Discrete energy levels of MTB under Hubbard-type Coulomb blockade effect. (IMAGE)
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(a-c) Schematics showing an energy level diagram at the mean-field level, namely, out-of-phase state (a), zero-energy state (b), and in-phase state (c), respectively. Each level is marked with its wave vector. The spin-up (spin-down) electrons are depicted with red (blue) balls. The solid (hollow) balls represent electrons residing occupied (unoccupied) levels. Photo credit: Xing Yang.
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