correlated electron systems: challenges and future
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Correlated Electron Systems: Challenges and Future. Gabriel Kotliar Rutgers University. What do we want from materials theory?. New concepts , qualitative ideas Understanding, explanation of existent experiments, and predictions of new ones. Quantitative capabilities with predictive power. - PowerPoint PPT PresentationTRANSCRIPT
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Correlated Electron Systems: Challenges and Future
Gabriel Kotliar
Rutgers University
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What do we want from materials theory?
• New concepts , qualitative ideas
• Understanding, explanation of existent experiments, and predictions of new ones.
• Quantitative capabilities with predictive
power.
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Materials Theory
a) System specific properties.
b) General principles, universal features.
• Qualitative insights, quantitative techniques, analytical and computational.
• Development of methods and algorithms, and study of system specific applications.
Balanced Approach
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Mott transition and superexchange
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Mott transition in V2O3 under pressure or chemical substitution on V-site
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Phase Diagram k Organics
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Mott transition in layered organic conductors S Lefebvre et al.
cond-mat/0004455, Phys. Rev. Lett. 85, 5420 (2000)
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Failure of the Standard Model: NiSe2-xSxMiyasaka and
Takagi (2000)
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Failure of the Standard Model: NiSe2-xSx
Miyasaka and Takagi (2000)
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Failure of the Standard Model: NiSe2-xSxMiyasaka and
Takagi (2000)
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Anomalous Resistivity and Mott transition Ni Se2-x Sx
Insights from DMFT: think in term of spectral functions (branch cuts) instead of well defined QP (poles )
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Evolution of the Spectral Function
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Double Occupancy vs U
• CDMFT Parcollet, Biroli GK
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Pressure Driven Mott transition
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Failure of the Standard Model: NiSe2-xSxMiyasaka and
Takagi (2000)
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Transport in k organics
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Ising critical endpoint! In V2O3
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Mott transition in CDMFT
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Strong frustration limit.
Anomalous transfer of spectral weight connected to the proximity to the Ising Mott endpoint (Kotliar Lange and Rozenberg Phys. Rev. Lett. 84, 5180 (2000)
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