Quantum critical Bose gas in the two-dimensional limit in the honeycomb antiferromagnet YbCl${}_3$ under magnetic fields

Yosuke Matsumoto, Simon Schnierer, Jan A. N. Bruin +5

BEC is a quantum phenomenon, where a macroscopic number of bosons occupy the lowest energy state and acquire coherence at low temperatures. It is realized not only in ${}^4$He and di…