Dynamics of a buffer-gas-loaded, deep optical trap for molecules

• URL: http://arxiv.org/abs/2301.12620v2
• Date: Wed, 5 Jul 2023 21:15:27 GMT
• Title: Dynamics of a buffer-gas-loaded, deep optical trap for molecules
• Authors: Ashwin Singh, Lothar Maisenbacher, Ziguang Lin, Jeremy Axelrod, Cristian Panda and Holger M\"uller
• Abstract summary: We describe an approach to optically trapping small, chemically stable molecules at cryogenic temperatures. The 10 K trap depth will be produced by a tightly-focused, 1064-nm cavity capable of reaching intensities of hundreds of GW/cm2$. Molecules will be directly buffer-gas loaded into the trap using a helium buffer gas at 1.5 K.
• Score: 2.07811670193148
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We describe an approach to optically trapping small, chemically stable molecules at cryogenic temperatures by buffer-gas loading a deep optical dipole trap. The ~10 K trap depth will be produced by a tightly-focused, 1064-nm cavity capable of reaching intensities of hundreds of GW/cm$^2$. Molecules will be directly buffer-gas loaded into the trap using a helium buffer gas at 1.5 K. The very far-off-resonant, quasielectrostatic trapping mechanism is insensitive to a molecule's internal state, energy level structure, and its electric and magnetic dipole moment. Here, we theoretically investigate the trapping and loading dynamics, as well as the heating and loss rates, and conclude that $10^4$-$10^6$ molecules are likely to be trapped. Our trap would open new possibilities in molecular spectroscopy, studies of cold chemical reactions, and precision measurement, amongst other fields of physics.

Related papers

• High density loading and collisional loss of laser cooled molecules in an optical trap [5.79316046874697]
  SrF molecules from a red-detuned magneto-optical trap (MOT) are compressed and cooled in a blue-detuned MOT. We observe two-body loss with rate coefficient $beta = 2.7+1.2_-0.8times 10-10 text cm3 text s-1$. Achieving this density and temperature opens a path to evaporative cooling towards quantum degeneracy of laser-cooled molecules.
  arXiv  Detail & Related papers  (2023-07-11T15:35:51Z)
• Efficient Reduction of Casimir Forces by Self-assembled Bio-molecular Thin Films [62.997667081978825]
  Casimir forces, related to London-van der Waals forces, arise if the spectrum of electromagnetic fluctuations is restricted by boundaries. We experimentally investigate the influence of self-assembled molecular bio and organic thin films on the Casimir force between a plate and a sphere. We find that molecular thin films, despite being a mere few nanometers thick, reduce the Casimir force by up to 14%.
  arXiv  Detail & Related papers  (2023-06-28T13:44:07Z)
• Magnetic trapping of ultracold molecules at high density [0.0]
  We report magnetic trapping of NaLi molecules in the triplet ground state at high density and ultralow temperature. This allows studies on both atom-molecule and molecule-molecule collisions in the ultracold regime. We demonstrate sympathetic cooling of NaLi molecules in the magnetic trap by radio frequency evaporation of co-trapped Na atoms.
  arXiv  Detail & Related papers  (2022-11-20T23:33:26Z)
• Studying chirality imbalance with quantum algorithms [62.997667081978825]
  We employ the (1+1) dimensional Nambu-Jona-Lasinio (NJL) model to study the chiral phase structure and chirality charge density of strongly interacting matter. By performing the Quantum imaginary time evolution (QITE) algorithm, we simulate the (1+1) dimensional NJL model on the lattice at various temperature $T$ and chemical potentials $mu$, $mu_5$.
  arXiv  Detail & Related papers  (2022-10-06T17:12:33Z)
• Evaporation of microwave-shielded polar molecules to quantum degeneracy [1.8133492406483585]
  We demonstrate cooling of a three-dimensional gas of fermionic sodium-potassium molecules to well below the Fermi temperature using microwave shielding. The molecules are protected from reaching short range with a repulsive barrier engineered by coupling rotational states with a blue-detuned circularly polarized microwave. This large elastic-to-inelastic collision ratio allows us to cool the molecular gas down to 21 nanokelvin, corresponding to 0.36 times the Fermi temperature.
  arXiv  Detail & Related papers  (2022-01-13T18:53:27Z)
• Rapid generation of all-optical $^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance [58.720142291102135]
  We investigate the production of all-optical $39$K Bose-Einstein condensates with different scattering lengths using a Feshbach resonance near $33$ G. We are able to produce fully condensed ensembles with $5.8times104$ atoms within $850$ ms evaporation time at a scattering length of $232. Based on our findings we describe routes towards high-flux sources of ultra-cold potassium for inertial sensing.
  arXiv  Detail & Related papers  (2022-01-12T16:39:32Z)
• High-resolution 'magic'-field spectroscopy on trapped polyatomic molecules [62.997667081978825]
  Rapid progress in cooling and trapping of molecules has enabled first experiments on high resolution spectroscopy of trapped diatomic molecules. Extending this work to polyatomic molecules provides unique opportunities due to more complex geometries and additional internal degrees of freedom.
  arXiv  Detail & Related papers  (2021-10-21T15:46:17Z)
• Ultracold $^{88}\rm{Sr}_2$ molecules in the absolute ground state [0.0]
  We report efficient all-optical creation of an ultracold gas of alkaline-earth-metal dimers in their absolute ground state. Our results pave the way for the use of alkaline-earth-metal dimers for high-precision spectroscopy.
  arXiv  Detail & Related papers  (2021-08-12T23:33:17Z)
• Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic [52.77024349608834]
  We introduce a novel algorithmic cooling protocol for transferring phonons from poorly- to efficiently-cooled modes. We demonstrate it experimentally by simultaneously bringing two motional modes of a Be$+$-Ar$13+$ mixed Coulomb crystal close to their zero-point energies. We reach the lowest temperature reported for a highly charged ion, with a residual temperature of only $Tlesssim200mathrmmu K$ in each of the two modes.
  arXiv  Detail & Related papers  (2021-02-24T17:46:15Z)
• Dipolar evaporation of reactive molecules to below the Fermi temperature [2.9989215527241453]
  Inelastic losses in molecular collisions have greatly hampered the engineering of low-entropy molecular systems. Here, we use an external electric field along with optical lattice confinement to create a two-dimensional (2D) Fermi gas of spin-polarized potassium-rubidium (KRb) polar molecules. Direct thermalization among the molecules in the trap leads to efficient dipolar cooling, yielding a rapid increase in phase-space density.
  arXiv  Detail & Related papers  (2020-07-23T22:02:59Z)
• Force and acceleration sensing with optically levitated nanogram masses at microkelvin temperatures [57.72546394254112]
  This paper demonstrates cooling of the center-of-mass motion of 10 $mu$m-diameter optically levitated silica spheres to an effective temperature of $50pm22 mu$K. It is shown that under these conditions the spheres remain stably trapped at pressures of $sim 10-7$ mbar with no active cooling for periods longer than a day.
  arXiv  Detail & Related papers  (2020-01-29T16:20:35Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.