# Treatment of broadening in Monte Carlo calculations of quantum transport

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A statistical sampling method is proposed for computing oscillatory integrals associated with the semiclassical initial value representation. The semiclassical expression is rewritten as an integral over a phase distribution P(s). The phase distribution is obtained from Metropolis sampling of...

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The two-dimensional (2D) Heisenberg model with anisotropic exchange (Î” = 1 - J[sub x]/J[sub z]) and S = 1/2 is investigated by the quantum Monte Carlo method. The energy, susceptibility, specific heat, spin-spin correlation functions, and correlation radius are calculated. The sublattice...

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Examines the integral method which utilizes time quantum Monte Carlo data for finite temperature quantum dynamics. Basis of the integral method from the maximum entropy method; Application of the method for spectral density calculation; Relevance of the short-time real time data on spectral...

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The spin-boson model is solved within the framework of quantum-classical dynamics using our recently-developed surface-hopping scheme. The quantum-classical equation of motion is expressed in an adiabatic basis and its solution is constructed from an ensemble of trajectories which undergo...

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A simple Monte Carlo (MC) method is introduced to treat the quantum-mechanical hard-sphere fluid. It uses the relative two-body Slater sum (instead of the classical Boltzmann factor) as a quantum-mechanical probability in the relative two-body configurational space. The MC calculations have been...

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We consider in the present paper an extension of numerical path integral methods for use in computing finite temperature time correlation functions. We demonstrate that coordinate rotation techniques extend appreciably the time domain over which Monte Carlo methods are of use in the construction...