Unidirectional x-ray output from a crystal waveguide affected by Berry's phase

Area of Science:

• Condensed Matter Physics
• Optics
• Crystallography

Background:

• Berry's phase is a fundamental concept in quantum mechanics.
• Understanding X-ray behavior in crystals is crucial for advanced applications.

Purpose of the Study:

• To experimentally verify theoretical predictions of Berry's phase effects on X-rays.
• To explore the potential of deformed crystals for manipulating X-ray beams.
• To investigate practical applications of this phenomenon.

Main Methods:

• Utilizing a 15 keV X-ray beam within a deformed silicon crystal.
• Translating the X-ray beam parallel to the crystal's optical axis.
• Analyzing the beam's angular divergence and wave front post-propagation.

Main Results:

• Observed X-ray beam translation within the silicon crystal, retaining divergence and wave front.
• Achieved an output beam intensity of 3.3% of the incident beam after 1.3 mm propagation.
• Demonstrated the device's function as an X-ray intensity modulator.

Conclusions:

• Provided the first experimental evidence supporting Sawada et al.'s theoretical model of X-ray propagation.
• Revealed novel insights into the Berry phase's influence on X-rays.
• Paved the way for developing X-ray waveguides for enhanced experimental flexibility.