Physicists at MIT have identified a new mechanism for how materials switch between electronic states. By studying the rare-earth material erbium tritelluride, the research team observed how electrons organize into wave-like patterns known as charge density waves. These waves act like a checkerboard, where multiple phases of electron behavior exist at once.
Understanding these transitions is key to developing future quantum devices. Current electronic components rely heavily on silicon, but quantum materials that host coexisting phases could provide the foundation for next-generation hardware. The researchers used laser pulses to disturb these patterns and track how they reemerged. By shaking the material with a laser pulse and listening to the electronic response with a second pulse, they mapped exactly how each wave phase forms.
The findings reveal that the two charge density waves in erbium tritelluride form in distinct ways. The first phase emerges gradually and uniformly, behaving like a standard second-order transition. However, the second phase forms through isolated pockets that expand like ice crystals. This suggests a first-order transition that was previously debated in the field of quantum physics.
This study offers a new method for uncovering hidden physics in complex materials. By teasing apart how these phases interact, researchers can better understand collective phenomena like superconductivity and magnetism. The ability to watch these processes in real-time gives engineers a clearer path toward designing materials with specific performance characteristics for advanced computing and sensing technology.