Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: (General) Theory 2
TT 80.1: Vortrag
Donnerstag, 10. März 2016, 16:00–16:15, H18
A novel solution of the Hubbard model: a generalized equation-of-motion approach to the underdoped cuprates puzzle — •Andrea Di Ciolo1 and Adolfo Avella1,2 — 1Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, I-84084 Fisciano (SA), Italy — 2CNR-SPIN, UoS di Salerno, I-84084 Fisciano (SA), Italy
We solve the Hubbard model on a d-dimensional hypercubic lattice in the framework of the Composite Operator Method (COM) within a 4-pole approximation. This approach extends the 2-pole [1] and the 3-pole [2] schemes treating on equal footing both U and J scales of energy. The COM, which is based on the Green’s function formalism, is highly tunable and expressly devised for the characterization of strongly correlated electronic states and the exploration of novel emergent phases. Motivated by the long-standing experimental challenge posed by the puzzling spectral properties of the underdoped cuprates, we adopt a basis of fields containing operators specifically designed to describe Hubbard electronic transitions dressed by nearest-neighbor spin fluctuations and to capture the effects of these latter on all electronic properties. The spin fluctuations play a crucial role in the mechanism of pseudogap formation and evolution as well as in the unconventional behavior of the Fermi surface, the spectral weights and the electronic dispersion. Thus, we exploit this non canonical, but very efficient, operatorial representation of correlated electrons to achieve a deeper understanding of the underdoped phase of cuprates.
F. Mancini, and A. Avella, Adv. Phys. 53, 537 (2004)
A. Avella, Eur. Phys. J. B 87, 45 (2014)