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高等学校化学学报

一维中心势V(q)=Bq2+A/q2(A, B>0)中运动的粒子在量子相空间表示中的解

隗功民, 吕立强, 李前树

Published Apr 10, 2006• 0 citations
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一维中心势V(q)=Bq^2+A/q^2(A,B>0)中运动的粒子在量子相空间表示中的精确解

隗功民, 吕立强, 李前树

在Torres-Vega和Frederick(T-F)量子相空间理论的框架下,求解了相空间中一维中心势场V(q)=Bq^2+A/q^2(A,B>0)中运动的单粒子的本征函数,并对相空间中的概率密度函数进行了讨论.

高等学校化学学报•Jan 1, 2006•0 citations
We study the effect of increasing the range of interactions on phonon relaxation in a chain of atoms with quartic anharmonicity. The study is motivated by recent numerical studies, showing that the value of the exponent alpha characterizing the divergence of conductivity with system size apparently depends on the presence of second neighbor couplings. We perform a quantum calculation of the wave-vector (q) dependent relaxation rate gamma(q) in the second order perturbation theory. The nonanalytic dependence of gamma(q) arises due to small-q singularity of the collision integral. We find that gamma(q) proportional to Aq(5/3) + Bq2. This gives rise to an asymptotic value alpha = 0.4, but the q2 terms lead to a higher apparent value of alpha at small sizes of the chain.