Bad metals display transport behavior that differs from what is commonly seen in ordinary metals. One of the most significant differences is a resistivity that is linear in temperature and rises to well above the Ioffe-Regel limit (where the mean-free path is equal to the lattice spacing). Using an exact Kubo formula, we show that a linear resistivity naturally occurs for many systems when they...

Wilson’s numerical renormalization group method for the calculation of dynamic properties of impurity models is generalized to investigate the effective impurity model of the dynamical mean-field theory at finite temperatures. We calculate the spectral function and self-energy for the Hubbard model on a Bethe lattice with infinite coordination number directly on the real-frequency axis and inve...

In order to investigate multipole ordering in f -electron systems from a microscopic viewpoint, we study the so-called Γ8 models on three kinds of lattices, simple cubic (sc), bcc, and fcc, based on a j-j coupling scheme with f -electron hopping integrals through (ffσ) bonding. From the Γ8 model, we derive an effective model for each lattice structure by using the second-order perturbation theo...

The influence of soft, hydration-mediated ion-ion and ion-surface interactions on the differential capacitance of an electric double layer is investigated using Monte Carlo simulations and compared to various mean-field models. We focus on a planar electrode surface at physiological concentration of monovalent ions in a uniform dielectric background. Hydration-mediated interactions are modeled ...

With the development of atomic cooling and optical lattice technology, quantum system composed ultracold gas has grown up to be a powerful tool in simulation. The pure highly controllable nature gives it strong regulatory ability. Nowadays, people can simulate more complex interesting physical phenomena, which deepens people's understanding many-body physics. In recent years, we have studied di...