Kosterlitz-Thouless melting of magnetic order in the triangular quantum Ising material TmMgGaO$_4$

TmMgGaO₄ is one of a number of recently-synthesized quantum magnets that are proposed to realize important theoretical models. Here the authors demonstrate the agreement between detailed experimental measurements and state-of-the-art predictions based on the 2D transverse field triangular lattice Ising model.