The PREM team at the University of Texas Arlington recently created a special layered material that uses different quantum states to control how electrons move. By stopping the flow of high-energy (hot) electrons and only letting low-energy (cold) electrons pass through, they achieved an electron flow with a temperature as low as 0.8 K (-272 °C). This ultra-cold electron flow can help develop new, energy-saving transistors. More details are available in the paper, "Sub-1K Cold-Electron Switching at Room Temperature," published in Nano Letters.