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Searching for spin-liquids and non-Fermi liquids in quantum strongly correlated systems.

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Presentation on theme: "Searching for spin-liquids and non-Fermi liquids in quantum strongly correlated systems."— Presentation transcript:

1 Searching for spin-liquids and non-Fermi liquids in quantum strongly correlated systems

2 Spin systems Geometry (+ Disorder) Frustration Exotic ordered ground-state: The spin-glass state Temperature melts the ordered state Quantum Can quantum fluctuations “melt” the SG state even at T=0? Spin fluid state?

3 Basic frustrated model: archetypal SG, the SK model Random J ij  quantum spin glass model Positive J ij + kagome lattice  quantum spin fluid model ?

4 The classic “ best ” candidate for a quantum spin fluid (1988) SCGO: double layer kagome spins 3/2

5 New “ best ” candidate for spin fluid system Paractamite ZnCu3(OH)6Cl2 is the observed experimental behavior intrinsic of a kagome lattice?

6 Some recent results 12 sites tiling w/2 spin-holes NMR Olariu et al PRL (2008)

7 The classic example: Mott transition in V 2 O 3 McWhan et al PRB ’71 ‘73 T pressure or chemical substitution

8 Analogy between DMFT and conventional MFT

9 k-resolved A(w) k   insulator metal 

10 Takizawa, Fujimori, Sordi, MR Prediction of Hubbard bands in SrVO3

11 Novel NFL phase in the Periodic Anderson model FL MAG QCP NFL T Mott


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