excitonic Mott transition Ref paper: PRL, 107, 236405 (2011)
Is the Mott criterion valid for Mott–Hubbard transition system?
https://en.wikipedia.org/wiki/Mott_criterion
The subjects of your question have a long history, for which I refer you in particular to the book Metal Insulator Transitions, 2nd edition, by NF Mott (Taylor & Francis, London, 1990). A very important paper on the subject matter is the following:
LA Turkevich, and MH Cohen, Is Expanded Fluid Mercury a Ferroelectric Excitonic Insulator?, Phys. Rev. Lett. 53, 2323 (1984).
The phase diagrams presented in this work, and the underlying discussions, are most illuminating. A similar, but much expanded discussion can be found in in particular Chapters 20, and 21 of the book Semiconductor Optics, 3rd edition, by CF Klingshirn (Springer, Berlin, 2007). See in particular the schematic phase diagram in Fig. 20.16, p. 512, as well as the phase diagram in Fig. 21.3, p. 537, of this book.
Ps. I would also recommend you the following classic texts:
[1] RS Knox, Theory of Excitons, Solid State Physics Suppl. 5, edited by F Seitz, and D Turnbull (Academic Press, New York, 1963).
[2] BI Halperin, and TM Rice, The Exitonic State at the Semiconductor-Semimetal Transition, Solid State Physics 21, edited by F Seitz, D Turnbull, and H Ehrenreich (Academic Press, New York, 1968), pp. 115-192.
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