Just for fun… BECs can also smile: This is a BEC loaded from a dipole trap into a TAAP trap and then propagated for some time. The picture is an absorption image with darker standing for a higher number of atoms.
We are also learning to write 😉 … for example the letter H
And our latest addition … the number 9
And of course our smiling BEC
New Journal of Physics 18 075014 (2016)
Abstract: We present two novel matter-wave Sagnac interferometers based on ring-shaped time-averaged adiabatic potentials, where the atoms are put into a superposition of two different spin states and manipulated independently using elliptically polarized rf-fields. In the first interferometer the atoms are accelerated by spin-state-dependent forces and then travel around the ring in a matter-wave guide. In the second one the atoms are
fully trapped during the entire interferometric sequence and are moved around the ring in two spin-state-dep
endent `buckets’. Corrections to the ideal Sagnac phase are investigated for both cases. We experimentally demonstrate the key atom-optical elements of the interferometer such as the independent manipulation of two different spin states in the ring-shaped potentials under identical experimental conditions.
Proc. SPIE 9900 990007-990007-14 (2016)
We discuss a scheme to implement a gyroscopic atom sensor with magnetically trapped ultra-cold atoms. Unlike standard light or matter wave Sagnac interferometers no free wave propagation is used. Interferometer operation is controlled only with static, radio-frequency and microwave magnetic fields, which removes the need for interferometric stability of optical laser beams. Due to the confinement of atoms, the scheme may allow the construction of small scale portable sensors. We discuss the main elements of the scheme and report on recent results and efforts towards its experimental realization.
One of the possibilities discussed are state dependent TAAPs:
However also chip scale solutions are discussed.
We can now load up to 10^6 atoms in a perfectly flat TAAP ring.
Great news!!! we have our first BEC…