While undertaking a study of quantum topology – the wave-like behavior of particles combined with the mathematics of geometry – a team found a strange hybrid of two quantum states, each describing a different means of current.
Bismuth-based materials have provided many insights, but they require high temperatures and are complicated to synthesize and prepare. Arsenic, by contrast, can be grown in a form that is cleaner than bismuth, and is simpler to prepare. So the researchers grew crystals ofThen, they probed the sample using scanning tunneling microscopy , which produces images at subatomic scales, and photoemission spectroscopy, which measured the energy states of electrons.
"Typically, we consider the bulk band structure of a material to fall into one of several distinct topological classes, each tied to a specific type of boundary state,""This work shows that certain materials can simultaneously fall into two classes. Most interestingly, the boundary states emerging from these two topologies can interact and reconstruct into a new quantum state that is more than just a superposition of its parts.
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