A5074528594- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
Max Planck Institute for Solid State Research
2023
Nanjing University
2017
Nanjing Xiaozhuang University
2017
Two-dimensional Hubbard lattices with two or three holes are investigated as a function of $U$ in the large-$U$ limit. In so-called Nagaoka limit (one-hole system at infinite $U$), it is known that model exhibits ferromagnetic ground state. Here, by means exact full configuration interaction quantum Monte Carlo simulations applied to periodic up 24 sites, we compute spin-spin correlation functions increasing $U$. The clearly demonstrate onset domains, centered on individual holes. overall...
To validate the ability of full configuration interaction quantum Monte Carlo (FCIQMC) for studying 2D Hubbard model near half-filling regime, ground state energies a 4 × square lattice system with various strengths are calculated. It is found that calculated results in good agreement those obtained by exact diagonalization (i.e., values given basis set) when population psi particles (psips) higher than critical required to correctly sample wave function. In addition, variations average...