Seminar on Dipolar Molecules by Dr. Goulven QUÉMÉNER at CUHK (19/4/2016) [fr]

Dr. Goulven QUÉMÉNER is giving a seminar on " Shielding Ultracold Collisions of
Dipolar Molecules with Electric Fields" on April 19, 2016 (Tuesday) at the Department of Physics at the Chinese University of Hong Kong.

Dr. Goulven QUÉMÉNER is a researcher in at "Laboratoire Aimé Cotton, CNRS- Orsay Université Paris-Sud, France. He is part of the team "Théomol".

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Prof. Quéméner is giving a conference on Dipolar Molecules.

Date: April 19, 2016 (Tuesday)
Time: 4:00 - 5:00 p.m.
Place: Rm G25, Science Centre North Block, CUHK
Enquiries: 3943 6303

The Seminar is FREE!
ALL INTERESTED ARE WELCOME!

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Abstract:

Ultracold molecular dipolar gases often suffer from losses due to chemical reactions [1, 2] or eventual sticky collisions for non-reactive molecules [3]. Loss suppression for both bosonic and fermionic dipolar species can be obtained in an electric field in a one-dimensional optical lattice [4] but this requires usually strong confinements to get into a pure two-dimensional collision regime. An alternative way can be found without confinement using rotationally excited molecules. In this talk, I will explore the ultracold collisions of rotationally excited dipolar molecules in free space. I will focus on electric dipolar molecules of KRb [5] and electric and magnetic dipolar molecules of RbSr, SrF, BaF and YO [6]. I will show that one can sharply tune the elastic, inelastic and reactive rate coefficients of lossy molecular collisions when a second rotationally excited colliding channel crosses the threshold of the initial colliding channel, with the help of an applied electric field. We can increase or decrease the loss processes whether the second channel is above or below the initial channel and suppress loss collisions. This could lead to favorable conditions for evaporative cooling. Preliminary results on NaRb molecules, which are currently formed in the group of Pr. D. Wang at CUHK [7], will also be presented.

This conference takes place in an ANR/RGC Joint Research Scheme program called "COPOMOL" and it is about "Quantum Control of an Ultracold Gas of Polar Molecules". For this project the Hong Kong Principal Investigator isProf Dajun Wang (The Chinese University of Hong Kong) and the French Principal Investigator is Dr. Olivier Dulieu (Université Paris-Sud, Orsay)

More About this project here

[1] Ospelkaus, Ni, Wang, de Miranda, Neyenhuis, Quéméner, Julienne, Bohn, Jin, Ye, Science 327, 853 (2010)
[2] Ni, Ospelkaus, Wang, Quéméner, Neyenhuis, de Miranda, Bohn, Jin, Ye, Nature 464, 1324 (2010)
[3] Mayle, Quéméner, Ruzic, Bohn, Phys. Rev. A 87, 012709 (2013)
[4] de Miranda, Chotia, Neyenhuis, Wang, Quéméner, Ospelkaus, Bohn, Ye, Jin, Nature Physics 7, 502 (2011)
[5] G. Wang, G. Quéméner, New J. Phys. 17, 035015 (2015)
[6] G. Quéméner, J. L. Bohn, Phys. Rev. A 93, 012704 (2016)
[7] M. Guo, B. Zhu, B. Lu, X. Ye, F. Wang, R. Vexiau, N. Bouloufa-Maafa, G. Quéméner, O. Dulieu, D. Wang, arXiv 1602.394 (2016), submitted.

publié le 15/04/2016

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