What Is ยท Science
Quantum Tunneling
Particles slipping through barriers
Quantum tunneling is when particles described by wavefunctions cross potential barriers despite insufficient classical energy.
- probability amplitude
- barrier
- wavefunction
- semiconductors
- nuclear fusion
Definition
Quantum states extend through barriers; a small probability allows crossing.
Why It Matters
Explains fusion in stars and enables tunnel diodes and Josephson junctions.
Where You See It
Scanning tunneling microscopes measure tunneling currents to image surfaces.