24 citations · 37 across the 7 of their papers we have counts for
7 papers
Anomaly in Symplectic Integrator
Hiroto Kobayashi
Effective Liouville operators of the first- and the second-order symplectic integrators are obtained for the one-dimensional harmonic-oscillator system. The operators are defined o…
Ergodicity of Thermostat Family of Nosé--Hoover type
Hiroshi Watanabe, Hiroto Kobayashi
One-variable thermostats are studied as a generalization of the Nosé--Hoover method which is aimed to achieve Gibbs' canonical distribution with conserving the time-reversibility.…
Ergodicity of the Nosé-Hoover method
Hiroshi Watanabe, Hiroto Kobayashi
Ergodicity of the systems with Nosé-Hoover thermostat are studied. The dynamics of the heatbath variables are investigated and they can be periodic when the system has quick oscill…
Quantum Dynamics in Nanoscale Magnets in Dissipative Environments
Seiji Miyashita, Keiji Saito, Hiroto Kobayashi +1
In discrete energy structure of nanoscale magnets, nonadiabatic transitions at avoided level crossings lead to fundamental processes of dynamics of magnetizations. The thermal envi…
Parity Effect in the Resonant Tunneling
Seiji Miyashita, Keiji Saito, Hiroto Kobayashi
A mechanism of the parity effect in the thermally assisted resonant tunneling is proposed in the view point of nonadiabatic transitions of thermally excited states. In this mechani…
Comment on ``A simple expression for the terms in the Baker-Campbell-Hausdorff series''
Hiroto Kobayashi
It is pointed out that Reinsch's matrix operation formulation of calculating the Baker-Campbell-Hausdorff series [math-ph/9905012] is equivalent to the straightforward series expan…