Tunable atomic spin-orbit coupling synthesized with a modulating gradient magnetic field.

Area of Science:

• Atomic physics
• Quantum mechanics
• Condensed matter physics

Background:

• Spin-orbit coupling (SOC) is crucial for understanding electron behavior in materials.
• Previous experiments synthesized one-dimensional (1D) SOC using Raman laser fields, which can induce atomic spontaneous emission.
• Synthesizing tunable SOC in ultracold atoms offers a controlled environment for exploring quantum phenomena.

Purpose of the Study:

• To demonstrate a new method for synthesizing spin-orbit coupling (SOC) in ultracold spin-1 rubidium-87 atoms.
• To investigate the effects of tunable SOC on atomic condensates.
• To provide an alternative approach for studying interacting many-body systems with SOC.

Main Methods:

• Utilized a gradient magnetic field (GMF) and ground-state atoms to synthesize SOC, avoiding spontaneous emission.
• Tuned the strength of SOC by adjusting the modulation amplitude of the GMF.
• Observed SOC effects through collective dipole oscillations and minimum energy state studies in an atomic condensate.

Main Results:

• Successfully synthesized tunable spin-orbit coupling in ultracold spin-1 rubidium-87 atoms.
• Confirmed the effects of SOC by observing atomic condensate dynamics and energy states.
• Maintained good condensate coherence even when driven by modulated GMFs.

Conclusions:

• The GMF-based scheme provides a robust and tunable method for synthesizing SOC in ultracold atoms.
• This technique offers an alternative pathway for investigating quantum many-body systems with engineered SOC.
• The method's immunity to spontaneous emission enhances its applicability in precision quantum studies.