玻色凝聚激发的反射和折射
Reflection and Refraction of Bose-condensate Excitations
摘要：
本文研究了玻色凝聚激发在低能极限下穿过分隔两个不同密度凝聚体的势垒的透射和反射。在低能量极限的Bogoliubov激发的入射角发生完美的传输。这个条件对应于电磁波的布鲁斯特定律。Bogoliubov激发的全内反射被发现发生在一个大的入射角在低能量极限。Kagan等人命名的反常隧穿[Yu. Kagan等人，物理学评论快报，90，130402（2003）]可以根据阻抗匹配来理解。在垂直入射的情况下，与Tomonaga-Luttinger液体的结果进行了比较。
英文摘要：
We investigate the transmission and reflection of Bose-condensate excitations in the low energy limit across a potential barrier separating two condensates with different densities. The Bogoliubov excitation in the low energy limit has the incident angle where the perfect transmission occurs. This condition corresponds to the Brewster's law for the electromagnetic wave. The total internal reflection of the Bogoliubov excitation is found to occur at a large incident angle in the low energy limit. The anomalous tunneling named by Kagan et al. [Yu. Kagan et al., Phys. Rev. Lett., 90, 130402 (2003)] can be understood in terms of the impedance matching. In the case of the normal incidence, comparison with the results in Tomonaga-Luttinger liquids is made.
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