28 citations · 44 across the 9 of their papers we have counts for
9 papers
Pointer States and Decoherence in Quantum Unitarity: Energy Conservation for Weak Interaction Model
Kentaro Urasaki
The purpose of the present paper is to derive the pointer states of a macro-object using a simple perturbation method. We study the model Hamiltonian involving the weak interaction…
Classicality in Quantum Mechanics: model for pointer states and decoherence
Kentaro Urasaki
We have studied the emergence of classical states in the perturbative interaction model. The states which interact with many other degrees of freedom, such as the center of mass of…
A General Derivation of Pointer States: Decoherence and Classicality
Kentaro Urasaki
The purpose of the present study is to derive the pointer states of a macroscopic system interacting with its environment, under the general assumptions, i.e., without assuming any…
Mixture of Quantum States: Thermal and Interaction Inducing Decoherence
Kentaro Urasaki
In this study, we show that the interaction energy plays an important role on the quantum decoherence: If we pay attention to the oscillation phase factor, …
Quantum Decoherence and Pointer Basis: Dynamics in State Vectors
Kentaro Urasaki
It is well-known that the pointer basis of a quantum system satisfies the condition to diagonalize the interaction Hamiltonian between the subsystems. We show that this condition c…
Macroscopic Reality in Quantum Mechanics; Origin and Dissipation
Kentaro Urasaki
We study the connection between dissipation and reality in macroscopic quantum systems. We present the following scenario; if we consider the dynamics of a `partial' wave function,…
Correlation Effects in Multi-Band Hubbard Model and Anomalous Properties of FeSi
Kentaro Urasaki, Tetsuro Saso
The two-band Hubbard model with the density of states obtained from the band calculation is applied for FeSi, which is suggested to be a Kondo insulator or a correlated band insula…
Correlation Effects on Optical Conductivity of FeSi
Kentaro Urasaki, Tetsuro Saso
Effects of electron correlation in FeSi are studied in terms of the two-band Hubbard model with the density of states obtained from the band calculation. Using the self-consistent…
Thermal and Dynamical Properties of the Two-band Hubbard Model Compared with FeSi
Kentaro Urasaki, Tetsuro Saso
We study the two-band Hubbard model introduced by Fu and Doniach as a model for FeSi which is suggested to be a Kondo insulator. Using the self-consistent second-order perturbation…