Ultracold He*+Rb mixture experiment
We have worked on an ultracold atomic mixture of metastable triplet He (He*) and Rb. Our cooling strategy is based on a dual-species MOT, simultaneous RF- and MW-induced forced evaporative cooling in a quadrupole magnetic trap and transfer to an 1557-nm single beam optical dipole trap. We have realized the very first ultracold He*+alkali mixture in an optical dipole trap and have studied state-selective interspecies Penning ionization.
An ultracold, optically trapped mixture of 87Rb and metastable 4He atoms
Flores, Mishra, Vassen, Knoop, Eur. Phys. J. D 71, 49 (2017) (open access)
Quantum-state-controlled Penning-ionization reactions between ultracold alkali-metal and metastable helium atoms
Flores, Vassen, Knoop, Phys. Rev. A 94, 050701(R) (2016)
Simple method for producing Bose-Einstein condensates of metastable helium using a single beam optical dipole trap
Flores, Mishra, Vassen, Knoop, Appl. Phys. B 121, 391 (2015) (open access) (pdf)
Efficient production of a 87Rb F=2, mF=2 Bose-Einstein condensate in a hybrid trap
Mishra, Flores, Vassen, Knoop, Eur. Phys. J. D 69, 52 (2015) (open access) (pdf)
Ultracold mixtures of metastable He and Rb: scattering lengths from ab initio calculations and thermalization measurements
Knoop, Zuchowski, Kedziera, Mentel, Pachulski, Mishra, Flores, Vassen, Phys. Rev. A 90, 022709 (2014)
May 2017, Adonis succesfully defended his PhD thesis!
February 2016, Lifetime measurements of ultracold mixture in optical dipole trap
Time evolution of He* in the single beam optical dipole trap, both for a He*+Rb mixture that is stable against Penning ionization (h+C), and after flipping the spin of the He* atoms (h+A), showing a dramatic decrease of the trapping lifetime.
November 2015, Our first dual species hybrid trap signal!
TOF signal (He*) and absorption image (Rb) after loading in the hybrid trap together, about 4x104 atoms of each species with a lifetime exceeding 10 seconds. This is the very first ultracold He*+alkali mixture in an optical dipole trap!
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