通过短时测量的势垒分类
Potential Barrier Classification by Short-Time Measurement
摘要：
本文研究了初始受限波包上δ函数势垒的短时动力学。主要有两个结论：A）在短时间内，通过屏障的第一颗粒的概率密度不受其影响。B）当屏障是吸收性的（即，它的电势是虚的）它在比真实势垒更短的时间内影响透射波函数。因此，可以通过仅在短时间内测量其对透射波函数的影响来区分虚势垒和实势垒。
英文摘要：
We investigate the short-time dynamics of a delta-function potential barrier on an initially confined wave-packet. There are mainly two conclusions: A) At short times the probability density of the first particles that passed through the barrier is unaffected by it. B) When the barrier is absorptive (i.e., its potential is imaginary) it affects the transmitted wave function at shorter times than a real potential barrier. Therefore, it is possible to distinguish between an imaginary and a real potential barrier by measuring its effect at short times only on the transmitting wavefunction.
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