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Previous Seminar Details

 
 

PREVIOUS COLLOQUIUMS, VISITING LECTURERS & SEMINARS:


VISITING LECTURER:

Title: From Open Quantum Walks to Open Quantum Brownian Motion
The Dodd-Walls Centre together with the University of Auckland would like to welcome visiting Professor Francesco Petruccione of the University of KwaZulu-Natal. 
When: Wednesday 14 December 2016 at 11AM 
Abstract:
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Title: Accurate and efficient analytical and numerical methods for electromagnetic scattering
presented by Dodd-Walls Centre and Victoria University of Wellington, Professor Eric Le Ru 
When: Thursday 15 December 2016 at 2:30PM 

VISITING LECTURER:

Title: Nonclassicality in Quantum Optics: Phase-Space Approach
The Dodd-Walls Centre together with the University of Auckland and the QFG SuperGroup would like to welcome visiting Professor Hyunchul Nha of Texas A&M University at Qatar.
When: Friday 16 December 2016 at 12:00PM 
 
Abstract:
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Title: Scattering Theory for Experimentalist
presented by Dodd-Walls Centre and the Department of Physics at the University of Otago, Ryan Thomas 
 
When: Friday 18 November 2016 at 12:00PM  
   
Abstract: 
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Title: Practical Quantum Metrology in Noisy Environments presented by Rosanna Nichols of the University of Nottingham
When: Tuesday 15 November at 2:00pm
Abstract:
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Title: Quantum dark solitons in the leib-liniger model as localised wavepackets of type-ii excitations
presented by Dodd-Walls Centre and Massey University, Sophie Shamailov    
Abstract:
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 Title: Topological Photonics
Presented by Professor Alexander Szameit from the Institute of Applied Physics, Universität Jena, Germany.  Distinguished Guest to the University of Auckland
 
When: Friday 28 October 2016 at 2:00pm
  
Abstract:
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Title: small refractive index, high performance: mgf2 wgm resonators for refractometric sensing and more..
presented by the Dodd-Walls Centre and The Department of Physics at the University of Otago, Harald Schwefel
 
When: Friday 14 October 2016 at 2:30pm
  
Abstract:
I will present our experimental results on refractrometric sensing with crystalline, birefringent ultra-high q mgf2 whispering gallery mode resonators. Such resonators have a refractive index that is very close to that of water, thus the evanescent field present on the surface of the resonators can penetrate deep into the surrounding medium. This provides a high sensitivity towards changes in the refractive index of the surrounding. We measured a bulk index sensitivity of 3.26 nm per riu in a millimeter sized resonator and found q-factors of more than 108 in aqueous environments. I will give also an outlook on other sensing directions with thz radiation as well as biological and chemical interactions that i intend to investigate within the framework of resonant optics.
 

Title: Crystal-Field Modelling of Hyperfine Structure for Low Symmetry Rare-Earth Doped Insulators
presented by the Dodd-Walls Centre postdoctoral fellow from the Department of Physics at the University of Otago, Sebastian Horvath
 
When: Friday 23rd September 2016 At 2:00pm To 3:00pm
  
Abstract:
Read abstract here
 

Title: Quantum Computing 2.0: The Next Generation
The DWC and The QFG Supergroup sponsored A Colloquium taken by Professor Peter Drummond, Science Director Of The Centre For Quantum And Optical Science At Swinburne University Of Technology In Melbourne
When: Friday 16th September 2016 At 12:00pm To 1:00pm
 
Abstract:
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Title: Spectroscopy of New Zealand Lamb Meat: A Preliminary Analysis
presented by Dodd-Walls Centre PhD Candidate from the Department of Chemistry at the University of Otago, Ruth Sales.
 
When: Friday 9th September 2016 at 2:30PM to 3:30PM
  
 Abstract:
 Read abstract here 

Title: Thermalisation of a Bose Gas in a Harmonic Trap
presented by Dodd-Walls Centre PhD Candidate from the Department of Physics at the University of Auckland, Dylan Brown.
 
When: Friday 19th August 2016 at 12:00PM to 1:00PM
 
Abstract:
We present recent measurements, where we excite 50% of the atoms from a BEC in a harmonic trap to a state with $2hbar k$ of momentum. This component will oscillate in the trap, and collide with the remaining BEC multiple times. We observe thermalisation of the cloud to a new equilibrium, which might include a new BEC oscillating in the trap.
 

Title: How hot are negative absolute temperatures? The case of the Bose-Einstein superfluid
 
Presented by Professor Gian-Luca Oppo, University of Strathclyde - Distinguished Visitor to Department of Physics, University of Auckland
 
When: Friday 19th August 2016 at 3:00PM to 4:00PM

Abstract:
 
Temperature is one of the physics concepts that we all believe to be easy to understand. After all there are thermometers measuring temperatures almost everywhere on earth. Understanding temperature when the physical system under consideration has more conserved quantities than just the total energy is however all but trivial. In this case, the normal kinetic temperature associated to the high speed of molecules in a gas does not work. By introducing micro-canonical temperatures, we find that it is possible to reach infinite values of the temperature and even pass it to move to negative temperatures that are above infinity.

This topic is so hot that there are still major disagreements among scientists (finally resolved in 2015) about the physical reality of negative temperature states. By using the paradigmatic examples of two-level atoms, first, and of a Bose-Einstein condensate in an optical lattice, second, we will see what negative temperatures mean, how to observe them experimentally and what is the disagreement among physicists all about.
 

Previous public lectures:

 

Title: The Genius of James CLerk Maxwell, the man who made equations speak
Public Lecture by Professor Gian-Luca Oppo, University of Strathclyde - Distinguished Visitor to Department of Physics, University of Auckland

When: Thursday 18 August 2016 at 4PM.

Abstract:

In Einstein’s office in Princeton there were three portraits: Isaac Newton, Michael Faraday and James Clerk Maxwell (1831-1879). Although Maxwell is considered by the academics as one of the most important physicists together with Newton, Galilei, Rutherford, Bohr and, of course, Einstein, his work does not enjoy the same popularity of that of his peers. In his short life, Maxwell has revolutionised the history of science with sensational discoveries: electro-magnetic waves, the speed of light, the unification of electric and magnetic forces, statistical mechanics, the vastness of the electro-magnetic spectrum, light emission, the theory of the thermostat, and even colour photography. While the nineteen century has linked thermodynamics to the industrial revolution, the twentieth century has been dominated by the consequences of Maxwell’s discoveries: the radio, the television, light-matter interactions, x-rays, the radar, the laser, mobile phones, phase transitions, spectroscopy and the internet. Quite an achievement for a shy and reserved Scot. Professor Gian-Luca Oppo is the 1796 Freeland Chair of Natural Philosophy at the University of Strathclyde (Glasgow, Scotland), a Fellow of the Royal Society of Edinburgh, the Optical Society of America, and the Institute of Physics. Professor Oppo is also a recognised teacher and science populariser, and has been awarded the University of Strathclyde Teaching Excellence Awards in 2014 and 2016.