Ultrafast core-level spectroscopy reveals elusive precursors of exciton condensation in quantum materials

Many fascinating phases in quantum materials emerge when electrons, atoms and other microscopic components begin to act collectively. But these phases do not necessarily appear out of nowhere when a material crosses a transition temperature. Before long-range order develops, microscopic fluctuations can already be present.

The top 3

  1. Graphene's Unique Electronic Properties: Graphene, a single layer of carbon atoms, exhibits exceptional electrical conductivity, surpassing copper, due to its two-dimensional structure allowing electrons to move ballistically with high mobility and a unique zero band gap enabling conduction at room temperature.
  2. Topological Insulators' Robust Electron Flow: Topological insulators act as electrical insulators in their bulk but conduct electricity along their surfaces, where electrons flow with little resistance and their spin is locked to their direction of motion, making them robust against defects.
  3. High-Temperature Superconductors' Energy Promise: High-temperature superconductors can conduct electricity with zero resistance at temperatures above liquid nitrogen (around 77 Kelvin or -196°C), offering potential for revolutionizing energy transmission, storage, and advanced technologies like fusion reactors.

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