materials Science, a joint venture of the Spanish Council of Scientific Research (CSIC) and the University of Zaragoza, where he leads the Molecular Chips group. He completed his PhD in Physics at the University of Zaragoza in 1997 with a thesis on the phenomenon of magnetic quantum tunneling, which he contributed to discover in 1996 (Europhys. Lett. 35, 301 (1996)). Between 1998 and 2000, he worked as a Marie Curie researcher at the Kamerlingh Onnes Laboratory (Leiden University, the Netherlands). He has co-authored more than 120 scientific papers and co-edited the book "Molecular nanomagnets: from physics to applications”, published by Springer in 2014. His research focuses on the study of magnetic nanoparticles and molecular clusters, with a special interest on quantum phenomena that occur near absolute zero, as well as on its applications to the field of quantum information.

- How the hungry random walker clears out a maze:Tanja Schilling1 & Thomas Voigtmann2
Physics and Materials Science Research Unit, Universite du Luxembourg - L-1511 Luxembourg, Luxembourg, tanja.schilling@uni.lu
Institut fuer Materialphysik im Weltraum, Deutsches Zentrum fuer Luft- und Raumfahrt (DLR), D-51170 Koeln, Germany

We study chemotaxis in a porous medium using as a model a biased (”hungry”) random walk on a percolating cluster. Incidentally, the model closely resembles the 1980s arcade game Pac-Man. We observe that, on the percolating cluster, the hungry random walker's mean-squared displacement shows anomalous dynamics that follow a power law with a dynamical exponent different from both that of a self-avoiding random walk as well as that of an unbiased random walk. The change in dynamics with the propensity to move towards food is well described by a dynamical exponent that depends continuously on this propensity.

Afbeelding invoegenTanja Schilling is a professor at the University of Luxembourg. Her research focus is in computational and theoretical soft matter physics. She obtained her PhD in 2001 from the University of Cologne, Germany, and then worked as a Marie Curie postdoc at the Institute for Atomic and Molecular Physics in Amsterdam, the Netherlands. From 2004 to 2009 she had an Emmy Noether research group at the University of Mainz, Germany. Since 2010 she is a full professor in Luxembourg, where she introduced the Master programme in physics and works on percolation in composite materials, the crystallization process, and on rare event sampling techniques.

18:20-20:00 - reception