Researchers observe bound states in the continuum within an electronic solid

Researchers based in the United States have observed bound states in the continuum within an electronic solid system for the first time, Physics World reported. Bound states in the continuum are localized static waves that remain isolated from propagating waves that possess similar energy levels. [1]

A bound state in the continuum represents an eigenstate of a quantum system where the energy sits within the continuous spectrum of propagating modes of the surrounding space. The state does not interact with any of the surrounding continuum states, maintaining a real energy value and an infinite quality factor provided that no absorption occurs within the system [2]. Physics World reported that this phenomenon is analogous to an established effect in optics. [1][2]

In the standard electronic band structure model of materials, valence band electrons remain localized because they lack sufficient energy to move freely, while conduction band electrons occupy higher energy states. Optical bound states in the continuum have previously been used to build lasers, directional antennas, and sensors, according to Physics World. [1]

The researchers behind the experiment believe that these electronic bound states in the continuum could help simulate exotic many-body physics, Physics World reported. The authors of the study also suggested that the phenomenon could potentially find practical applications in field settings such as catalysis or the creation of novel quantum devices. [1]