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Chain structure of liquid and amorphous selenium: tight-binding molecular-dynamics simulation

机译:液态和非晶态硒的链结构:紧密结合的分子动力学模拟

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Thight-binding molecular-dynamics (TB-MD) simulation has been performed to study the properties on the microscopic scale of liquid and amorphous selenium at 375 and 760 K. Since a diagonalization of the tight-binding (TB) Hamiltonian matrix is time consuming calculation, we have made parallel computations in the simulation program to realize a long time simulation of 512 atoms up to the 10~5 time steps corresponding to the order of 10 ps. The result shows that the radial distribution function, which becomes zero at around 0.275 nm, agrees with experiments and the dihedral angle distribution function has a maximum around 0 deg, a minimum at 30 deg and a smaller maximum around 100 deg. This tendency differs from a previous study either by the tight-binding Monte Carlo (TB-MC) simulation or by the first principle molecular-dynamics (MD) simulation.
机译:进行了束缚分子动力学(TB-MD)模拟,以研究液态和无定形硒在375和760 K时的微观尺度性质。由于紧密束缚(TB)哈密顿矩阵的对角化非常耗时在计算程序中,我们在仿真程序中进行了并行计算,以实现512个原子的长时间仿真,仿真时间长达10到5个时间步长,对应于10 ps的数量级。结果表明,径向分布函数在0.275 nm附近变为零,与实验一致,二面角分布函数在0度附近具有最大值,在30度处具有最小值,而在100度附近具有较小的最大值。这种趋势与以前的研究有所不同,无论是紧密结合的蒙特卡洛(TB-MC)模拟还是第一原理分子动力学(MD)模拟。

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