Chirality-Based Electronics | 16 Feb 2026

Source: TH 

A new study published in Nature has demonstrated a device that can separate electrons based on their chirality (handedness) without using powerful magnetic fields, marking progress towards low-power devices. 

• Chirality in electrons: Similar to how the left and right hands are mirror images, electrons in topological semimetals possess left- or right-handed chirality. 
  • Chirality represents a specific quantum state of electrons moving inside a crystal lattice. 
  • Semimetals, or Metalloids, are brittle solids with a metallic appearance but nonmetal chemical properties. They are neither good electrical nor thermal conductors, yet they make excellent semiconductors and form amphoteric oxides. 
• Problem in detection: Chiral electrons are mixed with ordinary (non-chiral) electrons. Earlier detection methods required strong magnetic fields or chemical doping, making large-scale application impractical. 
• Role of Band Structure (Quantum Geometry): In crystals, electrons behave like waves constrained by band structure.  
  • Unlike straight electron motion in copper wiring, palladium gallium (PdGa) crystal has a “twisted” band structure, causing electrons to drift sideways. The direction of drift depends on electron chirality. 
• Device Mechanism: The team fabricated a three-armed device. By passing a current through it, the quantum geometry of PdGa acts as a valve, funnelling left-handed electrons into one arm and right-handed electrons into another, effectively demonstrating a chiral valve. 
• Path to Applications: It could lead to low-power computing technologies and novel forms of magnetic memory devices.