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The multiflavor Mott insulators, whose local Hilbert space consists of multiple degrees of freedom, occur widely in both quantum materials and ultracold atom systems. This Comment recommends the review article by Chen and Wu that is, to the author’s knowledge, the first one to deal with all aspects and physical realizations of the multiflavor Mott insulators.
For the first time, the nature of the carriers in strongly underdoped cuprates has been mapped with spin polarized scanning tunneling spectroscopy by a group in Nanjing, revealing that these form mysterious collective entities living on plaquettes of size 4 lattice constants with intriguing internal structure.
