Please inform Mr David Paredes,
if you have a news item you wish to have added to this page.
On March 6th 2010 the Mixture group observed the first Bose-Einstein condensation of 87Rb in their setup. The experimental sequence takes
~4x10887Rb atoms from a pyramid MOT source, optically pumping them into F=1, mF=-1 state and transferring them into a magnetic quadrupole trap.
A dipole beam is then switched on providing a trap ~50 micro Kelvin deep. RF evaporation is performed in the quadrupole trap and the dipole trap is then loaded by ramping down the
magnetic potential. Evaporatively cooling to BEC then takes place. On first observation our condensate atom number is ~2x105.
Our work on the slow-light Faraday effect has been published in Nature Photonics,
We show the large bandwidth of off-resonance slow-light media can be combined with
the Faraday effect to realise a high-bandwidth dispersive probe for atomic systems.
This opens up the possibility of probing atomic dynamics on a nanosecond timescale.
A broadband optical pulse of carrier wavelength 795.0 nm has been rotated by 90° in a hot Rb vapour cell.
The linearly polarised pulse, initial in the x direction (red), was observed to rotate towards the y direction with an applied magnetic
of 80 G (green) and 230 G (blue). The black curve is a far detuned non-interacting pulse.
Giant DC Kerr effect observed in Rydberg gas.
We have shown that a Rydberg ensemble has a giant Kerr non-linearity
due to the extreme polarizability of Rydberg states. This opens up the
prospect for precision electrometry and applications in quantum
information such as photon entanglement. The results have appeared in
Nature Physics (click on the image)
Congratulations to Graham Purves on recently completing his PhD! We all wish him the best of luck in his future career.
A belated welcome to Dr. Ajay Tripathi who recently joined the group. More details about Ajay's work may be found on the Members page.
The group was well represented in the Physics Department Cricket Match for the staff and student teams. The staff claimed victory by 12 runs.
A belated welcome to Dr. Igor Mourachko who joined the group in Febryary 2006. More details about Igor's work may be found on the Members page.
Observation of Inelastic losses in a two species magneto-optical trap (MOT).
The figure (below) shows the first two species florescence measurements of the Durham 87Rb-133Cs mixture.
The blue (red) line is the measured florescence of the Cs (Rb) pyramid MOT, with no Rb (Cs)MOT repumping light present.
The black line is the loading of the Cs MOT with no Rb repumping light present initially, but with the Rb repumping light unblocked after approximately 20 seconds. The number of atoms in the Cs MOT drops by approximately 20% in the presence of the Rb MOT. This is due to inelastic interspecies collisions in the pyramid MOT. We do not see a comparable drop in the number of trapped Rb atoms in the presence of Cs.
Congratulations to Paul Griffin on obtaining his PhD in " Laser Cooling and Loading of Rb into
A Large Period, Quasi-Electrostatic, Optical Lattice". Paul is now a member of the Atomic and Molecular group
at Georgia Tech. We wish him all the best in his future career.
Congratulations to Dave Smith on obtaining his PhD in Laser Cooling and Magnetic Atom Optics. Dave is currently
teaching English in Japan. We wish him the best of luck in his future career.
Dr Ifan Hughes has been awarded an EPSRC grant for "EUCAN - the UK contribution to a European cold atom network"
(EPSRC Grant Reference: EP/D054877/1).
Dr Simon Cornish has been awarded an EPSRC grant for "Magnetic transport and mixing of two distinct cold atomic gases: A new route to the study of ultracold mixtures"
(EPSRC Grant Reference: EP/D033314/1).
Prof. Charles Adams has been awarded an EPSRC grant for "Multiparticle entanglement of neutral atoms by Rydberg excitation in an optical lattice"
(EPSRC Grant Reference: EP/D037174/1).
Special congratulations to Nick Parker on winning the annual thesis prize for the IoP
Computational Physics Group, for 2004. The prize includes a £500 cash prize (i.e. 'beer money'), which
we're sure Nick will put to good use on future nights out! This is the second time in six years that a student from this group has
won the prize.
We have directly measured the change in dispersion associated with EIT in a Sagnac interferometer.
More details can be found
A very warm welcome to our new Ph.D. students; Antoine Gusdorf (supervised by
Prof. David Flower), Mark Bason (supervised by Prof. Charles Adams), and Mark
Saunders (supervised by Dr. Simon Gardiner). More details of their work and interests
can be found on their upcoming respective
Nick Parker has recently joined the
Theoretical Condensed Matter Physics group at the University of Melbourne, as a post-doctoral researcher
. All of the group wishes him the best of luck in his new position!
Cold Cs Atoms at Durham University! A new species of cold atoms for Durham.
Today Cold Cs atoms were trapped in pyramid MOT for the first time. The MOT is
the cloud of atoms just to the right of the hole in the centre of the image.
The other five clouds are reflections of the MOT image in the pyramid optics.
This work has been conducted by Simon Cornish, Patrick Tierney (pictured below,
left), and Margaret Harris (pictured below, right).
Dr Simon Gardiner has been awarded an EPSRC First Grant
"Sensitivity to Gravity of Driven Cold-Atom Dynamics"
(EPSRC Grant Reference: EP/D032970/1).
Dr Ifan Hughes has recently been awarded an EPSRC grant to conduct
investigation into Coherent Control of the formation of ultracold
molecules (EPSRC Grant Reference: EP/D502594/1). This research will
be carried out in collaboration with the University of Oxford and
University of Newcastle, as well as the newly formed IQ3
Nick Parker was jointly awarded the Department of Physics Thesis
Prize 2004-2005, for his thesis entitled "Numerical Studies of Vortices
and Dark Solitons in Atomic Bose-Einstein Condensates". Nick's prize
consisted of a £200 cash prize, which will be quite rightly consumed
in a future group night out.
The ATMOL group's official football team, the mighty Dynamo
Physics F.C. finished outside the bottom two in the league, for
the first time in four (maybe more!) years. Congratulations to manager
Paul Griffin and the star signings that ensured this success.