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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



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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.


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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  

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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

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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.


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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

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