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5 papers · 1 filter
Dynamics of the Density Matrix in Contact with a Thermal Bath and the Quantum Master Equation
Takashi Mori, Seiji Miyashita
We study the structure of the time evolution of the density matrix in contact with a thermal bath in a standard projection operator sheme. The reduced density matrix of the system…
Variational Monte Carlo Study of Electron Differentiation around Mott Transition
Daisuke Tahara, Masatoshi Imada
We study ground-state properties of the two-dimensional Hubbard model at half filling by improving variational Monte Carlo method and by implementing quantum-number projection and…
Electronic Structure and Electron Correlation in LaFeAsO_{1-x}F_x and LaFePO_{1-x}F_x
Walid Malaeb, Teppei Yoshida, Takashi Kataoka +10
Photoemission spectroscopy is used to investigate the electronic structure of the newly discovered iron-based superconductors LaFeAsO_{1-x}F_x and LaFePO_{1-x}F_x. Line shapes of t…
Ab initio Derivation of Low-energy Model for Iron-Based Superconductors LaFeAsO and LaFePO
Kazuma Nakamura, Ryotaro Arita, Masatoshi Imada
Effective Hamiltonians for LaFeAsO and LaFePO are derived from the downfolding scheme based on first-principles calculations and provide insights for newly discovered superconducti…
Variational Monte Carlo Method Combined with Quantum-Number Projection and Multi-Variable Optimization
Daisuke Tahara, Masatoshi Imada
Variational wave functions used in the variational Monte Carlo (VMC) method are extensively improved to overcome the biases coming from the assumed variational form of the wave fun…