Quantum interference traps electron waves in metal for first time
Ever since quantum mechanics first described particles, like electrons, as rippling waves, researchers have wondered if those waves could be trapped in place. Writing today in Science a century later, a team of Columbia University researchers reports waves of electrons becoming trapped for the first time in a metal called Pd₅AlI₂.
Quantum physicists at Columbia University have observed for the first time a phenomenon where electron waves become trapped in a metal called Pd₅AlI₂. This discovery, reported in the journal Science, marks the first direct evidence of quantum interference trapping a state within a metal. The team, led by Raquel Queiroz, discovered that the electrons in Pd₅AlI₂ experience "frustration" due to the material's atomic arrangement, which gives the electrons competing paths to hop from atom to atom.
These paths cancel each other out, effectively binding the electrons in place. This phenomenon, known as a bound state in the continuum (BIC), has been observed before in light waves but never in electrons. While optical BICs have been used in various technologies, the electronic BIC observed in Pd₅AlI₂ could lead to advancements in quantum sensors, information transfer, and quantum computers.
The researchers are now exploring ways to deliberately introduce defects into the material to fine-tune the interference patterns and potentially discover other metals with similar structures that could host electronic BICs.
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