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TT: Fachverband Tiefe Temperaturen

TT 13: Correlated Electrons: Method Development I

TT 13.8: Vortrag

Montag, 9. März 2026, 17:00–17:15, HSZ/0101

Promising properties of Ghost Gutzwiller Ansatz: from Mott insulators to correlated antiferromagnets — •Antonio Maria Tagliente¹, Michele Fabrizio¹, and Carlos Mejuto-Zaera² — ¹International School for Advanced Studies (SISSA) — ²Laboratoire de Physique Théorique, CNRS, Université de Toulouse, UPS

The ghost Gutzwiller wavefunction is a recently proposed variational Ansatz that generalizes the traditional Gutzwiller wavefunction. It consists of a Slater determinant defined in an enlarged Hilbert space that is variationally projected into the physical one. This wavefunction is therefore naturally capable of describing Hubbard bands and coexisting quasiparticle peaks.

Here, we present several results obtained through this wavefunction treated with the so-called Gutzwiller approximation.

We begin by showing that the wavefunction can describe genuine paramagnetic Mott insulators, whose finite spin susceptibility has remained elusive using other methods. A metal lead in contact with such a Mott insulator can directly reveal the spinon excitations responsible for the paramagnetic behavior, which emerge at the interface as a heavy-fermion band.

We finally demonstrate that the ghost Gutzwiller wavefunction can stabilize a correlated antiferromagnet with spin-unpolarized Hubbard bands but polarized spinons. This solution contains much more entanglement than the conventional dynamical mean-field one, and might be more representative of an actual correlated antiferromagnet in finite dimensions.

Keywords: Gutzwiller wavefunction; spinons; antiferromagnetism; Mott insulators; dynamical mean field theory