Fig. 1: Comparing a theoretical and an experimental phase diagram.
From: Tuning the BCS-BEC crossover of electron-hole pairing with pressure
a The theoretical phase diagram for an excitonic insulator showing the evolution of the ordering energy as a function of the band gap4,5. The order parameter is strongest when the band gap is zero. Note the contrast between the evolution of the order parameter on the two sides of the dome. b The experimental phase diagram of graphite at high magnetic field11,12. The insulating state resides inside a dome in the (field, temperature) plane. A second dome (starting at ≈3 T and ending at ≈70 T15) is not shown. Note the contrast between the gradual rise of the critical temperature to the summit of the dome and its abrupt drop afterwards.
