Nanoscale Operando Imaging of Electrically Driven Charge-Density Wave Phase Transitions

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Strongly correlated materials offer tunable properties via electrical or optical stimuli.
• Nanoscale heterogeneity significantly impacts the functionality of phase-transition-based devices.
• Characterizing microstructure-phase switching relationships requires high-resolution, sensitive techniques.

Purpose of the Study:

• To demonstrate nanoimaging of current-induced phase transformation in 1T-TaS2.
• To correlate macroscopic electrical changes with nanoscale domain evolution.
• To investigate the influence of microstructure, such as dislocations and strain, on phase transformation barriers.

Main Methods:

• Combining electrical characterization with tailored contrast enhancement in microscopy.
• Utilizing advanced beam shaping for operando microscopy.
• Performing nanoscale imaging of charge-density wave (CDW) material 1T-TaS2.

Main Results:

• Successfully imaged the nucleation and growth of CDW phase domains during electrical stimulation.
• Correlated macroscopic resistance changes with nanoscale domain dynamics.
• Quantified the impact of dislocations and strain on the transformation energy barrier.

Conclusions:

• Tailored contrast enhancement and beam shaping are effective for advanced operando microscopy of quantum materials.
• Microstructural features like dislocations and strain play a critical role in the phase switching behavior of 1T-TaS2.
• Understanding these nanoscale effects is essential for the development of functional quantum devices.