Symmetry-Breaking Assisted Landau-Zener Transitions in Rydberg Atoms

Area of Science:

• Atomic physics
• Quantum mechanics

Background:

• Landau-Zener transitions (LZT) are quantum phenomena occurring at avoided crossings.
• In Rydberg atoms, LZTs are typically observed in strong, changing electric fields.

Purpose of the Study:

• To investigate a novel method for controlling Landau-Zener transitions in Rydberg atoms.
• To explore the effect of breaking Hamiltonian symmetry on LZT dynamics.

Main Methods:

• Utilizing Rydberg atoms subjected to a changing electric field.
• Introducing a transverse magnetic field to break the system's symmetry.
• Analyzing the interactions between Stark manifolds with different magnetic quantum numbers (|m|).

Main Results:

• The applied magnetic field breaks atomic level symmetry, enabling interaction between Stark manifolds.
• Mixed state levels facilitate sequential LZTs by reducing the energy gap between target states.
• A significantly lower electric field changing rate is required for efficient LZT compared to systems without a magnetic field.

Conclusions:

• Symmetry breaking via a magnetic field provides a versatile approach to engineer controlled Landau-Zener transitions.
• This technique offers a pathway for achieving efficient LZTs in Rydberg atoms under less stringent conditions.
• The findings open new avenues for controlling quantum dynamics in various physical systems.