Sen Zhou, Yupeng Wang, Ziqiang Wang
We argue that the binding between doubly occupied (doublon) and empty (holon) sites governs the incoherent excitations and plays a key role in the Mott transition in strongly correlated Mott-Hubbard systems. We construct a new saddle point solution with doublon-holon binding in the Kotliar-Ruckenstein slave-boson functional integral formulation of the Hubbard model. On the half-filled honeycomb lattice, the ground state exhibits a continuous transition from the semimetal to an antiferromagnetic ordered Slater insulator with coherent quasiparticles at $U_{c1}\simeq3.4t$, followed by a Mott transition into an electron-fractionalized AF$^*$ phase without coherent excitations at $U_{c2} \simeq 5.7t$. We show that doublon-holon binding unites the three important ideas of strong correlation: the coherent quasiparticles, the incoherent Hubbard bands, and the deconfined Mott insulator.
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http://arxiv.org/abs/1302.5427
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