Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Properties and Electronic Structure
TT 14.6: Vortrag
Montag, 9. März 2026, 16:15–16:30, HSZ/0103
Signatures of the Fermi surface reconstruction of a doped Mott insulator in a slab geometry — •Gregorio Staffieri and Michele Fabrizio — International School for Advanced Studies (SISSA), Via Bonomea 265, I-34136 Trieste, Italy
In the underdoped regime of high-Tc superconductors, the Fermi surface consists of small pockets coexisting with a pseudogap at the antinodal points, while in the overdoped regime it becomes large and electron-like. Evidence for this doping-driven reconstruction has been found in the two-dimensional single-band Hubbard model using various numerical methods.
We study the reconstruction of the Fermi surface in a hole-doped Mott insulator with slab geometry using the Dynamical Cluster Approximation (DCA). We show that enhanced correlations at the surface lead to a strong layer dependence of the Fermi surface: hole-like pockets appear in the superficial layers and gradually evolve into a single electron-like surface in the innermost layers. We also investigate Friedel oscillations induced by the surface as a function of hole doping and identify clear signatures of the reconstruction in their periodicity. In addition, we introduce a computationally tractable quantity that diagnoses the same variation through a concurrent breakdown of Luttinger’s theorem. Together, these observables provide reliable indicators of Fermi surface topology without requiring momentum-space periodization.
Keywords: Fermi surface reconstruction; Friedel oscillations; Fermi pockets; open boundary conditions