Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 18: Photon BEC

Q 18.2: Vortrag

Dienstag, 3. März 2026, 11:15–11:30, P 4

Observation of critical scaling in the Bose gas universality class — •Leon Kleebank¹, Frank Vewinger¹, Arturo Camacho-Guardian², Victor Romero-Rochin², Rosario Paredes², Martin Weitz¹, and Julian Schmitt³ — ¹Institute of Applied Physics, Bonn, Germany — ²Instituto de Fisica, Mexico City, Mexico — ³Kirchhoff-Institut fur Physik, Heidelberg, Germany

Critical exponents characterize the divergent scaling of thermodynamic quantities near phase transitions and allow for the classification of physical systems into universality classes. While quantum gases thermalizing by interparticle interactions fall into the XY model universality class, the ideal Bose gas has been predicted to form a distinct universality class whose signatures have not yet been revealed experimentally. Here, we report the observation of critical scaling in a two-dimensional quantum gas of essentially noninteracting photons. We determine the critical exponent for the correlation length to be ν=0.51(3).

Keywords: Critical behavior; Universality class; Critical scaling; Photon BEC; Quantum gas