Macroscopic Ionic Flow in a Superionic Conductor Na^{+} β-Alumina Driven by Single-Cycle Terahertz Pulses

Area of Science:

• Solid-state physics
• Materials science
• Condensed matter physics

Background:

• Ionic motion is crucial for conductivity in electronic devices like batteries and memory.
• Superionic conductors exhibit high ionic mobility, making them promising for advanced applications.

Purpose of the Study:

• To experimentally demonstrate the manipulation of ions in superionic conductors using intense terahertz electric-field transients.
• To investigate the potential of terahertz pulses as a tool for controlling ionic conductivity.

Main Methods:

• Utilizing single-cycle terahertz pulses to interact with ions in sodium beta-alumina (Na+ β-alumina).
• Measuring the induced macroscopic current flow on a subpicosecond timescale.
• Analyzing the acceleration of cations within the superionic conductor's potential minima.

Main Results:

• Intense terahertz electric-field transients successfully accelerated trapped cations in Na+ β-alumina.
• A macroscopic current flow was induced on a subpicosecond timescale.
• Demonstrated significant modulation of superionic conductor properties.

Conclusions:

• Single-cycle terahertz pulses can effectively manipulate ionic motion in superionic conductors.
• This technique offers a new pathway for controlling ionic conductivity.
• Potential applications in future electronic devices, including memory, switches, and batteries.