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Longitudinal Spin Diffusion in a Nondegenerate Trapped ^{87}Rb Gas.

D Niroomand¹, S D Graham¹, J M McGuirk¹

¹Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

Physical Review Letters

|August 29, 2015

Summary

This summary is machine-generated.

Coherent domain walls in ultracold rubidium-87 gas slow spin diffusion and alter oscillation frequencies. This quantum coherence leads to spin conversion and increased system coherence.

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Area of Science:

Atomic physics
Quantum dynamics
Condensed matter physics

Background:

Investigating spin dynamics in ultracold atomic gases is crucial for understanding quantum phenomena.
Trapped atomic systems provide a controllable platform for studying fundamental quantum interactions.

Purpose of the Study:

To study longitudinal spin diffusion in a trapped Rubidium-87 sample.
To investigate the impact of domain wall coherence on spin dynamics.

Main Methods:

Utilizing a trapped Rubidium-87 sample above quantum degeneracy.
Analyzing the longitudinal spin diffusion and domain wall dynamics.

Main Results:

Coherence in the domain wall results in slower-than-classical transverse-spin-mediated longitudinal spin diffusion.
Domain wall coherence alters the oscillation frequency of pseudospin domains.
Observed instability in longitudinal spin dynamics due to spin component coupling.
Demonstrated conversion of longitudinal spin to transverse spin, increasing overall system coherence.

Conclusions:

Domain wall coherence significantly modifies spin diffusion and dynamics in ultracold atomic systems.
The coupling between longitudinal and transverse spins can lead to spin conversion and enhanced coherence.