Synopsis: New place to search for Efimov states

Three-body bound states, known to form among spherically symmetric atoms, should also exist for dipole molecules.
Synopsis figure
Credit: Y. Wang, Phys. Rev. Lett. (2011)

Tractable three-body problems are rare, which is why Vitaly Efimov’s study in 1970 proposing that bound states could exist between three interacting bosons was so intriguing. It took more than 30 years, though, to observe Efimov states in an ultracold gas of cesium atoms, in which interactions could be controlled with a magnetic field. Now, writing in Physical Review Letters, theorists suggest similar states should also exist between dipolar molecules.

In his prediction, Efimov assumed the interacting bosons were spherically symmetric. In their new work, Yujun Wang and colleagues at JILA, at the University of Colorado, Boulder, use numerical methods to look for bound states between molecules that have an electric dipole—an extended structure that greatly complicates the calculations. The group shows that such dipolar Efimov states are in fact long-lived and “universal,” meaning they don’t depend on the molecules’ detailed structure. (The states only exist when the separation between the molecules is large compared with the length of their dipole moment.)

Wang et al.’s prediction is timely, as it is only in the last two to three years that experimentalists have been able to cool the molecules in a gas to their absolute ground state and study and manipulate the dipole interactions between them. – Jessica Thomas


Announcements

More Announcements »

Subject Areas

Atomic and Molecular Physics

Previous Synopsis

Biological Physics

Twist or twirl

Read More »

Next Synopsis

Superconductivity

Nesting questions

Read More »

Related Articles

Synopsis: Rapid Alignment
Atomic and Molecular Physics

Synopsis: Rapid Alignment

A frequency comb can align an ensemble of molecules 150 million times per second. Read More »

Viewpoint: Negative Ions in Cold Storage
Atomic and Molecular Physics

Viewpoint: Negative Ions in Cold Storage

A cooled ring stores high-speed negative ions for more than 1000 seconds and enables new studies of atomic and molecular ions that are important in interstellar and atmospheric chemistry. Read More »

Synopsis: Spin-Orbit-Coupled Photons
Atomic and Molecular Physics

Synopsis: Spin-Orbit-Coupled Photons

Photons confined to a hexagonally shaped microcavity move in a polarization-dependent way, thus simulating a spin-orbit coupling common in materials. Read More »

More Articles