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• W2511562014 abstract "We study the charge and spin density distributions of excitonic insulator (EI) states in the tight-binding approximation. We first discuss the charge and spin densities of the EI states when the valence and conduction bands are composed of orthogonal orbitals in a single atom. We show that the anisotropic charge or spin density distribution occurs in a unit cell (or atom) and a higher rank electric or magnetic multipole moment becomes finite, indicating that the EI state corresponds to the multipole order. A full description of the multipole moments for the $s$, $p$, and $d$ orbitals is then given in general. We find that, in contrast to the conventional density-wave states, the modulation of the total charge or net magnetization does not appear in this case. However, when the conduction and valence bands include the component of the same orbital, the modulation of the total charge or net magnetization appears, as in the conventional density-wave state. We also discuss the electron density distribution in the EI state when the valence and conduction bands are composed of orbitals located in different atoms. We show that the excitonic ordering in this case corresponds to the bond order formation. Based on the results thus obtained we discuss the EI states of real materials recently reported." @default.
• W2511562014 created "2016-09-16" @default.
• W2511562014 creator A5056814234 @default.
• W2511562014 creator A5089491475 @default.
• W2511562014 date "2016-09-14" @default.
• W2511562014 modified "2023-09-27" @default.
• W2511562014 title "Electric and magnetic multipoles and bond orders in excitonic insulators" @default.
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