Intense pulses of light can force different metals to adopt the exact same crystal structure, regardless of their original identity.
April 24, 2026
Original Paper
Electronic-Entropy-Driven Crossover to Close-Packed Phases in Transition Metals under Strong Electronic Excitation
arXiv · 2604.19222
The Takeaway
Transition metals usually change their shape based on how much pressure or heat is applied to their physical bulk. This research proves that exciting just the electrons inside a metal can override its entire physical identity. Electronic entropy becomes the dominant force, erasing the unique ground state of the material. Different metals that would normally have distinct atomic arrangements suddenly snap into identical, close-packed phases. This breakthrough allows for the creation of new materials that switch their properties instantly using light instead of slow heating or cooling cycles.
From the abstract
Solid-solid phase transitions in metals are traditionally governed by changes in density or external pressure. Here, we show that electronic entropy alone can control structural stability and drive phase transitions at fixed density across transition metals. Using finite-temperature density functional theory, we construct pressure-temperature phase diagrams for 15 metals spanning hcp, fcc, and bcc-ground-state structures. Despite their diverse ground-state behavior, all systems exhibit a common