Synopsis: An ultracold graphene analog

The properties of graphene might be studied from another angle by putting ultracold atoms into a hexagonal optical lattice.
Synopsis figure
Illustration: K. L. Lee et al., Phys. Rev. A. (2009)

Two highly active fields of physics have merged in recent years, as researchers work to build models of condensed matter systems using ultracold atoms suspended in optical lattices. Graphene provides an environment for many intriguing physics problems, with its massless fermions, unusually high carrier mobility, and anomalous quantum Hall behavior. Now, Kean Loon Lee and colleagues at the National University of Singapore, and at Ecole Normale Supérieure and Institut Non Linéaire de Nice in France, report in Physical Review A their theoretical studies of ultracold atoms arranged in a hexagonal graphenelike optical lattice.

When atoms are loaded into optical traps researchers can control their position and the strength of their interactions. The authors model a two-dimensional honeycomb lattice of traps created by the interference of three laser beams. They then carry out tight-binding calculations of the band structure to show that a signature of graphene—transport of massless excitations—could indeed exist in this analogous system. Lee et al. also study the hopping of nearest-neighbor atoms and the influence of lattice distortions, providing a useful guidepost to future experimental efforts. – David Voss


More Features »


More Announcements »

Subject Areas

Atomic and Molecular Physics

Previous Synopsis

Next Synopsis


Attoseconds for all

Read More »

Related Articles

Viewpoint: What Goes Up Must Come Down
Atomic and Molecular Physics

Viewpoint: What Goes Up Must Come Down

A molecular fountain, which launches molecules rather than atoms and allows them to be observed for long times, has been demonstrated for the first time. Read More »

Viewpoint: Matter-Light Condensates Reach Thermal Equilibrium

Viewpoint: Matter-Light Condensates Reach Thermal Equilibrium

Making use of improved microcavities, hybrid condensates of matter and light can be tuned to reach a thermal equilibrium state, despite their finite lifetime. Read More »

Synopsis: Superfluid Shielding
Atomic and Molecular Physics

Synopsis: Superfluid Shielding

Separated Bose-Einstein condensates can be shielded from external forces if immersed in a superfluid bath. Read More »

More Articles