Transport in open spin chains : a Monte Carlo wave - function approach
نویسندگان
چکیده
We investigate energy transport in several two-level atom or spin-1/2 models by a direct coupling to heat baths of different temperatures. The analysis is carried out on the basis of a recently derived quantummaster equation which describes the nonequilibrium properties of internally weakly coupled systems appropriately. For the computation of the stationary state of the dynamical equations, we employ a Monte Carlo wave-function approach. The analysis directly indicates normal diffusive or ballistic transport in finite models and hints toward an extrapolation of the transport behavior of infinite models.
منابع مشابه
Sensitivity Analysis of a Wideband Backward-wave Directional Coupler Using Neural Network and Monte Carlo Method (RESEARCH NOTE)
In this paper sensitivity analysis of a wideband backward-wave directional coupler due to fabrication imperfections is done using Monte Carlo method. For using this method, a random stochastic process with Gaussian distribution by 0 average and 0.1 standard deviation is added to the different geometrical parameters of the coupler and the frequency response of the coupler is estimated. The appli...
متن کاملGiant, voltage-actuated deformation of a dielectric elastomer under dead load
Related Articles A new numerical approach to dense polymer brushes and surface instabilities J. Chem. Phys. 136, 044903 (2012) Modifying thermal transport in electrically conducting polymers: Effects of stretching and combining polymer chains J. Chem. Phys. 136, 044901 (2012) Note: Percolation in two-dimensional flexible chains systems J. Chem. Phys. 136, 046101 (2012) Microstructure, transport...
متن کاملSpin contamination in quantum Monte Carlo wave functions
The wave function usually employed in quantum Monte Carlo ~QMC! electronic structure calculations is the product of a Jastrow factor and a sum of products of up-spin and down-spin determinants. Typically, a different Jastrow factor is used for paralleland antiparallel-spin electrons in order to satisfy the cusp conditions and thereby ensure that the local energy at electron– electron coincidenc...
متن کاملM ay 1 99 9 Spin dynamics simulation of the three - dimensional XY model : Structure factor and transport properties
We present extensive Monte-Carlo spin dynamics simulations of the classical XY model in three dimensions on a simple cubic lattice with periodic boundary conditions. A recently developed efficient integration algorithm for the equations of motion is used, which allows a substantial improvement of statistics and large integration times. We find spin wave peaks in a wide range around the critical...
متن کاملSpin Density Distribution in Open-Shell Transition Metal Systems: A Comparative Post-Hartree-Fock, Density Functional Theory, and Quantum Monte Carlo Study of the CuCl2 Molecule.
We present a comparative study of the spatial distribution of the spin density of the ground state of CuCl2 using Density Functional Theory (DFT), quantum Monte Carlo (QMC), and post-Hartree-Fock wave function theory (WFT). A number of studies have shown that an accurate description of the electronic structure of the lowest-lying states of this molecule is particularly challenging due to the in...
متن کامل