1 / 1

Spin-Orbit Coupling in Ultracold Neutral Atoms

Spin-Orbit Coupling in Ultracold Neutral Atoms. PFC-supported researchers, lead by Ian Spielman , recently demonstrated for the first time spin-orbit coupling in Bose-Einstein condensates (BECs), where the neutral atoms exhibited properties similar to electrons in material systems.

kenna
Download Presentation

Spin-Orbit Coupling in Ultracold Neutral Atoms

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Spin-Orbit Coupling in Ultracold Neutral Atoms PFC-supported researchers, lead by Ian Spielman, recently demonstrated for the first time spin-orbit coupling in Bose-Einstein condensates (BECs), where the neutral atoms exhibited properties similar to electrons in material systems. The scientists engineered a laser-atom interaction whose energetic description of the system or Hamilitonian is analogous to electrons moving in specific semiconducting materials such as gallium arsenide (used as amplifiers in cell phones). The starting point for these experiments were BECs consisting of a few hundred thousand rubidium atoms in an atom trap, at temperatures around 70 billionths of a degree above absolute zero. This atomic system can be thought of as having two energy levels that are labeled “spin-up” and “spin-down” (red and blue in the diagram). To generate spin-orbit coupling the scientists prepared the atoms in a combination of the two spin states. Then the twist: a pair of laser beams created a moving pattern of light traveling across the BEC. Atoms occupying the different spin states interact with the light wave and a new energy level structure emerges that couples these spin states to their motion. The scientists verified that the spins were coupled to the motion by inspecting the atoms’ velocity and spin after releasing them from the atom trap. While creating the spin-orbit coupled BEC, Spielman’s team also uncovered another interesting phenomena: a quantum phase transition. As the intensity of the lasers is increased, researchers observe a transition between a miscible and immiscible mixture of spin states. (Image courtesy of Ian Spielman) “Spin–orbit-coupled Bose–Einstein condensates” Y.-J. Lin, K. Jiménez-García, and I. B. Spielman Nature 471,83–86, (2011)

More Related