Cretan Matter Waves Group
Our paper just got published:
Precise and robust optical beam steering for space optical instrumentation
G. Drougakis, K. G. Mavrakis, S. Pandey, G. Vasilakis, K. Poulios, D. G. Papazoglou, and W. von Klitzing
CEAS Space Journal (2019)
http://dx.doi.org/10.1007/s12567-019-00271-x
We have also submitted a new white paper to the ESA Voyage 2050 call on on Atomic Experiment for Dark Matter and Gravity Exploration in Space (AEDGE). This is also available on arXiv.org.
We have just submitted a new white paper to the ESA Voyage 2050 call on how to test the equivalence principle on a satellite in space.
(PDF-version of the white paper in here)
Πρόσκληση σε Δημόσια Παρουσίαση της Διδακτορικής Διατριβής του
κ. Saurabh Pandey
(Σύμφωνα με το άρθρο 41 του Ν. 4485/2017)
Την Παρασκευή 12 Ιουλίου 2019 και ώρα 10:00 στην αίθουσα Τηλεεκπαίδευσης στο κτήριο Τμήματος Μαθηματικών και Εφαρμοσμένων Μαθηματικών, Πανεπιστημίου Κρήτης, θα γίνει η δημόσια παρουσίαση και υποστήριξη της Διδακτορικής Διατριβής του υποψήφιου διδάκτορα του Τμήματος Επιστήμης και Τεχνολογίας Υλικών κ. Saurabh Pandey με θέμα:
«Guided Matter-Wave Interferometry»
Abstract:
Atom interferometry is an extremely sensitive and accurate means of measuring time, gravity, rotation, acceleration, magnetic gradients, and even fundamental physical constants. In particular for rotation sensing, these atomic systems are 10 billion times more sensitive than the optical gyroscopes, for an equal area of the interferometer loop. For practical applications such as satellite-free navigation, the ultracold atom based gyroscopes have to become portable and compact, without compromising their sensitivity. This can be achieved by trapping and manipulation of ultracold atoms in smooth, area-enclosing waveguides. A major challenge, so far, has been the lack of ability to guide the trapped atomic wave-packets over long distances at relatively high speeds.
I will present excitation-free transport of Bose-Einstein condensates (BECs) at hypersonic speeds in magnetic time-averaged adiabatic potential (TAAP) rings traps. For the first time, matter-waves are transported for a record distance of 40 cm at hypersonic speeds without detecting any extra excitation when compared to the static case. The extreme smoothness of TAAP rings is demonstrated via the propagation of ultracold 87Rb atoms in ring waveguides. In addition, I studied atom optics with moving BECs in flat ring waveguides, to enable long distance guiding, and ultralow temperatures of the trapped atoms. I implemented an optimal cooling technique to achieve compact BEC guiding for seconds, and the effective BEC interaction energy was lowered by a factor of 30. These demonstrations provide a new platform to realize highly sensitive, miniaturized cold-atom-based gyroscopes, and investigate fundamental questions.
Federico Levi has written a research highlight in Nature Physics on our Hypersonic Transport paper in Nature.
doi: 10.1038/s41567-019-0588-3
Nature Japan reports about our matterwave guides.
A number of newspapers have reported on our ring-paper in Nature…
For details see (here)
Our article on Hypersonic Bose–Einstein condensates in accelerator rings has just been published in Nature! Congratulations to all the authors.
preprint at arxiv.org (1810.07609) (pdf)
Abstract:
When a Bose-Einstein condensate rotates in a purely harmonic potential with an angular frequency which is close to the trap frequency, its many-body state becomes highly correlated, with the most well-known being the bosonic Laughlin state. To take into account that in a real experiment no trapping potential is ever exactly harmonic, we introduce an additional weak, quartic potential and demonstrate that the Laughlin state is highly sensitive to this extra potential. Our results imply that achieving these states experimentally is essentially impossible, at least for a macroscopic atom number.
