slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Topological Matter in Optical Lattices PowerPoint Presentation
Download Presentation
Topological Matter in Optical Lattices

Loading in 2 Seconds...

play fullscreen
1 / 1

Topological Matter in Optical Lattices - PowerPoint PPT Presentation


  • 139 Views
  • Uploaded on

Topological Matter in Optical Lattices. Ultracold atomic gases trapped by laser light have become a playground for exploring quantum matter and even uncovering new phenomena not yet seen in nature.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Topological Matter in Optical Lattices' - kalil


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Topological Matter in Optical Lattices

Ultracold atomic gases trapped by laser light have become a playground for exploring quantum matter and even uncovering new phenomena not yet seen in nature.

PFC researchers at JQI have shown that this kind of optical lattice system can exhibit a never-before-seen quantum state called a topological semimetal. This state can also undergo a new type of phase transition to a topological insulator.

Harnessing the underlying phenomena of topological insulators, known as quantum hall physics, is important for developing new types of electronics and quantum information.

The team proposes an atom-optical lattice system as the ideal test bed. An ultracold gas may not sound like a solid, but under certain conditions, this unusual quantum matter behaves just like a crystal found in nature. Neutral atoms trapped by a checkerboard of laser light [lattice depicted at right] are analogous to electrons in a crystalline solid.

If the atoms do not interact with each other, an energy band structure emerges that represents the semimetal. Allowing the particles to interact disrupts the system and forces a phase transition, turning the semimetal into a topological insulator. This topological insulator does not require adding any magnetic fields or even spin-orbit coupling. It arises from many-body interactions.

Topological insulator in an optical lattice: Each atom in the lattice is represented by what looks like two dumbbells that cross. Here, this state is a property of higher orbitals and physicists represent orbitals with different shapes. To date, much of the atom-optical lattice experiments focused on physics of the lowest orbital or "s" band, represented by a sphere. Recently, scientists have been exploring physics associated with higher orbitals, like the dumbbell shaped "p" orbitals shown here.

“Topological semimetal in a fermionic optical lattice,” Kai Sun, W. Vincent Liu, Andreas Hemmerich, and S. Das Sarma, Nature Physics, 8, 67 (2012) (Published online Nov. 20, 2011)