IV) Materials calculations with dynamical mean field theory (DMFT)

IV) Materials calculations with dynamical mean field theory (DMFT) IV) Materials calculations with dynamical mean field theory (DMFT)

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10.07.2015 Views

Numerical results – spectrumSpectrum A(ω) = − 1 π ImG(ω)U=0.8 U=1.2U=2.8 U=3.6 U=4.4 U=5.2U=5.8 U=6 U=5.6DMFT(NRG) Bulla’99Quasiparticle weightDMFT(PQMC) Feldbacher, kh, Assaad’04Α(ω)−8 −4 0 4 8ωMetal – Fermi liquidΣ(ω) = (1 − 1 Z )ω − iBω2 + O(ω 3 )m ∗m = 1 Z = 1 − ∂ReΣ(ω+i0+ ) ∣∂ωA(0) fixed∣ω=0

Numerical results – spectrumSpectrum A(ω) = − 1 π ImG(ω)U=0.8 U=1.2U=2.8 U=3.6 U=4.4 U=5.2U=5.8 U=6 U=5.6DMFT(NRG) Bulla’99Quasiparticle weightDMFT(PQMC) Feldbacher, kh, Assaad’04Α(ω)−8 −4 0 4 8ωMetal – Fermi liquidΣ(ω) = (1 − 1 Z )ω − iBω2 + O(ω 3 )m ∗m = 1 Z = 1 − ∂ReΣ(ω+i0+ ) ∣∂ωA(0) fixed∣ω=0Insulator – Mott-HubbardΣ(ω) = 1 U 24 ωG(ω) =Z= 1 2ZdɛdɛN(ɛ)ω − ɛ − Σ(ω)N(ɛ)ω − ɛ − U/2 +N(ɛ)ω − ɛ + U/2

Numerical results – spectrumSpectrum A(ω) = − 1 π ImG(ω)U=0.8 U=1.2U=2.8 U=3.6 U=4.4 U=5.2U=5.8 U=6 U=5.6<strong>DMFT</strong>(NRG) Bulla’99Quasiparticle weight<strong>DMFT</strong>(PQMC) Feldbacher, kh, Assaad’04Α(ω)−8 −4 0 4 8ωMetal – Fermi liquidΣ(ω) = (1 − 1 Z )ω − iBω2 + O(ω 3 )m ∗m = 1 Z = 1 − ∂ReΣ(ω+i0+ ) ∣∂ωA(0) fixed∣ω=0Insulator – Mott-HubbardΣ(ω) = 1 U 24 ωG(ω) =Z= 1 2ZdɛdɛN(ɛ)ω − ɛ − Σ(ω)N(ɛ)ω − ɛ − U/2 +N(ɛ)ω − ɛ + U/2

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