NIST release
Physicists at JILA have made their 鈥渜uantum crystal鈥� of ultracold molecules more valuable than ever by packing about five times more molecules into it. The denser crystal will help scientists unlock the secrets of magnets and other more exotic materials.
The crystal is actually a gas of particles trapped in 3-D formation by laser beams. The trap, called an optical lattice, has wells鈥攍ocal regions of low energy鈥攍ike an egg carton made of light. The researchers maneuvered a single molecule into each well, successfully filling about 25 percent of the crystal. The structure has an advantage over a real crystal, as it is made of scientifically interesting molecules that normally would not crystallize.
in the Nov. 6, 2015, issue of Science, the JILA crystal is useful for studying correlations among the molecules鈥� 鈥渟pins,鈥� or rotations, a quantum behavior related to magnetism. The denser crystal will enable scientists to study and model complex effects such as how spin correlations or entanglement鈥攁 quantum link between the properties of separated particles鈥攕pread through a large system. Scientists might use these effects, for example, to make novel materials for electronics or other applications.
JILA is operated jointly by the National Institute of Standards and Technology (NIST) and the 麻豆影院.
鈥淭he density in the crystal is now high enough to introduce long-range order, so the molecules behave as an interconnected system instead of just a collection of isolated particles,鈥� JILA/NIST Fellow Jun Ye says. 鈥淭he molecules are close enough to each other for their spins to migrate and relocate to other molecules, allowing us to investigate quantum connections of many particles that may lead to new materials.鈥�
Each molecule consists of one potassium atom bonded to one rubidium atom. The molecules are polar, with a positive electric charge on rubidium and a negative charge on potassium. This feature means the molecules can be controlled with electric fields and can interact strongly, even when far apart.
Scientists create JILA鈥檚 quantum crystal by precisely overlapping two dense gases of ultracold potassium and rubidium atoms (left) to produce molecules that form an interconnected system (right), in which 鈥渟pin鈥� properties can migrate between molecules. The crystal could lead to development of new materials.
鈥淏ecause our molecules are polar, neighboring molecules in the lattice will interact with each other,鈥� JILA/NIST Fellow Deborah Jin says. 鈥淲hen each molecule has multiple neighbors to talk to, these interactions become much more important and affect the entire crystal.鈥�
Building the quantum crystal was something of a tour de force in atomic manipulation. While researchers can create a crystal from one atomic gas relatively easily, combining two different atomic gases was difficult. But this was necessary to arrange for the two different atoms to form a molecule. The recipe required a small cloud of rubidium atoms, a class of particles that like to act in unison, and a large cloud of potassium atoms, which tend to be more independent.
The JILA team loaded the optical lattice by overlapping the two clouds to match their densities and energy levels in the intersection so that one of each type of atom tended to accumulate in each well. Researchers then used magnetic fields and lasers to fuse the atom pairs into molecules with the lowest possible vibrational and rotational energy. Remaining stray atoms were flushed out of the trap.
JILA scientists first created ultracold molecules in 2008 and several years ago formed the first molecular crystal, in which the molecules swapped spins. To reduce chemical reactions and extend molecule lifetimes, researchers made the trap wells deeper. Now they鈥檝e achieved their next goal of filling enough wells to unify the crystal as a system, opening the door for intriguing new quantum phenomena.
The research was funded by NIST, the Air Force Office of Scientific Research, Army Research Office and the National Science Foundation.
As a non-regulatory agency of the U.S. Department of Commerce, NIST promotes U.S. innovation and industrial competitiveness by advancing measurement science, standards and technology in ways that enhance economic security and improve our quality of life.
Contact:
Laura Ost, NIST communications, 303-497-4880
laura.ost@nist.gov
Trent Knoss, CU-麻豆影院 media relations, 303-735-0528
trent.knoss@colorado.edu
Scientists create JILA鈥檚 quantum crystal by precisely overlapping two dense gases of ultracold potassium and rubidium atoms (left) to produce molecules that form an interconnected system (right), in which 鈥渟pin鈥� properties can migrate between molecules. The crystal could lead to development of new materials. Image by Steven Burrows and Ye/Jin groups/JILA.