Perturbation study of nonequilibrium quasi-particle spectra in an infinite-dimensional Hubbard lattice

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dc.creatorHeary, R. J.
dc.creatorHan, J. E.
dc.date2009-04-22
dc.date.accessioned2026-07-07T13:07:20Z
dc.date.available2026-07-07T13:07:20Z
dc.descriptionA model for nonequilibrium dynamical mean-field theory is constructed for the infinite dimensional Hubbard lattice. We impose nonequilibrium by expressing the physical orbital as a superposition of a left-($L$) moving and right-($R$) moving electronic state with the respective chemical potential $μ_L$ and $μ_R$. Using the second-order iterative perturbation theory we calculate the quasi-particle properties as a function of the chemical potential bias between the $L$ and $R$ movers, i.e. $Φ= μ_L - μ_R$. The evolution of the nonequilibrium quasi-particle spectrum is mapped out as a function of the bias and temperature. The quasi-particle states with the renormalized Fermi energy scale $\varepsilon^0_{QP}$ disappear at $Φ\sim\varepsilon^0_{QP}$ in the low temperature limit. The second-order perturbation theory predicts that in the vicinity of the Mott-insulator transition at the Coulomb parameter $U=U_c$, there exists another critical Coulomb parameter $U_d$ ($<U_c$) such that, for $U_d<U<Uc$, quasi-particle states are destroyed abruptly when $(\varepsilon^0_{QP})^2\sim a(πk_BT_c)^2+ bΦ_c^2$ with the critical temperature $T_c$, the critical bias $Φ_c$ and the numerical constants $a$ and $b$ at the order of unity.
dc.identifierhttps://arxiv.org/abs/0904.3521
dc.identifierhttp://arxiv.org/abs/0904.3521
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/228058
dc.subjectStrongly Correlated Electrons
dc.titlePerturbation study of nonequilibrium quasi-particle spectra in an infinite-dimensional Hubbard lattice
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