电子在氦原子上的非指数隧穿和Fano共振对微波吸收线型的控制
Non-exponential tunneling and control of microwave absorption lineshapes via Fano resonance for electrons on Helium
摘要：
本文研究了在垂直磁场中，氦表面上的电子在面内小磁场作用下的运动。某些被束缚在氦表面的状态然后溶解到连续谱中，变成长寿命的共振。因此，微波吸收线获得不对称的Fano线型，其可通过改变微波极化或面内磁场来调谐。被困在以前束缚态的电子将从氦表面隧穿;我们表明，在适当的情况下，这种“放射性衰变”可以表现出阻尼振荡，而不是简单的指数衰变。振荡指数衰减的机制并不特定于氦上的电子，这种效应也可能与物理学中的其他地方有关。
英文摘要：
We consider the application of a small in-plane magnetic field to electrons on a helium surface in a perpendicular magnetic field. Certain states that were bound to the helium surface then dissolve into the continuum turning into long-lived resonances. As a result microwave absorption lines acquire an asymmetric Fano lineshape that is tunable by varying the microwave polarisation or the in-plane magnetic field. Electrons trapped in a formerly bound state will tunnel off the surface of helium; we show that under suitable circumstances this ``radioactive decay'' can show damped oscillations rather than a simple exponential decay. The mechanism for oscillatory exponential decay is not specific to electrons on Helium and this effect may also be relevant elsewhere in physics.
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