Phonons and their Phenomena
Friday 14th October 2011
Department of Physics, University of Warwick
Organiser: R.A. Römer (Physics, Warwick), W. Schirmacher (Universität Mainz)
Conference email: physics-events-physicsdays@forums.warwick.ac.uk
Background and Purpose
Coherent wave phenomena in disordered systems are a recurring theme of modern physics. For condensed matter at the quantum scale, Anderson localization has recently been remodernised by a series of beautiful experiments for Bose-Einstein condensates, and the exponential decay of the localized waves has been directly measured. Results agree very well with recent spatially-resolved studies in semiconductor systems. Similarly, light localization continues to be at the forefront of many research activities. For classical waves, localization phenomena have an equally impressive history and recent ultra-sound propagation experiments can now probe the spatial and multifractal structure of states close to the Anderson transition.
On the theoretical side, research has concentrated on the distinguishing characteristics of phonon localization such as the Goldstone mode at zero frequency and the Boson peak, i.e. the excess contribution to the Debye density of states due to disorder. In addition, questions of temperature dependence and thermal transport have been studied as well as multifractal properties of vibrational eigenstates.
A very interesting new avenue of research has opened up recently due to the realisation that the seminal work on electromagnetic metamaterialshas a companion in acoustic systems as well. Hence hethero unexplored and deemed unphysical regions of the phase diagram for disordered vibrations --- those with apparently negative masses and spring constants --- are now recognised to be of considerable interest for metamaterial applications and offer an entirely novel perspective of Anderson localization.
Programme
This is still a preliminary programme (031011).
| Time | Title | Speaker |
|---|---|---|
| Friday, October 14th, 2011 | ||
| 09:00-10:00 | Registration and Morning Coffee | |
| Morning Chair: Rudolf A Römer | ||
| 10:00-10:45 | Phonons and Solid-State MilliKelvin Refrigeration | Terry Whall |
| 10:45-11:30 | Boson peak and symmetry considerations | Walter Schirmacher |
| 11:30-12:15 | Anderson universality in a model of disordered phonons | Sebastian Pinski |
| 12:15-14:00 | Lunch Break | |
| Afternoon Chair: Walter Schirmacher | ||
| 14:00-14:45 | Phonons: characeristics, and role in thermal and thermoelectric phenomena | GP Srivastava |
| 14:45-15:30 | Universal features of THz absorption in glasses | Sergei Taraskin |
| 15:30-16:00 | Tea Break | |
| 16:00-16:45 | Spectra of Sparse Random Matrices and Localization on Random Graphs | Reimar Kühn |
| 16:45-17:30 | Guided Ultrasonic Waves - New Applications for "Old Physics" | Steve Dixon |
| 18:00- | something to eat | |
| 19:00- | Farewell | |
Participants
Participation is by invitation only. Please contact physics-events-physicsdays@forums.warwick.ac.uk if you think this workshop looks as if it would be of interest to you. Normally, we would be happy to accept self-invitations, but will not be able to pay for any expenses in this case.
The symposium will start at 09:30 a.m. on 14th October 2011, at the University of Warwick. Note that the university is located at the outskirts of Coventry and not in Warwick. See http://www2.warwick.ac.uk/about/visiting/ for travel details and http://www2.warwick.ac.uk/about/visiting/maps/ for maps of the central campus. In case you come by car, parking is available for delegates at car park 15.
This list of participants is accurate as of 03/10/2011.
| Name | Affiliation | Status | |
|---|---|---|---|
| Steve Dixon | Warwick | 14 October | |
| Reimar Kühn | King's College London | 14 October | |
| Rudolf A. Römer | Warwick | 14 October | |
| Sergei Taraskin | Cambridge | 14 October | |
| Walter Schirmacher | Mainz | 13-14 October | |
| GP Srivastava | Exeter | 14-15 October | |
| Terry Whall | Warwick | 14 October |
Venue and Accommodation
Registration will be held in MAS205/MAS206. All talks will be held in MAS205/MAS206. These rooms are in the new Material and Analytical Science building (37), next to Physics, on the Warwick central campus.
The workshop will start with the registration at the University of Warwick. Note that the university is located at the outskirts of Coventry and not in Warwick. See http://www2.warwick.ac.uk/about/visiting/ for travel details and http://www2.warwick.ac.uk/about/visiting/maps/ for maps on the central campus. In case you come by car, parking is available for delegates at car park 15.
Accommodation for invited speakers shall be provided at
Radcliffe Training & Conference Centre
The University of Warwick
Gibbet Hill Road
Coventry, CV4 7AL UK
Tel: +44 (0) 24 7647 4711
Fax: +44 (0) 24 7669 4282
Email: radcliffe@warwick.ac.uk
In case you are self-invited, please call the conference centre directly and arrange your stay.
Contact
Prof. Rudolf A Römer
Physics Department
University of Warwick
Coventry CV4 7AL
United Kingdom
e-mail: physics-events-physicsdays@forums.warwick.ac.uk
Phone: +44 (0)24 76574328
Fax: +44 (0)24 76150897
