12 papers
Vanishing spin stiffness in weakly disordered two-dimensional Heisenberg ferromagnets
Jacopo Niedda, Aldo Coraggio, Giacomo Bracci-Testasecca +1
We show that a small fraction of antiferromagnetic bonds qualitatively alters the long-wavelength dynamics of two-dimensional Heisenberg ferromagnets. Although the classical ground…
Semiclassical picture of the Heisenberg spin glass in two dimensions: from weak localization to hydrodynamics
Giacomo Bracci-Testasecca, Jacopo Niedda, Aldo Coraggio +2
The two-dimensional Heisenberg spin-glass model is investigated by means of a semiclassical expansion around classical states. At leading order, we obtain an effective quadratic sp…
On the Optimal Layout of Two-Dimensional Lattices for Density Matrix Renormalization Group
A. Scardicchio
For quantum spin models defined on a two-dimensional lattice, we look for the best numbering of the lattice sites (a layout) that, at fixed bond dimension and other parameters of t…
Quantum Spin Glass in the Two-Dimensional Disordered Heisenberg Model via Foundation Neural-Network Quantum States
Luciano Loris Viteritti, Riccardo Rende, Giacomo Bracci-Testasecca +4
We investigate the two-dimensional frustrated quantum Heisenberg model with bond disorder on nearest-neighbor couplings using the recently introduced Foundation Neural-Network Quan…
Scaling theory of fading ergodicity
RafaÅ ÅwiÄtek, Miroslav Hopjan, Carlo Vanoni +2
In most noninteracting quantum systems, the scaling theory of localization predicts one-parameter scaling flow in both ergodic and localized regimes. On the other hand, it is expec…
Renormalization-Group Analysis of the Many-Body Localization Transition in the Random-Field XXZ Chain
Jacopo Niedda, Giacomo Bracci-Testasecca, Giuseppe Magnifico +3
We analyze the spectral properties of the Heisenberg spin-1/2 chain with random fields in light of recent works of the renormalization-group flow of the Anderson model in infinite…