Detecting the full photoemission cone from laser-based ARPES experiments by leveraging deflector technology

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Materials

Background:

• Angle-resolved photoemission spectroscopy (ARPES) is crucial for studying electronic band structures.
• Current ARPES methods are limited by photon energy and analyzer collection angles.
• Existing techniques struggle to cover the full Brillouin zone of quantum materials.

Purpose of the Study:

• To enhance ARPES capabilities for comprehensive electronic band structure analysis.
• To overcome limitations in momentum range and electron collection efficiency.
• To enable full 2π photoemitted electron detection in a fixed ARPES configuration.

Main Methods:

• Utilizing novel ARPES hemispherical analyzers with deflector technology.
• Extending previous work on bias voltage acceleration of photoemitted electrons.
• Demonstrating detection of all 2π photoemitted electrons in a single, fixed setup.

Main Results:

• Successfully detected all 2π photoemitted electrons from various materials including gold, cuprates, and transition-metal dichalcogenides.
• Achieved comprehensive electronic band structure mapping in a single measurement configuration.
• Validated the effectiveness of deflector technology for enhanced ARPES data acquisition.

Conclusions:

• The developed ARPES approach enables full Brillouin zone coverage and efficient electron collection.
• This method significantly benefits time-resolved ARPES by providing identical measurement conditions for broad momentum ranges.
• The advancement offers a powerful tool for investigating quantum materials and their dynamics.