Tag

Quantum Phase Transition

All articles tagged with #quantum phase transition

"Surprising Demise of Quantum Fluctuations Challenges Superconductivity Theories"
physics2 years ago

"Surprising Demise of Quantum Fluctuations Challenges Superconductivity Theories"

Princeton physicists have discovered a new quantum phase transition in superconductivity, challenging established theories. By experimenting with a three-atom-thin insulator that can be switched into a superconductor, they found evidence of a sudden cessation of quantum fluctuations, defying standard theoretical descriptions. This groundbreaking research promises to enhance our understanding of quantum physics in solids and propel the study of superconductivity in new directions, highlighting the need for a new theory to explain the observed phenomena.

Observation of Fermionic Quasiparticles Vanishing in Slow Motion
physics2 years ago

Observation of Fermionic Quasiparticles Vanishing in Slow Motion

Researchers have observed fermionic quasiparticles slowly "disappearing" near a quantum phase transition in a heavy-fermion compound, marking the first direct observation of this phenomenon. Unlike bosons, fermions are not typically involved in phase transitions. The study used terahertz time-domain spectroscopy to measure the critical slowing near the transition and extract a parameter known as the critical exponent. This research provides insights into the stability of fermionic quasiparticles and could have implications for quantum information technology.