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Spatial Coherence of Spin-Orbit-Coupled Bose Gases
Andika Putra1, F Salces-Cárcoba1, Yuchen Yue1
1Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland, Gaithersburg, Maryland 20899, USA.
Physical Review Letters
|February 22, 2020
Summary
Spin-orbit-coupled Bose-Einstein condensates reveal new stripe and plane-wave phases. Researchers used optical Bragg scattering and an atomic Talbot effect to observe density modulations and long-range coherence in these novel quantum states.
Area of Science:
- Quantum physics
- Condensed matter physics
- Atomic physics
Background:
- Spin-orbit-coupled Bose-Einstein condensates (SOBECs) are a novel state of matter.
- SOBECs exhibit unique stripe and plane-wave phases.
- Interactions between spin components lead to spatial density modulations.
Purpose of the Study:
- To probe the density modulations in SOBECs.
- To investigate the coherence properties of stripe and plane-wave phases.
- To understand the behavior of overlapping spin components.
Main Methods:
- Optical Bragg scattering was employed to probe density modulations.
- An atomic analog of the Talbot effect was utilized.
- The study examined both miscible stripe and immiscible plane-wave phases.
Main Results:
- A sudden drop in Bragg scattering was observed as overlapping regions decreased.
- Long-range coherence was demonstrated between different spin components.
- Coherence was found to exist in both stripe and plane-wave phases, even in domain walls.
Conclusions:
- Density modulations in SOBECs are directly linked to spin-orbit coupling strength.
- Long-range coherence is a key feature of both stripe and plane-wave phases.
- The findings provide new insights into the quantum behavior of interacting spin-coupled condensates.
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