Electronic States Induced by Doping a Mott Insulator in the Presence of Antiferromagnetic Order

Recent theoretical studies on the Mott transition suggest that magnetically excited states emerge in the Mott gap in the single-particle spectrum with the dispersion relation shifted by the Fermi momenta following the doping of a Mott insulator [1--4]. This characteristic is difficult to explain in terms of mean-field quasiparticles in antiferromagnetic order. Here, by taking into account spin fluctuation in the random-phase approximation, electronic states exhibiting momentum-shifted spin-wave dispersion relation are shown to emerge in the Mott gap following the doping of a Mott insulator even though antiferromagnetic order persists [5]. The results imply that the emergence of electronic states exhibiting momentum-shifted magnetic dispersion relation is a general and fundamental characteristic of the Mott transition regardless of whether antiferromagnetic order exists or not.
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[2] M. Kohno, Phys. Rev. B 92, 085129 (2015).
[3] M. Kohno, Phys. Rev. Lett. 108, 076401 (2012).
[4] M. Kohno, Phys. Rev. Lett. 105, 106402 (2010).
[5] M. Kohno, AIP Adv. 8, 101302 (2018).