开放获取大势所趋。个人认为，学术期刊论坛化也是大势所趋。所以，这里公开征求对我们最近的文章的审稿意见。文章在下面的链接里。

做的东西大致如下。我们仔细考察了教材上有关费米黄金规则（fermi golden rule）的推导。发现在某些特定的情况下，可以利用sinc函数的某个数学性质。这个性质使得fermi golden rule非常自然，并且，还会导致transition probability的演化不光滑，也就是周期地存在kink。我们用非常简单的一维tight binding model来展示这一效应。

标题： Non-smooth and level-resolved dynamics of a periodically driven tight binding model

摘要： We point out that in the first order time-dependent perturbation theory, treated in every quantum mechanics textbook, the transition probability may behave non-smoothly and have kinks periodically. Moreover, its detailed temporal evolution can be sensitive to the exact locations of the eigenvalues in the continuum spectrum. Underlying this non-smooth and level resolved dynamics is a simple equality about the sinc function $\sinc x \equiv \sin x / x$. We use a one dimensional  periodically driven tight binding model to illustrate these effects, both in and outside of the perturbative regime.

ps:   刚刚获知，荷兰delft university of technology正在实验arxiv+,   也就是arxiv的改进版，主要的新加的功能就是任何读者都可以评论任何一个文章。传统的同行评议制度是该被颠覆了。