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<p class="MsoNormal">This week’s John Anderson Colloquium will be delivered by Prof Andrew Mackenzie on “Water, honey and electrons - evidence for electronic hydrodynamics in naturally occurring materials.”. As usual, tea/coffee will be served afterwards.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Title: Water, honey and electrons - evidence for electronic hydrodynamics in naturally occurring materials.<o:p></o:p></p>
<p class="MsoNormal">Speaker: Andy Mackenzie (Max Planck Institute for Chemical Physics of Solids, Dresden & School of Physics & Astronomy, University of St Andrews)<o:p></o:p></p>
<p class="MsoNormal">Venue: John Anderson Building JA3.14<o:p></o:p></p>
<p class="MsoNormal">Time/Date: 3pm Wednesday 10<sup>th</sup> February 2016<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Abstract:<o:p></o:p></p>
<p class="MsoNormal">Electrical transport in solids is almost always analysed using an approximation in which all scattering is assumed to relax the momentum of the electrons. Although this can be justified in the vast majority of cases, because the electrons
are moving in a lattice to which momentum is efficiently transferred, recent measurements by several groups give evidence that it is not always true. In ultra-pure systems with extremely long mean free paths, the momentum-conserving collisions that are ignored
in standard theory can become more rapid than the momentum-relaxing ones. In this limit, the electronic flow moves into a hydrodynamic regime in which the electron fluid’s viscosity dominates the resistance measured in flow through constrained channels.
Although not very well known by people working on bulk materials, the study of such effects goes back over fifty years in the theoretical literature and over twenty years in experiments on high purity two-dimensional electron gases. I will try to review the
history of the field, then describe the new experiments, and finally make some comments about extending the investigation to other systems.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">http://www.strath.ac.uk/science/physics/research/colloquia/<o:p></o:p></p>
<p class="MsoNormal">----<o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Dr Daniel K. L. Oi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Lecturer, Quantum Information<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Computational Nonlinear & Quantum Optics<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">SUPA Department of Physics<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">University of Strathclyde<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Glasgow G4 0NG<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">United Kingdom<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Tel: +44 141 548 3112<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Fax: +44 141 552 2891<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Web: cnqo.phys.strath.ac.uk<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">The Department of Physics, University of Strathclyde, Rated No. 1 in the UK by the UK led Research Excellence Framework (REF2014).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><br>
The University of Strathclyde is a charitable body, registered in Scotland, number SCO15263<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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