Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-02-14
Physical Review Letters 107, 056403 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
Published version, 3 figures; Published July 29, 2011
Scientific paper
10.1103/PhysRevLett.107.056403
We present the theory of an extremely correlated Fermi liquid (ECFL) with $U\to \infty$. This liquid has an underlying Fermi liquid (FL) Greens function that is further caparisoned. The theory leads to two parallel hierarchies of equations that permit iterative approximations in a certain parameter. Preliminary results for the spectral functions display a broad background and a distinct $T$ dependent left skew. An important energy scale $\Delta(\vec{k},x)$ emerges as the average inelasticity of the FL Greens function, and influences the photoemission spectra profoundly. A duality is identified wherein an apparent loss of coherence of the ECFL results from an excessively sharp FL.
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