Customized magneto-optical trap allows for cooling indium atoms to near absolute zero

Customized magneto-optical trap allows for cooling indium atoms to near absolute zero
Optimization of the MOT atom number. We vary the MOT detuning Δ, the MOT laser intensity (expressed in the figure as the saturation parameter s0=I/MIsat), and the magnetic-field gradient ∂B/∂z at the trap center projected along the z axis. The measurement is taken by fixing the detuning and then varying s0 and ∂B/∂z until the atom number maximizes. Each bar represents the best atom number observed for a given detuning. The trapped atom number fluctuations are estimated from the standard deviation of multiple atom number measurements for the same MOT parameters. Credit: Physical Review A (2022). DOI: 10.1103/PhysRevA.105.L061101

A team of researchers at the National University of Singapore has developed a customized magneto-optical trap (MOT) to cool indium atoms to near absolute zero. In their paper published in the journal Physical Review A, the group describes customizing their MOT and its performance when cooling millions of indium atoms.

Over the past several years, scientists have found that cooling some confers unique and sometimes useful properties to the atoms. Using the technique, researchers have created quantum sensors and , for example. To cool atomic gases, scientists use MOTs to cool by applying a spatially varying and then firing a laser to push the atoms out of their ground state. Unfortunately, this technique has been found to work on only a small number of atomic groups on the periodic table. To date, it has only worked on alkaline-earth and , which means that most of the atoms listed on the table have not been tested at extremely cold temperatures.

In this new effort, rather than a transition, the researchers used a transition from a more long-lived metastable state in their MOT. This required modifying it to work with just indium atoms.

Once the reconfiguration was completed, the researchers created a cloud made up of more than 500 million indium-115 atoms in their MOT. They found that their modifications allowed for cooling the atoms to approximately 1 mK for 12.3 seconds, which is about the same amount of time that MOTs have been used to chill other atoms. They suggest it is likely that MOTs in general could be changed to chill other types of atoms as well.

The researchers note that they have not yet used their customized MOT to carry out experiments on the chilled clouds, such as performing quantum measurements, but they see no reason why it would not be feasible. They conclude that their technique could be used by other researchers to open up new avenues of research on atoms in other parts of the periodic table.

More information: Xianquan Yu et al, Magneto-optical trapping of a group-III atom, Physical Review A (2022). DOI: 10.1103/PhysRevA.105.L061101

Journal information: Physical Review A

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