Related Experiment Video
Updated: Jun 28, 2026
10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Efimov Effect in Ultracold Microwave-Shielded Polar Molecules
Shayamal Singh1, Chris H Greene1,2
1Purdue University, Department of Physics and Astronomy, West Lafayette, Indiana 47907, USA.
Physical Review Letters
|June 26, 2026
Summary
Shielding dipolar molecules reveals universal two- and three-body physics, predicting observable Efimov physics. This quantum-mechanical approach enables the creation and detection of molecular trimers.
Area of Science:
- Quantum mechanics
- Molecular physics
- Atomic physics
Background:
- Dipolar molecules exhibit complex anisotropic and long-range interactions.
- Understanding three-body physics is crucial for molecular systems.
- Efimov physics, a universal phenomenon in three-body systems, is typically observed in ultracold atomic gases.
Purpose of the Study:
- To present a quantum-mechanical description for the three-body physics of shielded dipolar molecules.
- To predict observable Efimov physics in this system.
- To explore the emergence of universality in two- and three-body interactions.
Main Methods:
- Quantum-mechanical calculations.
- Analysis of scattering length resonances.
- Application of the sudden approximation.
Main Results:
- Shielding enables a universal regime at the two-body level, extending to the three-body sector.
- Computed trimer binding energies show characteristic Efimov state scaling.
- The three-body parameter in dipolar units is found to be universal.
- The sudden approximation can create trimer bound states from positive energy trap states.
Conclusions:
- Efimov physics is predicted to be observable in shielded dipolar molecules.
- Universality emerges in both two- and three-body physics due to shielding.
- The sudden approximation offers a method for creating or detecting molecular trimers.
Related Concept Videos
01:14Diamagnetic Shielding of Nuclei: Local Diamagnetic Current
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
01:29Potential Due to a Polarized Object
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
01:06Nuclear Overhauser Enhancement (NOE)
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...