Events: Space, Earth and Environment, Rymd- och geovetenskap, Energi och miljö events at Chalmers University of TechnologyTue, 20 Mar 2018 11:04:29 +0100,-Oscar-Jaldehag.aspx,-Oscar-Jaldehag.aspxMaster thesis presentation, Oscar Jaldehag<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Oscar Jaldehag, presents his Master thesis in the Physics Master program at the University of Gothenburg Title: The dust content in detached shells around evolved stars</p>​<br /><strong>Supervisors</strong>: Matthias Maercker and Theo Khouri Physics in HgTe-based Quantum Devices<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​Colloquium by Laurens W. Molenkamp from Würzburg University, Germany</p><h4 class="chalmersElement-H4">Abstract:</h4> <div>Topological insulators are a novel class of materials that exhibit a novel state of matter – while the inside (bulk) of the materials is electrically insulating, their surface is metallic. This effect occurs because the band structure of the materials is topologically different (in a mathematical sense) from the outside world.</div> <div>This talk describes our discovery of this type of behavior while studying the charge transport properties of thin, two-dimensional layers of the narrow-gap semiconductor HgTe. These layers exhibit the quantum spin Hall effect, a quantized conductance which occurs when the bulk of the material is insulating. Using various tricks one can show that the transport occurs along one-dimensional, spin-polarized channels at the edges of the sample.</div> <div>Also thicker HgTe samples can be turned into topological insulators, but now the surface states are two-dimensional metallic sheets. The metal in these sheets is rather exotic in that the band structure is similar to that encountered for elementary particles – the charge is carried by so-called Dirac fermions. This means that experiments on these layers can be used to test certain predictions from particle theory that are difficult to access otherwise.</div> <div>As an example, I will describe experiments where a supercurrent is induced in the surface states by contacting these structures with Nb electrodes. AC investigations indicate that the induced superconductivity is strongly influenced by the Dirac nature of the surface states.We present strong evidence for the presence of a gapless Andreev mode in our junctions.</div> <div>Finally, by playing with the strain in the layers, we can turn HgTe into a Dirac semimetal, which exhibits the ‘axial anomaly’ known from particle physics when the Fermi level is tuned to the Dirac points.</div> the first results<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Joel Bergé, Department of Physics and Instrumentation, The French Aerospace Lab ONERA</p><strong>​<br />Abstract:</strong><br />MICROSCOPE is a French Space Agency (CNES) mission that aims to test the Weak Equivalence Principle (WEP) in space at the 10-15 level, i.e. two orders of magnitude better than the best on-ground tests to date. The WEP is the cornerstone of General Relativity, the postulate that led Einstein to establish his theory: it states that all bodies fall at the same rate, independently of their mass and composition. Alternative theories of gravity, like those developed to overcome such conundrums as dark energy or the unification of gravity with the forces of the standard model of particle physics, generically predict a small violation of the WEP. As a consequence, not only does MICROSCOPE test the very foundation of General Relativity, but it also provides new constraints on theories beyond Einstein’s.<br /><br />The MICROSCOPE satellite was launched on April 25, 2016. It has since then provided high-quality data. The first results (using only a small part of the total data) were announced last December.<br />In this talk, I will first introduce the MICROSCOPE mission, in particular its scientific goals and measurement principles. I will then present the exploitation phase up to now. Finally, I will discuss its first results, with an emphasis on updated constraints on some modified gravity models.<br /> Bunch by Christophe Demazière<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​From Department of Physics, Chalmers</p> cosmic magnetic fields: Applications of broadband radio spectro-polarimetry<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Shane O’Sullivan, Hamburg Observatory, University of Hamburg</p><strong>​<br />Abstract:</strong><br />A new window into the magnetic universe has been opened by radio-telescope facilities that allow broadband, continuum-polarisation observations at high spectral resolution. The bright radio sky accessible by current facilities is dominated by active galactic nuclei (AGN) that produce powerful jets of relativistic plasma emitting non-thermal synchrotron radiation. Accurately characterising the Faraday rotation properties of these radio AGN is important for studying the intrinsic magnetised structures and also for using them as reliable statistical probes of foreground magnetic fields (e.g. the intergalactic medium, intervening galaxies and the Galactic ISM). In this talk I will present recent results from millimetre, centimetre and metre wavelength spectro-polarimetric observations that highlight the different magnetoionic regions that are probed, and the challenges related to the interpretations of these results. <br /><br /><br /> Physics Colloquium by Andreas Schnyder<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​From Max-Planck Institut, Stuttgart</p>öm,-seminar-title-TBA.aspx,-seminar-title-TBA.aspxEwa Wirström, seminar title TBA<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Ewa Wirström, Senior researcher, Department of Space, Earth and Environment, Astronomy and Plasma Physics</p>​Abstract: TBA Bunch by Dag Winkler<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​From Department of Michrotechnology and Nanoscience, Chalmers</p>,-seminar-title-TBA.aspx,-seminar-title-TBA.aspxDaniel Persson, seminar title TBA<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Daniel Persson,  Associate Professor, Mathematical Sciences</p>​<strong>Abstract:</strong> TBA Physics Colloquium by Nicholas Suntzeff<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​From Texas A&amp;M University.</p>,-seminar-title-TBA.aspx,-seminar-title-TBA.aspxSatyendra Thoudam, seminar title TBA<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Satyendra Thoudam, Postdoctoral research fellow, Linnaeus University</p><strong>​Abstract:</strong> TBA Bunch by Martin Andersson<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​From Department of Chemistry and Chemical Engineering, Chalmers.</p>,-seminar-title-TBA.aspx,-seminar-title-TBA.aspxLivia Vallini, seminar title TBA<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Livia Vallini, Nordic Institute for Theoretical Physics (NORDITA)/Leiden University</p><strong>​Abstract:</strong> TBA Physics Colloquium: Compacted dimensions and singular plasmonic surfaces<p>PJ, lecture hall, Fysik Origo, Fysik</p><p>​Special Colloquium by Professor Sir John Pendry, Imperial College London, UK</p><h4 class="chalmersElement-H4">​Abstract:</h4> <div>In advanced field theories, there can be more than four dimensions to space, the excess dimensions described as compacted and unobservable on everyday length scales. We report a simple model, unconnected to field theory, for a compacted dimension realized in a metallic metasurface periodically structured in the form of a grating comprising a series of singularities. An extra dimension of the grating is hidden, and the surface plasmon excitations, though localized at the surface, are characterized by three wave vectors rather than the two of typical two-dimensional metal grating. We propose an experimental realization in a doped graphene layer.</div>,-seminar-title-TBA.aspx,-seminar-title-TBA.aspxRiccardo Catena, seminar title TBA<p>Seminarierum, seminar room, Seminarie- och biblioteksbyggnad, Onsala rymdobservatorium</p><p>​Riccardo Catena, Assistant Professor, Subatomic and Plasma Physics, Department of Physics, Chalmers</p>​<strong>Abstract:</strong> TBA Physics Colloquium by Constantino Tsallis<p>Kollektorn, lecture room, MC2-huset, MC2</p><p>From Brazilian Center for Research in Physics, Brazil</p> seminar on Electromobility<p>Palmstedtsalen, university building, Palmstedtsalen, Campus Johanneberg</p><p>​Welcome to an Initiative seminar on Electromobility, arranged by Areas of Advance Transport and Energy.</p><span class="text-normal page-content"> <strong>What role will electric vehicles play in the future, for how we plan our cities, for our economy, our health and for the environment?</strong><br /><br />Having been around for more than a century, electric vehicles are now coming into use on a scale that may have major implications  on travel and transportation - by air, by water and by land.  Areas of Advance Transport and Energy are happy to welcome you to a full day at Chalmers, where we discuss different aspects on electromobility.<br /><br /><strong>WHEN</strong>: 13 September 2018<br /><strong>WHERE</strong>: Palmstedssalen, Chalmersplatsen 1, Göteborg<br /><em>The seminar will be in English.</em><br /><br /><strong>SESSIONS</strong><br /><ul><li>Visions for the future</li> <li>Liveable cities</li> <li>Policies, regulations and driving forces</li> <li>Technology aspects on electromobility</li></ul> <br />Registration is open! <br /><a href="">REGISTER &gt;&gt;</a><br /><br /><br />More information will be published on the </span><a href=""><span class="text-normal page-content">seminar web page &gt;&gt;</span></a><br /> Sustainability Day 2018<p>TBA, Chalmers Johanneberg and Lindholmen</p><p>​Chalmers Sustainability Day is back - Tuesday 23 October 2018. This year’s theme is Good Health and Well-being.</p>​ <br />More information will follow, stay updated through the event webpage: <a href="/en/about-chalmers/Chalmers-for-a-sustainable-future/sustainability-day2018/Pages/default.aspx">Chalmers Sustainability Day 2018</a><br /><br />For now, save the date!